# LogicCommons

> A commons of trustworthy calculators — each computed live by a reviewed spreadsheet model, with its methodology, provenance and sources on the page.

Calculators are available as web pages and programmatically over the Model Context Protocol (MCP).

## MCP
- Endpoint (Streamable HTTP): https://mcp.logiccommons.com/mcp
- Meta-tools: search_calculators, get_calculator_schema, run_calculator
- Every response carries trust metadata (platform version, interface version, last-updated, citation URL).
- get_calculator_schema and run_calculator accept optional platform_version to pin an immutable historical version.

## Categories
- [Air Emissions & Gas](https://www.logiccommons.com/category/air-emissions-gas)
- [Assessments](https://www.logiccommons.com/category/assessments)
- [Construction](https://www.logiccommons.com/category/construction)
- [Corporate Finance, Forecasting & Valuation](https://www.logiccommons.com/category/corporate-finance,-forecasting-&-valuation)
- [Electrical](https://www.logiccommons.com/category/electrical)
- [Geotechnical](https://www.logiccommons.com/category/geotechnical)
- [Heat Transfer & Thermal](https://www.logiccommons.com/category/heat-transfer-thermal)
- [Home Projects Engineering](https://www.logiccommons.com/category/home-projects-engineering)
- [HVAC & Energy](https://www.logiccommons.com/category/hvac-energy)
- [Occupational Health and Ergonomics](https://www.logiccommons.com/category/occupational-health-and-ergonomics)
- [Personal Finance](https://www.logiccommons.com/category/personal-finance)
- [Personal Investing](https://www.logiccommons.com/category/personal-investing)
- [Plumbing & Piping](https://www.logiccommons.com/category/plumbing-piping)
- [Project Finance & Infrastructure Investment](https://www.logiccommons.com/category/project-finance-&-infrastructure-investment)
- [Quality & Six Sigma](https://www.logiccommons.com/category/quality-six-sigma)
- [Reliability and Maintenance Engineering](https://www.logiccommons.com/category/reliability-and-maintenance-engineering)
- [Rotating Equipment & Drives](https://www.logiccommons.com/category/rotating-equipment-drives)
- [Structural & Civil](https://www.logiccommons.com/category/structural-civil)
- [Supply Chain](https://www.logiccommons.com/category/supply-chain)
- [Treasury, Fixed Income & Financial Risk](https://www.logiccommons.com/category/treasury,-fixed-income-&-financial-risk)
- [Water & Wastewater](https://www.logiccommons.com/category/water-wastewater)

## Calculators
- [Acceptance Sampling Calculator](https://www.logiccommons.com/calculators/acceptance-sampling-calculator): Builds a binomial acceptance-sampling plan with its operating characteristic curve, producer and consumer risks and average outgoing quality. Use it to design…
- [Activated Sludge FM Ratio Calculator](https://www.logiccommons.com/calculators/activated-sludge-fm-ratio-calculator): Calculates daily BOD5, CBOD5, or COD loading divided by active MLVSS inventory derived from volume and MLVSS, volume and MLSS with a volatile fraction, or a di…
- [Airborne Contaminant TWA Ceiling Calculator](https://www.logiccommons.com/calculators/airborne-contaminant-twa-ceiling-calculator): Combines concentration-duration entries into an actual-shift average, reference-period equivalent, entered-limit ratios, and a separate ceiling screen without…
- [Airflow Distribution Calculator](https://www.logiccommons.com/calculators/airflow-distribution-calculator): Distributes a system's airflow room by room from each room's load and sizes the registers. Use it to balance supply airflow across a home.
- [Annuity Income Estimator Calculator](https://www.logiccommons.com/calculators/annuity-income-estimator-calculator): Estimates the annual and monthly income a lump sum buys over a fixed term at an assumed interest rate, with payments at the start or the end of each year and a…
- [Area Calculator](https://www.logiccommons.com/calculators/area-calculator) (web page only; not available over MCP): Draw an ordered outline on FloorCanvas, add up to five optional exclusion polygons, and calculate gross, excluded, and net area in one US/Metric app. Canvas ed…
- [Arrhenius Accelerated Life Calculator](https://www.logiccommons.com/calculators/arrhenius-accelerated-life-calculator): Projects an entered test-condition life parameter to a use temperature with the Arrhenius acceleration model and an exponential or Weibull life distribution.
- [Asphalt Tonnage Calculator](https://www.logiccommons.com/calculators/asphalt-tonnage-calculator): Computes asphalt tonnage from paved area, thickness and mix density, with waste and whole-load ordering. Use it to order paving material.
- [Assembly R Value Whole Wall Calculator](https://www.logiccommons.com/calculators/assembly-r-value-whole-wall-calculator): Builds two transparent parallel heat-flow paths from a complete layer schedule, reports cavity, framing, and whole-wall thermal resistance, and optionally scre…
- [Asset Allocation Rebalancing Calculator](https://www.logiccommons.com/calculators/asset-allocation-rebalancing-calculator): Works out what to trade to bring a portfolio back to its target weights, and answers two further questions: whether the drift is far enough past your tolerance…
- [Auto Loan Payment Calculator](https://www.logiccommons.com/calculators/auto-loan-payment-calculator): Works out the monthly payment on a car loan built from the whole deal: the sales tax charged under your state's own rules for a trade-in and a rebate, dealer a…
- [Balance Transfer Break Even Calculator](https://www.logiccommons.com/calculators/balance-transfer-break-even-calculator): Prices a credit card balance transfer against staying where you are: the interest each card charges over the whole payoff, the fee the new card takes, what the…
- [Baseboard Casing Calculator](https://www.logiccommons.com/calculators/baseboard-casing-calculator) (web page only; not available over MCP): Draw a floor plan on FloorCanvas with its rooms, windows and doors, set the wall height and each opening's height on the drawing or in the tables under it (and…
- [Battery Sizing Calculator](https://www.logiccommons.com/calculators/battery-sizing-calculator): Sizes an off-grid or backup battery bank from the load, autonomy, depth of discharge, round-trip efficiency and temperature derate. Use it to specify a battery…
- [Beam Deflection Calculator](https://www.logiccommons.com/calculators/beam-deflection-calculator): Computes deflection, moment and shear for a simply supported or cantilever beam under point and distributed loads, with span-over-deflection checks. Use it for…
- [Bearing Capacity Calculator](https://www.logiccommons.com/calculators/bearing-capacity-calculator): Computes ultimate and allowable bearing capacity of a shallow footing from derived bearing-capacity factors and a factor of safety. Use it for a first-pass fou…
- [Belt Pulley Drive Performance Calculator](https://www.logiccommons.com/calculators/belt-pulley-drive-performance-calculator): Rates an open-belt drive from its pitch diameters: ideal and actual speed ratio under an entered driven-speed loss, belt speed, approximate belt length and sma…
- [Bid Comparison Change Order Calculator](https://www.logiccommons.com/calculators/bid-comparison-change-order-calculator): Compare bids on the same scope of work. Each bid's price plus your allowance for every item it leaves out gives its normalized price; the bids are ranked by no…
- [Bid Evaluation Matrix](https://www.logiccommons.com/calculators/bid-evaluation-matrix): Ranks competing bids by weighted score across your criteria, with a robustness check on the weights. Use it to support a procurement decision.
- [Bond Price Yield Duration Convexity Calculator](https://www.logiccommons.com/calculators/bond-price-yield-duration-convexity-calculator): Prices a synthetic fixed-rate bullet bond from yield or solves yield from an observed dirty price, then exposes coupon cash flows, duration, convexity, dollar…
- [Budget 50 30 20 Calculator](https://www.logiccommons.com/calculators/budget-50-30-20-calculator): Sorts a household's own monthly spending lines into needs, wants and savings and sets each against the 50/30/20 rule, on an income counted the way the rule's a…
- [Buy Now vs Save and Pay Cash Calculator](https://www.logiccommons.com/calculators/buy-now-vs-save-and-pay-cash-calculator): Compares financing a purchase now with setting the same monthly budget aside and paying cash later, once the savings meet the price of that month, which rises…
- [Capital Budgeting Replacement Real Option Calculator](https://www.logiccommons.com/calculators/capital-budgeting-replacement-real-option-calculator): Compares a synthetic replacement asset with the existing asset through incremental after-tax cash flows, calculates NPV and periodic IRR, and adds a probabilit…
- [Capital Gains Tax Calculator](https://www.logiccommons.com/calculators/capital-gains-tax-calculator): Works out the federal tax on one sale by stacking the gain on top of your other taxable income and charging each rate layer it reaches at that layer's own rate…
- [Car Lease vs Buy Calculator](https://www.logiccommons.com/calculators/car-lease-vs-buy-calculator): Prices leasing a car and buying the same car over the years you would keep it: the lease by the Federal Reserve's formula, with your state's own lease-tax meth…
- [Charitable Giving Bunching Calculator](https://www.logiccommons.com/calculators/charitable-giving-bunching-calculator): Prices giving the same amount to charity every year against giving several years of it at once, under the 2026 rules: the half-percent-of-income floor that is…
- [Chemical Dose Feed Rate Calculator](https://www.logiccommons.com/calculators/chemical-dose-feed-rate-calculator): Calculates required dry or liquid chemical feed from flow and target dose, or back-calculates achieved dose from an actual feeder rate, with optional user-ente…
- [Childcare vs Second Income Calculator](https://www.logiccommons.com/calculators/childcare-vs-second-income-calculator): Judges a second income on what it actually leaves after the taxes it alone attracts, the childcare it makes necessary and the costs of going to work, with the…
- [Chlorine CT Contact Time Calculator](https://www.logiccommons.com/calculators/chlorine-ct-contact-time-calculator): Calculates achieved chlorine CT from a minimum residual and direct or process-unit T10, solves the T10 required for a user-entered CT target, or sizes a minimu…
- [Circuit Load Panel Capacity Calculator](https://www.logiccommons.com/calculators/circuit-load-panel-capacity-calculator): Builds a fixed split-phase circuit schedule, separates continuous and noncontinuous current, applies a transparent 125 percent planning multiplier, routes each…
- [Clarifier Surface Solids Loading Calculator](https://www.logiccommons.com/calculators/clarifier-surface-solids-loading-calculator): Calculates surface overflow rate and solids loading rate for in-service clarifiers using explicit geometry, flow, unit-system, and solids-stream choices.
- [Closing Costs Estimator](https://www.logiccommons.com/calculators/closing-costs-estimator): Itemises what you will be asked to pay at closing, separated into lender fees, third-party fees and prepaid items, and adds the down payment to give the cash y…
- [College Savings 529 Planner Calculator](https://www.logiccommons.com/calculators/college-savings-529-planner-calculator): Prices every year of study at the price it will actually be paid at rather than multiplying one inflated year, projects a 529 account forward to the day study…
- [Comparable Company Precedent Transaction Valuation Calculator](https://www.logiccommons.com/calculators/comparable-company-precedent-transaction-valuation-calculator): Applies a user-selected mean, median, or inclusive percentile of synthetic or user-entered trading-comparable or precedent-transaction multiples to a target op…
- [Composite Section Calculator](https://www.logiccommons.com/calculators/composite-section-calculator): Draw a cross-section, or send its outline and up to five inclusions as rows in FEET (US) or METRES (Metric), not inches, with Y running down; give each inclusi…
- [Composite Wall Thermal Resistance Heat Loss Calculator](https://www.logiccommons.com/calculators/composite-wall-thermal-resistance-heat-loss-calculator): Calculates steady one-dimensional heat flux and heat rate through a constant-area plane wall of up to six user-entered layers in series. It can use known wall-…
- [Compound Interest Growth Calculator](https://www.logiccommons.com/calculators/compound-interest-growth-calculator): Projects a balance forward at a rate you quote, adding the interest as often as the account really adds it, from once a year to continuously, and reports the e…
- [Concrete Volume and Bags](https://www.logiccommons.com/calculators/concrete-slab-footing-estimator-calculator): Estimate the concrete for slabs, strip footings, pads, piers, walls and solid stairs typed as element rows, or draw a slab on the page's drawing grid, exclude…
- [Condensation Dew Point Risk Calculator](https://www.logiccommons.com/calculators/condensation-dew-point-risk-calculator): Calculates interior and exterior dew points with the Magnus relation, maps a steady-state temperature gradient through a complete assembly, and identifies the…
- [Conduit Fill Calculator](https://www.logiccommons.com/calculators/conduit-fill-calculator): Computes conduit fill from the conductors you enter against the 53, 31 and 40 percent limits, and recommends the smallest trade size that fits. Use it to check…
- [Consolidation Settlement Calculator](https://www.logiccommons.com/calculators/consolidation-settlement-calculator): Computes primary consolidation settlement and the time rate from soil compressibility and the stress increase. Use it to estimate foundation settlement.
- [Construction Draw Interest During Construction Calculator](https://www.logiccommons.com/calculators/construction-draw-interest-during-construction-calculator): Builds an eight-period construction draw schedule with selectable debt/equity priority, debt eligibility, beginning or average debt interest basis, day-count c…
- [Control Chart Calculator](https://www.logiccommons.com/calculators/control-chart-calculator): Computes X-bar and R control limits from your subgroups using derived control-chart constants, and flags out-of-control points. Use it to set up a control char…
- [Cost of Living Comparison Calculator](https://www.logiccommons.com/calculators/cost-of-living-comparison-calculator): Compares the cost of living in two states with the federal government's own regional price parities, and gives the salary that keeps the same standard of livin…
- [Cost of Raising a Child Calculator](https://www.logiccommons.com/calculators/cost-of-raising-a-child-calculator): Rebuilds what one child costs from the age you enter through 17 out of the published survey's own parts, the age band, the household income group, the region a…
- [Cost Per Square Foot Estimator](https://www.logiccommons.com/calculators/cost-per-square-foot-estimator) (web page only; not available over MCP): Estimate finish costs from a floor plan you draw: flooring, trim along the outline, wall finishes at your wall height, and doors and windows, each at your own…
- [Credit Card Payoff Calculator](https://www.logiccommons.com/calculators/credit-card-payoff-calculator): Runs a credit card balance to zero twice, once at a fixed monthly payment you choose and once at the issuer minimum stated the way the large issuers state it,…
- [Crypto DCA Cost Basis Calculator](https://www.logiccommons.com/calculators/crypto-dca-cost-basis-calculator): Enter your crypto purchases and the price today, and see your average cost, the units you hold, your gain or loss and how much of it is on purchases held more…
- [Debt Consolidation Comparison Calculator](https://www.logiccommons.com/calculators/debt-consolidation-comparison-calculator): Prices your debts as they stand against one consolidation loan, month by month, with the origination fee counted and the whole life of both routes compared. It…
- [Debt Payoff Avalanche vs Snowball Calculator](https://www.logiccommons.com/calculators/debt-payoff-avalanche-vs-snowball-calculator): Runs both debt payoff orders side by side on the same money: the highest rate first, and the smallest balance first, over up to ten debts with their own rates…
- [Debt Sculpting DSCR LLCR Covenant Calculator](https://www.logiccommons.com/calculators/debt-sculpting-dscr-llcr-covenant-calculator): Builds a ten-year project debt schedule under target-DSCR, straight-line-principal, or level-debt-service routes, with beginning or noncircular average debt in…
- [Debt to Income Ratio Calculator](https://www.logiccommons.com/calculators/debt-to-income-ratio-calculator): Works out both debt-to-income ratios a lender measures you by, housing as a share of gross monthly income and all debt as a share of it, and puts them against…
- [Deck Material Takeoff Calculator](https://www.logiccommons.com/calculators/deck-material-takeoff-calculator) (web page only; not available over MCP): Draw a deck on FloorCanvas, exclude a hot tub or a tree, mark its rails and stairs, set its height, and get the joists, beams, posts (a post at both ends of ev…
- [Deductible vs Premium Tradeoff Calculator](https://www.logiccommons.com/calculators/deductible-vs-premium-tradeoff-calculator): Prices a high-deductible health plan against a low-deductible one over the same year of care, crediting the high-deductible side with all three of its advantag…
- [Disability Insurance Coverage Gap Calculator](https://www.logiccommons.com/calculators/disability-insurance-coverage-gap-calculator): Works out what a group long-term disability plan would actually leave you with each month after the tax an employer-paid benefit attracts, measures that agains…
- [Discounted Cash Flow Enterprise Equity Valuation Calculator](https://www.logiccommons.com/calculators/discounted-cash-flow-enterprise-equity-valuation-calculator): Discounts five annual unlevered free cash flows, adds a Gordon-growth or exit-multiple terminal value, and bridges enterprise value to synthetic equity value a…
- [Dollar Cost Averaging vs Lump Sum Calculator](https://www.logiccommons.com/calculators/dollar-cost-averaging-vs-lump-sum-calculator): Compares investing a sum all at once against feeding it in over several months, on a return you supply, and reports what each is worth at the end, how much the…
- [Driveway Slab Concrete Calculator](https://www.logiccommons.com/calculators/driveway-slab-concrete-calculator) (web page only; not available over MCP): Draw a slab or driveway on FloorCanvas, block out columns or drains, and get the concrete to order with waste, whether ready-mix is recommended, the trucks or…
- [Duct Sizing Calculator](https://www.logiccommons.com/calculators/duct-sizing-calculator): Sizes ductwork by the equal-friction method, reporting velocity, friction rate and the required round or equivalent rectangular size, in IP or SI. Use it to si…
- [Earthwork Cut Fill Calculator](https://www.logiccommons.com/calculators/earthwork-cut-fill-calculator): Computes cut and fill volumes by the average-end-area method with shrinkage and swell, plus the haul and mass balance. Use it to estimate earthwork quantities.
- [Effective Stress Calculator](https://www.logiccommons.com/calculators/effective-stress-calculator): Computes total stress, pore pressure and effective stress with depth, including a footing stress increase. Use it for geotechnical stress-profile calculations.
- [Emergency Fund Target Calculator](https://www.logiccommons.com/calculators/emergency-fund-target-calculator): Sizes an emergency fund in two layers, a reserve for the surprise bill that far more households meet than a layoff, plus months of only the part of essential s…
- [EOQ Calculator](https://www.logiccommons.com/calculators/eoq-calculator): Computes the economic order quantity that minimises ordering and holding cost, with the reorder point and quantity price breaks. Use it to set order sizes for…
- [Erlang C Staffing Calculator](https://www.logiccommons.com/calculators/erlang-c-staffing-calculator): Sizes contact-centre staffing with the Erlang C model, reporting the agents needed for a service-level target with occupancy and wait probability. Use it for c…
- [ESG Scorecard](https://www.logiccommons.com/calculators/esg-scorecard): Scores environmental, social and governance performance across the three pillars from a weighted questionnaire. Use it for a self-assessment of ESG posture; th…
- [EV Charger Circuit Planner Calculator](https://www.logiccommons.com/calculators/ev-charger-circuit-planner-calculator): Routes EVSE current from nameplate, restricted commissioning, or desired AC power; separates branch sizing from listed load-management allocation; derives cond…
- [Exponential MTBF Mission Reliability Calculator](https://www.logiccommons.com/calculators/exponential-mtbf-mission-reliability-calculator): Converts known MTBF or observed operating time and failures into constant-rate mission reliability, life metrics, and exact one-sided confidence bounds.
- [Extra Payment Impact Calculator](https://www.logiccommons.com/calculators/extra-payment-impact-calculator): Prices two different ways of paying a debt off sooner and keeps them apart: a recurring extra every month and a single lump sum, each run as its own full sched…
- [Financial Independence Number Calculator](https://www.logiccommons.com/calculators/financial-independence-number-calculator): Computes the invested balance that supports your spending at the withdrawal rate you plan to use, then finds how many years of saving and real growth it takes…
- [Fixture Unit Sizing Calculator](https://www.logiccommons.com/calculators/fixture-unit-sizing-calculator): Converts drainage or water fixture units to peak demand and a recommended pipe size. Use it for a first-pass plumbing pipe sizing.
- [Flooring Tile Calculator](https://www.logiccommons.com/calculators/flooring-tile-calculator) (web page only; not available over MCP): Draw a floor plan on FloorCanvas (rooms, interior walls, windows and doors), choose each room's floor (tile, plank, carpet, sheet vinyl or none) and its own pr…
- [FMEA RPN Calculator](https://www.logiccommons.com/calculators/fmea-rpn-calculator): Scores failure modes by severity, occurrence and detection to a risk priority number, with a severity gate for high-harm modes. Use it to rank and triage risks…
- [Framing Lumber Estimator](https://www.logiccommons.com/calculators/framing-lumber-estimator) (web page only; not available over MCP): Draw a floor plan on FloorCanvas (outline, interior walls, windows and doors), set the wall height and each opening's height, and get the studs, plate sticks,…
- [Freight Cost Calculator](https://www.logiccommons.com/calculators/freight-cost-calculator): Determines billable weight, freight class by density and the shipment cost. Use it to estimate less-than-truckload freight charges.
- [French Drain Yard Drainage Calculator](https://www.logiccommons.com/calculators/french-drain-yard-drainage-calculator): Routes Rational or direct inflow through eight full-pipe Manning candidates and exposes capacity, velocity, trench, gravel, and cost trade-offs.
- [Fuel Composition Combustion Excess Air Balance Calculator](https://www.logiccommons.com/calculators/fuel-composition-combustion-excess-air-balance-calculator): Balances complete combustion for a user-entered fuel composition: element totals, stoichiometric oxygen as C + H/4 + S - O/2, and the CO2, H2O, SO2, residual O…
- [FX Forward Money Market Hedge Calculator](https://www.logiccommons.com/calculators/fx-forward-money-market-hedge-calculator): Locks the domestic-currency value of a synthetic foreign receivable or payable through a forward contract, a borrow/invest money-market replication, or an expl…
- [Gage RR Calculator](https://www.logiccommons.com/calculators/gage-rr-calculator): Runs a Gage R&R measurement-system analysis by ANOVA, reporting repeatability, reproducibility, percent study variation and the number of distinct categories.…
- [Gas Mixture Molecular Weight Density Calculator](https://www.logiccommons.com/calculators/gas-mixture-molecular-weight-density-calculator): Computes mixture molecular weight, specific gas constant and density from a user-entered gas composition: mole fractions from entered amounts, Mmix as the mole…
- [Gear Train Speed Torque Mesh Force Calculator](https://www.logiccommons.com/calculators/gear-train-speed-torque-mesh-force-calculator): Rates one involute spur-gear mesh at common pitch: tooth-count ratio, driven speed, driven pitch diameter, output torque at an entered mesh efficiency, and the…
- [Generator Sizing Calculator](https://www.logiccommons.com/calculators/generator-sizing-calculator): Computes real and apparent running load, unrolls six motor-start groups, compares manual, priority-shed, automatic, and listed-EMS routes, checks split-phase l…
- [Glide Path Retirement Calculator](https://www.logiccommons.com/calculators/glide-path-retirement-calculator): Simulate 100 market futures for a retirement plan whose mix of equities, bonds and cash follows a glide path by age, inside a seeded, reproducible workbook, an…
- [Gutter Downspout Sizing Calculator](https://www.logiccommons.com/calculators/gutter-downspout-sizing-calculator): Routes direct or sectioned roof area through Rational runoff, Manning gutter capacity, and independent outlet-capacity and spacing counts.
- [Hand Arm Vibration A8 Calculator](https://www.logiccommons.com/calculators/hand-arm-vibration-a8-calculator): Combines up to 12 task-specific hand-arm vibration exposures into daily A(8), HSE exposure points, threshold utilization, and a dominant-task result.
- [Hearing Protector Attenuation Calculator](https://www.logiccommons.com/calculators/hearing-protector-attenuation-calculator): Estimates a protected A-weighted level from an individual fit-test Personal Attenuation Rating (PAR) or OSHA Noise Reduction Rating (NRR) adjustment methods.
- [Heat Exchanger LMTD Duty Area Calculator](https://www.logiccommons.com/calculators/heat-exchanger-lmtd-duty-area-calculator): Calculates the log mean temperature difference for ideal parallel-flow or counterflow terminal temperatures, rates heat duty from user-entered U and area, or s…
- [Heat Load Calculator](https://www.logiccommons.com/calculators/heat-load-calculator): Estimates a building's sensible and latent heating and cooling loads from its envelope, occupancy and design conditions, in IP or SI. Use it for a whole-house…
- [HIPAA Security Self Assessment](https://www.logiccommons.com/calculators/hipaa-security-self-assessment): Scores readiness against the HIPAA Security Rule safeguard areas from a weighted questionnaire. Use it for a self-assessment of security controls; the question…
- [Home Equity LTV Calculator](https://www.logiccommons.com/calculators/home-equity-ltv-calculator): Reports equity, the first-mortgage loan-to-value ratio and the combined ratio across every lien, and how much more you could borrow before reaching the limit a…
- [HSA and 529 Growth with Tax Treatment Calculator](https://www.logiccommons.com/calculators/hsa-and-529-growth-with-tax-treatment-calculator): Simulate 100 market futures for yearly contributions to a 529 plan or an HSA inside a seeded, reproducible workbook, and see the range of balances when the mon…
- [HSA Savings and Tax Benefit Calculator](https://www.logiccommons.com/calculators/hsa-savings-and-tax-benefit-calculator): Prices a health savings account on both of its sides: the tax a year's contribution avoids, split into the three layers that make it up, because federal income…
- [Ideal Gas Compressor Power Discharge Temperature Calculator](https://www.logiccommons.com/calculators/ideal-gas-compressor-power-discharge-temperature-calculator): Computes isentropic discharge temperature, specific work and shaft power for an ideal gas from the pressure ratio and the heat capacity ratio, either on the id…
- [Inflation Purchasing Power Calculator](https://www.logiccommons.com/calculators/inflation-purchasing-power-calculator): Restates an amount of money between any two years from 1913 on the official consumer price index. It reports the compound inflation rate over the period, besid…
- [Insulated Pipe Heat Loss Surface Temperature Calculator](https://www.logiccommons.com/calculators/insulated-pipe-heat-loss-surface-temperature-calculator): Calculates signed steady heat transfer, heat transfer per length, and cylindrical interface temperatures for a pipe wall plus optional insulation, with outside…
- [Insulation R Value Calculator](https://www.logiccommons.com/calculators/insulation-r-value-calculator) (web page only; not available over MCP): Draw a floor plan on FloorCanvas with its windows and doors, set the wall height, and get the exterior wall area net of openings, the attic area, the wall batt…
- [Integrated Three Statement Financial Forecast Calculator](https://www.logiccommons.com/calculators/integrated-three-statement-financial-forecast-calculator): Builds a five-period synthetic income statement, indirect cash-flow statement, and balance-sheet roll-forward from explicit operating, working-capital, capital…
- [Interest Rate Swap Valuation DV01 Calculator](https://www.logiccommons.com/calculators/interest-rate-swap-valuation-dv01-calculator): Values synthetic fixed and floating coupon legs on an entered discount curve, routes floating coupons through entered forwards or discount-factor-implied forwa…
- [Investment Fees Drag Calculator](https://www.logiccommons.com/calculators/investment-fees-drag-calculator): Prices an investment fee as what it costs rather than as what it is billed: the same plan is run twice, once with no fee and once with the fees you pay, and th…
- [Irrigation Zone Designer Calculator](https://www.logiccommons.com/calculators/irrigation-zone-designer-calculator): Combines eight irrigation groups into a simultaneous zone and audits flow, Hazen losses, pressure margins, precipitation matching, target depth, and cycle-and-…
- [Job Cost Markup Estimator](https://www.logiccommons.com/calculators/job-cost-markup-estimator): List a job's materials, labor, subcontractor and equipment costs line by line, set the overhead, profit and contingency rates and a sales tax on the materials…
- [Kelly Criterion Position Sizing Calculator](https://www.logiccommons.com/calculators/kelly-criterion-position-sizing-calculator): Find the Kelly bet, the share of the bankroll that makes it grow fastest over many bets, from your chance of winning and the odds, size your bet as a share of…
- [Landed Cost Calculator](https://www.logiccommons.com/calculators/landed-cost-calculator): Builds the landed cost per unit from the invoice price plus freight, duty and other fees, with the cost breakdown. Use it to price imported goods.
- [Leveraged Buyout Debt Paydown Returns Calculator](https://www.logiccommons.com/calculators/leveraged-buyout-debt-paydown-returns-calculator): Builds a synthetic seven-year operating and four-tranche debt schedule, applies mandatory amortization with an optional cash sweep, and bridges entry sponsor e…
- [Life Insurance Needs DIME Calculator](https://www.logiccommons.com/calculators/life-insurance-needs-dime-calculator): Works out how much life cover a household needs by the DIME method, adding debts, years of income, the mortgage payoff and the cost of education, taking off th…
- [Loan Amortization Schedule Calculator](https://www.logiccommons.com/calculators/loan-amortization-schedule-calculator): Works out the monthly payment on a plain amortising loan and prints the schedule it produces year by year: how much of each year's payments went to the balance…
- [Long Run Voltage Drop Calculator](https://www.logiccommons.com/calculators/long-run-voltage-drop-calculator): Derives AWG cross-section and temperature-adjusted conductor resistance, evaluates single-phase, balanced three-phase, or DC runs, and computes every editable…
- [Lot Coverage Impervious Area Calculator](https://www.logiccommons.com/calculators/lot-coverage-impervious-area-calculator) (web page only; not available over MCP): Draw a lot and the buildings and paved areas on it, say which are buildings, and get the lot coverage, the impervious share and the floor area ratio; coverage…
- [Lumped Body Heat Up Cool Down Calculator](https://www.logiccommons.com/calculators/lumped-body-heat-up-cool-down-calculator): Calculates the uniform-body temperature after an elapsed time or the finite time to a reachable target under a constant convective environment, while explicitl…
- [Margin Loan Leverage Calculator](https://www.logiccommons.com/calculators/margin-loan-leverage-calculator): Simulate 100 monthly price paths for a position bought partly with a margin loan inside a seeded, reproducible workbook, and see the chance of a margin call wi…
- [Marginal vs Effective Tax Rate Calculator](https://www.logiccommons.com/calculators/marginal-vs-effective-tax-rate-calculator): Works out the 2026 federal income tax on a household's income and reports the rate on the next dollar twice, as the statutory bracket rate and as the rate actu…
- [Merger Acquisition Accretion Dilution Calculator](https://www.logiccommons.com/calculators/merger-acquisition-accretion-dilution-calculator): Builds a transparent synthetic cash-and-stock consideration and financing bridge, applies recurring after-tax earnings adjustments, and compares pro forma dilu…
- [Monte Carlo Retirement Success Calculator](https://www.logiccommons.com/calculators/monte-carlo-retirement-success-calculator): Simulate 100 market futures for a retirement plan inside a seeded, reproducible workbook and see the share in which the money lasts, the spread of balances yea…
- [Mortgage Affordability Calculator](https://www.logiccommons.com/calculators/mortgage-affordability-calculator): Works out the most you can pay for a home from your income, your existing debts and the two qualifying ratios a lender applies, and says which of the two binds…
- [Mortgage Payment PITI Calculator](https://www.logiccommons.com/calculators/mortgage-payment-piti-calculator): Works out the full monthly cost of a mortgage -- principal, interest, property tax, homeowner insurance, association dues and mortgage insurance -- and stops c…
- [Mortgage Points Calculator](https://www.logiccommons.com/calculators/mortgage-points-calculator): Prices discount points as an investment with a horizon: what they cost, what they save each month, when the saving has repaid them, and what they are worth ove…
- [Mortgage Term Comparison Calculator](https://www.logiccommons.com/calculators/mortgage-term-comparison-calculator): Compares a shorter mortgage with a longer one on the same amount: the payment and total interest of each, and then a further comparison -- on the day the short…
- [Motor FLA Calculator](https://www.logiccommons.com/calculators/motor-fla-calculator): Derives a motor's full-load current from its power, voltage, efficiency and power factor, then sizes the branch-circuit conductor, overload and disconnect. Use…
- [Multi Stage Control Train Annual Emissions Mass Balance Calculator](https://www.logiccommons.com/calculators/multi-stage-control-train-annual-emissions-mass-balance-calculator): Accounts annual emissions through a serial control train: uncontrolled mass entered directly or as activity times a user-entered emission factor, then each sta…
- [Multi Tranche Loan Amortization Covenant Calculator](https://www.logiccommons.com/calculators/multi-tranche-loan-amortization-covenant-calculator): Rolls four synthetic loan tranches through mandatory amortization and priority cash sweeps, calculates fixed or benchmark-plus-spread interest, and tests lever…
- [Natural Gas Pipe Sizing Calculator](https://www.logiccommons.com/calculators/natural-gas-pipe-sizing-calculator): Sizes natural-gas pipe by the longest-length method from the required capacity in cubic feet per hour and the allowable pressure drop. Use it for a first-pass…
- [NIST CSF Readiness Assessment](https://www.logiccommons.com/calculators/nist-csf-readiness-assessment): Scores cybersecurity readiness across the six NIST Cybersecurity Framework functions, Govern, Identify, Protect, Detect, Respond and Recover, from a weighted q…
- [Occupational Noise Dose TWA Calculator](https://www.logiccommons.com/calculators/occupational-noise-dose-twa-calculator): Compares the same multi-segment workday under OSHA permissible-exposure-limit, OSHA hearing-conservation, and NIOSH recommended-exposure-limit rules.
- [OEE Calculator](https://www.logiccommons.com/calculators/oee-calculator): Computes overall equipment effectiveness as the product of availability, performance and quality from a week's production data. Use it to measure and diagnose…
- [Ohms Law Calculator](https://www.logiccommons.com/calculators/ohms-law-calculator): Solves Ohm's law and the AC power triangle from any two known values among voltage, current, resistance and power. Use it for quick electrical calculations acr…
- [Open Channel Flow Calculator](https://www.logiccommons.com/calculators/open-channel-flow-calculator): Draw a channel cross-section on FloorCanvas, type the water depth, slope and Manning's n, and get the flow area, wetted perimeter, hydraulic radius, top width,…
- [Option Pricing Binomial Black Scholes Greeks Calculator](https://www.logiccommons.com/calculators/option-pricing-binomial-black-scholes-greeks-calculator): Prices a synthetic call or put through Black-Scholes or a recombining Cox-Ross-Rubinstein tree, supports European and American tree exercise, and exposes analy…
- [Oxygen Reference Concentration Correction Calculator](https://www.logiccommons.com/calculators/oxygen-reference-concentration-correction-calculator): Applies the dry-basis oxygen reference correction, factor (20.9 - Oref)/(20.9 - Omeas), forward or in reverse. The correction is dimensionless so the concentra…
- [Paint Drywall Calculator](https://www.logiccommons.com/calculators/paint-drywall-calculator) (web page only; not available over MCP): Draw a floor plan on FloorCanvas (rooms, interior walls, windows and doors), set the wall height once and check each window's and door's height, lay the drywal…
- [Paver Patio Calculator](https://www.logiccommons.com/calculators/paver-patio-calculator) (web page only; not available over MCP): Draw a patio on FloorCanvas, leave out columns, beds or planters, and get the pavers to order with pattern waste, the base gravel and bedding sand, the edge re…
- [Pension Lump Sum Vs Annuity Calculator](https://www.logiccommons.com/calculators/pension-lump-sum-vs-annuity-calculator): Values a pension offered as a monthly payment against a lump sum alternative by discounting the payments at the return you believe you could earn on the cash,…
- [Pipe Expansion Support Calculator](https://www.logiccommons.com/calculators/pipe-expansion-support-calculator): Computes thermal expansion, guided-cantilever loop sizing and support spacing by stress and deflection. Use it for pipe expansion and support layout.
- [Pipe Pressure Drop Calculator](https://www.logiccommons.com/calculators/pipe-pressure-drop-calculator): Computes pipe pressure drop and head loss by Darcy-Weisbach with the Colebrook friction factor, alongside Hazen-Williams, with velocity and Reynolds number. Us…
- [Pollutant PPMV Mass Concentration Emission Rate Calculator](https://www.logiccommons.com/calculators/pollutant-ppmv-mass-concentration-emission-rate-calculator): Converts a gas pollutant between ppmv and mass concentration through the ideal-gas molar density P/(RT) and a user-entered molecular weight, then multiplies by…
- [Pool Volume Liner Calculator](https://www.logiccommons.com/calculators/pool-volume-liner-calculator) (web page only; not available over MCP): Draw a pool on FloorCanvas, leave out islands or planters, and enter the depth at each end and a fill rate to get the water volume in gallons or litres, the li…
- [PPA Revenue Escalation Merchant Tail Calculator](https://www.logiccommons.com/calculators/ppa-revenue-escalation-merchant-tail-calculator): Builds a ten-year energy-revenue schedule with cumulative degradation, capacity factor, availability, curtailment, contract term and share, escalated or entere…
- [Process Capability Calculator](https://www.logiccommons.com/calculators/process-capability-calculator): Computes the process capability indices Cp, Cpk, Pp and Ppk against your specification limits, with the estimated defect rate. Use it to judge whether a proces…
- [Project Equity IRR Distribution Waterfall Calculator](https://www.logiccommons.com/calculators/project-equity-irr-distribution-waterfall-calculator): Allocates ten-period equity contributions and project distributions under pro rata ownership or a preferred-return waterfall with simple/compound accrual, retu…
- [Project Finance Sources Uses Cash Flow Waterfall Calculator](https://www.logiccommons.com/calculators/project-finance-sources-uses-cash-flow-waterfall-calculator): Links construction sources and uses to an eight-period project cash waterfall with selectable funding priority, cash-tax treatment, scheduled debt service, opt…
- [Psychrometric Calculator](https://www.logiccommons.com/calculators/psychrometric-calculator): Computes moist-air properties such as wet-bulb, humidity ratio, enthalpy and dew point from two known properties, in IP or SI units. Use it for HVAC air-state…
- [Pump Fan Affinity Law Scaling Calculator](https://www.logiccommons.com/calculators/pump-fan-affinity-law-scaling-calculator): Scales a known pump or fan duty point to a new speed with the affinity laws: flow with the speed ratio, pressure rise with its square, shaft power with its cub…
- [Pump Head Power Calculator](https://www.logiccommons.com/calculators/pump-head-power-calculator): Computes total dynamic head, hydraulic and brake power and the NPSH margin for a pump, with the system curve. Use it to select and check a pump.
- [Rainwater Harvesting Tank Sizer Calculator](https://www.logiccommons.com/calculators/rainwater-harvesting-tank-sizer-calculator): Runs a twelve-month storage balance across one entered tank or a fixed 21-capacity ladder and exposes reliability, overflow, reserve, and simple economics.
- [Rational Method Runoff Calculator](https://www.logiccommons.com/calculators/rational-method-runoff-calculator): Computes peak stormwater runoff by the rational method from a weighted runoff coefficient, rainfall intensity and drainage area, with time of concentration. Us…
- [Real vs Nominal Return Calculator](https://www.logiccommons.com/calculators/real-vs-nominal-return-calculator): Turns a nominal return into what it is actually worth once inflation and, optionally, tax have taken their share, using the Fisher relation rather than the usu…
- [Refinance Break Even Calculator](https://www.logiccommons.com/calculators/refinance-break-even-calculator): Says how many months a refinance takes to repay what it costs, measured against the term remaining on the loan you have rather than a fresh full term, so a lon…
- [Reliability Demonstration Test Calculator](https://www.logiccommons.com/calculators/reliability-demonstration-test-calculator): Plans exact zero-failure exponential accumulated-time or binomial pass/fail demonstrations without copied test-plan tables.
- [Rent vs Buy Calculator](https://www.logiccommons.com/calculators/rent-vs-buy-calculator): Compares renting with buying on the net worth each leaves you with at the end of the period you expect to stay, rather than on monthly cost. The renter's down…
- [Rental Property Cash Flow Return Calculator](https://www.logiccommons.com/calculators/rental-property-cash-flow-return-calculator): Work out the cash flow, cap rate, cash-on-cash return, debt service coverage and return on the money invested of one rental property, before income tax, then s…
- [Repairable System Availability Calculator](https://www.logiccommons.com/calculators/repairable-system-availability-calculator): Evaluates a two-state repairable system with constant failure and repair rates, including transient, average, and steady-state availability.
- [Required Minimum Distribution Calculator](https://www.logiccommons.com/calculators/required-minimum-distribution-calculator): Projects the required minimum distributions from a retirement account year by year from a life-expectancy divisor that falls as you age, and reports the larges…
- [Retaining Wall Earth Pressure Calculator](https://www.logiccommons.com/calculators/retaining-wall-earth-pressure-calculator): Computes active and passive earth pressure and the overturning, sliding and bearing checks for a retaining wall. Use it for a first-pass wall stability check.
- [Retirement Contribution Employer Match Calculator](https://www.logiccommons.com/calculators/retirement-contribution-employer-match-calculator): Works out what you and your employer put into a workplace retirement plan over a year from the share of pay you defer, applies the plan's tiered match, and rep…
- [Retirement Drawdown Withdrawal Calculator](https://www.logiccommons.com/calculators/retirement-drawdown-withdrawal-calculator): Runs a retirement balance forward year by year against a withdrawal that rises with inflation, and reports whether the money lasts, the year it would first fal…
- [Retirement Savings Projection Calculator](https://www.logiccommons.com/calculators/retirement-savings-projection-calculator): Projects what your retirement savings grow to by the age you plan to stop working, reported in today's money as well as the money of that year, and the annual…
- [Revised NIOSH Lifting Equation Calculator](https://www.logiccommons.com/calculators/revised-niosh-lifting-equation-calculator): Calculates single-task Recommended Weight Limit and Lifting Index at the origin and, when significant destination control is required, at the destination.
- [Roof Area From Plan Calculator](https://www.logiccommons.com/calculators/roof-area-from-plan-calculator) (web page only; not available over MCP): Draw a roof on FloorCanvas, its ridges, hips and valleys and each facet's pitch, and get the true roof area, the squares, the shingle bundles and underlayment…
- [Room Heat Load Heater AC Sizer Calculator](https://www.logiccommons.com/calculators/room-heat-load-heater-ac-sizer-calculator): Builds a room-level steady-state heating and cooling load from envelope UA, outdoor airflow, solar, sensible, and latent gains, then screens user-entered equip…
- [Roth Conversion Tax Impact Calculator](https://www.logiccommons.com/calculators/roth-conversion-tax-impact-calculator): Compares converting a traditional balance to a Roth against leaving it alone, paying the conversion tax now and taxing the untouched balance when you eventuall…
- [Rule of 72 Doubling Time Calculator](https://www.logiccommons.com/calculators/rule-of-72-doubling-time-calculator): Puts the rule of 72 beside the exact doubling time for your rate and compounding frequency, and reports how far the rule is off in years and as a share, the nu…
- [Safety Stock Calculator](https://www.logiccommons.com/calculators/safety-stock-calculator): Computes safety stock and reorder point from demand and lead-time variability at a target service level, with the fill rate. Use it to set inventory buffers.
- [Savings Goal Calculator](https://www.logiccommons.com/calculators/savings-goal-calculator): Works out what you must put aside each month to reach a savings goal by a deadline, given what you have already saved and the return you expect. It then does t…
- [Sectional Properties Calculator](https://www.logiccommons.com/calculators/sectional-properties-calculator): Draw a cross-section, or send its outline and up to five holes as rows in FEET (US) or METRES (Metric), not inches, with Y running down, and get its area, cent…
- [Shaft Power Torque Torsion Calculator](https://www.logiccommons.com/calculators/shaft-power-torque-torsion-calculator): Solves any one of shaft power, torque or rotational speed from the other two, then rates a solid or hollow circular shaft in torsion: polar moment, maximum she…
- [Siding Exterior Trim Calculator](https://www.logiccommons.com/calculators/siding-exterior-trim-calculator) (web page only; not available over MCP): Draw a one-storey house's outline on FloorCanvas, add its windows and doors, set the wall height and each opening's height, mark which doors are exterior, ente…
- [Sigma DPMO Converter](https://www.logiccommons.com/calculators/sigma-dpmo-converter): Converts between defects per million opportunities, yield and sigma level, including the 1.5 sigma shift. Use it to express process performance on the Six Sigm…
- [Single DOF Forced Vibration Response Calculator](https://www.logiccommons.com/calculators/single-dof-forced-vibration-response-calculator): Computes the steady-state response of a linear single-degree-of-freedom oscillator to harmonic force or harmonic base displacement: natural frequency, damping…
- [Slope Stability Calculator](https://www.logiccommons.com/calculators/slope-stability-calculator): Computes the factor of safety of a slope by the infinite-slope method, dry or with seepage. Use it for a first-pass slope stability check.
- [Sludge Volume Index Settleability Calculator](https://www.logiccommons.com/calculators/sludge-volume-index-settleability-calculator): Calculates standard 30-minute sludge volume index and companion settling indicators from either one 30-minute observation or a fixed 5-60 minute settling curve.
- [Social Security Claiming Age Calculator](https://www.logiccommons.com/calculators/social-security-claiming-age-calculator): Applies the early-claiming reduction and the delayed-retirement credits to the monthly benefit you would receive at full retirement age, then compares two clai…
- [Sod Seed Topsoil Calculator](https://www.logiccommons.com/calculators/sod-seed-topsoil-calculator) (web page only; not available over MCP): Draw a lawn on FloorCanvas, leave out beds and hardscape, and get the sod rolls and pallets, topsoil and grass seed to order, in US or Metric units. Canvas edi…
- [Solar Battery Starter Sizing Calculator](https://www.logiccommons.com/calculators/solar-battery-starter-sizing-calculator): Screens annual-energy, backup-with-recharge, or combined solar-plus-storage requirements against eight editable packages and exposes energy flow, power gates,…
- [Solar Payback Calculator](https://www.logiccommons.com/calculators/solar-payback-calculator): Models a solar PV system's production, bill savings and 25-year cash flow to report simple and discounted payback, return on investment, net present value and…
- [Solids Retention Time MCRT Calculator](https://www.logiccommons.com/calculators/solids-retention-time-mcrt-calculator): Calculates actual SRT/MCRT from system inventory and measured solids exits, or solves the nonnegative waste flow required for an entered target SRT on a consis…
- [Stack Flow Actual Standard Wet Dry Normalization Calculator](https://www.logiccommons.com/calculators/stack-flow-actual-standard-wet-dry-normalization-calculator): Converts a stack-gas volumetric flow between wet and dry bases and normalises it to user-entered reference conditions: the dry fraction is one minus the water-…
- [Stair Calculator](https://www.logiccommons.com/calculators/stair-calculator): Enter a stair's total rise, your target riser height and tread depth, and get the number of risers and treads, the actual riser height, the total run, and the…
- [Steel Column Capacity Calculator](https://www.logiccommons.com/calculators/steel-column-capacity-calculator): Computes the axial capacity of a steel column across both buckling branches, in LRFD and ASD, against the applied load. Use it for a first-pass column check.
- [Storm Pipe Sizing Calculator](https://www.logiccommons.com/calculators/storm-pipe-sizing-calculator): Sizes a storm drainage pipe by Manning's equation, reporting full-flow capacity, velocity and the recommended diameter. Use it to size gravity storm pipe.
- [Student Loan Repayment Planner Calculator](https://www.logiccommons.com/calculators/student-loan-repayment-planner-calculator): Prices a student loan on the repayment term you choose and puts the ten, twenty and twenty-five year terms beside it from the same balance and rate, so the cos…
- [Sump Pump Sizing Calculator](https://www.logiccommons.com/calculators/sump-pump-sizing-calculator): Intersects eight auditable generic pump curves with a routed discharge-system curve, then screens flow reserve, velocity, and optional cycling.
- [System Reliability Block Calculator](https://www.logiccommons.com/calculators/system-reliability-block-calculator): Calculates independent-component series, parallel, or identical-component K-out-of-N mission reliability without external reliability tables.
- [Take Home Pay Paycheck Calculator](https://www.logiccommons.com/calculators/take-home-pay-paycheck-calculator): Estimates each paycheck from a salary with the IRS's 2026 withholding tables, applies each pre-tax deduction only to the wages it actually reduces, and sets th…
- [Tank Volume Calculator](https://www.logiccommons.com/calculators/tank-volume-calculator): Computes full and partial volume for horizontal and vertical tanks with various heads, and a dip chart. Use it to gauge tank contents.
- [Tax Depreciation NOL Carryforward Cash Tax Calculator](https://www.logiccommons.com/calculators/tax-depreciation-nol-carryforward-cash-tax-calculator): Builds a ten-year synthetic cash-tax schedule with straight-line, declining-balance, or entered depreciation; full or EBITDA-capped interest deduction with car…
- [Tax Loss Harvesting Benefit Calculator](https://www.logiccommons.com/calculators/tax-loss-harvesting-benefit-calculator): Prices a harvested investment loss as the deferral it is: the tax it saves this year under the netting order the Internal Revenue Service sets out, the carried…
- [Thermal Energy Storage Capacity Calculator](https://www.logiccommons.com/calculators/thermal-energy-storage-capacity-calculator): Evaluates or sizes ideal sensible, latent, or combined sensible-plus-latent thermal storage and calculates source-side charge energy, delivered energy, and cha…
- [Total Cost of Car Ownership Calculator](https://www.logiccommons.com/calculators/total-cost-of-car-ownership-calculator): Works out what a car costs to own over the years you keep it, in the six categories AAA counts (depreciation, loan interest, fuel or electricity, insurance, up…
- [Traditional Vs Roth Contribution Calculator](https://www.logiccommons.com/calculators/traditional-vs-roth-contribution-calculator): Compares a traditional and a Roth contribution of the same size by growing each forward and taxing it on the rules that apply to it, so the two are judged on w…
- [Transformer Sizing Calculator](https://www.logiccommons.com/calculators/transformer-sizing-calculator): Sizes a transformer from the connected load, growth and diversity, and selects the smallest standard kVA rating with its primary and secondary full-load curren…
- [Two Surface Thermal Radiation Exchange Calculator](https://www.logiccommons.com/calculators/two-surface-thermal-radiation-exchange-calculator): Calculates signed diffuse-gray radiative exchange for an entered two-surface enclosure network or for a small surface in a large isothermal enclosure.
- [USCS Soil Classification Calculator](https://www.logiccommons.com/calculators/uscs-soil-classification-calculator): Classifies a soil to a Unified Soil Classification group symbol from its gradation and Atterberg limits. Use it to identify a soil for geotechnical work.
- [Vendor Risk Scorecard](https://www.logiccommons.com/calculators/vendor-risk-scorecard): Scores a third-party vendor's risk across several domains from a weighted questionnaire, with a risk tier. Use it to triage vendor due diligence; the questions…
- [Ventilation Fresh Air Calculator](https://www.logiccommons.com/calculators/ventilation-fresh-air-calculator): Calculates a whole-dwelling outdoor-air target from editable area and room rates, an entered target, or a CO2 mass balance, then checks installed airflow and a…
- [Voltage Drop Calculator](https://www.logiccommons.com/calculators/voltage-drop-calculator): Calculates the voltage drop along a conductor run from its size, length, load current and material, reporting the drop in volts and as a percent against your l…
- [Water Hammer Surge Estimator Calculator](https://www.logiccommons.com/calculators/water-hammer-surge-estimator-calculator): Screens eight valve or pump events with routed velocity, elastic or entered wave speed, critical closure time, and Joukowsky pressure change.
- [WBGT Heat Stress Screening Calculator](https://www.logiccommons.com/calculators/wbgt-heat-stress-screening-calculator): Calculates measured and clothing-adjusted WBGT from natural wet-bulb, globe, and conditionally required dry-bulb sensor readings, then compares the result with…
- [Weibull Life Reliability Calculator](https://www.logiccommons.com/calculators/weibull-life-reliability-calculator): Evaluates a two-parameter Weibull life model from an entered shape, characteristic life, time, and target failed fraction.
- [Whole Home Electrification Load Calculator](https://www.logiccommons.com/calculators/whole-home-electrification-load-calculator): Compares connected-load, separated-new-load, and metered maximum-demand routes for a before-and-after home electrification project while preserving an auditabl…
- [Window Heat Gain Loss Comparator Calculator](https://www.logiccommons.com/calculators/window-heat-gain-loss-comparator-calculator): Compares user-entered window U-factors, solar-gain coefficients, and installed costs across heating, cooling, or combined scopes, then selects by annual energy…
- [Wire Size Calculator](https://www.logiccommons.com/calculators/wire-size-calculator): Sizes a copper conductor for both voltage drop and ampacity and reports which one governs. Use it to pick the smallest conductor that carries the load and stay…
- [Yield Curve Bootstrap Forward Rate Calculator](https://www.logiccommons.com/calculators/yield-curve-bootstrap-forward-rate-calculator): Bootstraps eight annual discount factors from a synthetic mix of zero-rate and par-coupon instruments, derives zero and one-year forward rates, and interpolate…