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Free construction calculators for contractors, builders, estimators, and homeowners. Every tool runs in your browser — no account, no subscription, your numbers never leave your device.

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Estimates are planning aids verify quantities against your local codes and supplier quotes.

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Field Converters & Master Proposal calculators

Feet-inches-fractions converters, unit conversions, and right-triangle helpers that live on every job. 4 free calculators below.

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4 calculators

Every tool below is free results update live as you type.

Converters
Feet-Inches-Fraction KeypadFraction calculator for feet, inches and fractions: add, subtract, multiply and divide jobsite dimensions to 1/16 inch with exact results. Free, no sign-up.Calculates: Architectural resultUse tool
Converters
Construction Unit ConverterConstruction unit converter for area, volume and weight: sq ft, roofing squares, cu yd, acres, gallons, tons and metric, two-way and instant. Free, no sign-up.Calculates: Converted valueUse tool
Layout Math
Right Triangle & 3-4-53-4-5 triangle calculator and right triangle solver: find hypotenuses, missing legs and angles, and verify square corners on any layout. Free, no sign-up.Calculates: HypotenuseUse tool
Proposal
Master Proposal BuilderContractor proposal template that turns bid lines into a branded client-ready PDF with markup, contingency, tax and a payment schedule. Free, no sign-up.Calculates: Client-ready PDF proposalUse tool
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