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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.

Tool category

MEP Quick-Check Estimators calculators

Wire and conduit runs, light layouts, and BTU sizing sanity-checks for the trades. 4 free calculators below.

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4 calculators

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

Electrical
Conduit Fill & Voltage Drop SizerVoltage drop calculator and conduit fill checker for branch circuits. Flags NEC violations live and picks the right wire and conduit size. Free, no sign-up.Calculates: NEC fill %Use tool
HVAC
HVAC BTU Load & AC Tonnage SizerBTU calculator for heating and cooling loads with AC tonnage from sq ft, climate zone, and insulation quality. Rounds up to the half ton. Free, no sign-up.Calculates: Cooling BTUUse tool
Electrical
Recessed Light LayoutRecessed lighting calculator that sizes fixture counts and even spacing grids from room size. Enter target spacing — the grid solves live. Free, no sign-up.Calculates: Fixture countUse tool
Plumbing
PEX Pipe Runs & WSFU SizerPEX pipe size calculator for water supply: WSFU fixture-unit totals size the main, with coil footage, manifold ports, and fitting packs. Free, no sign-up.Calculates: PEX coilsUse tool
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