About PipeSizeCalculator

Free, accurate trade calculators built for people who work with their hands.

What we built

PipeSizeCalculator.com started as a pipe sizing tool and grew into a full suite of 8 free construction trade calculators. Every tool is built around the same principle: give tradespeople and DIYers fast, reliable answers without paywalls or account registration.

Pipe Size CalculatorHazen-Williams equation — PVC, copper, PEX, steel

Concrete CalculatorSlabs, footings, columns — bags or ready-mix

Electrical Load CalculatorBreaker sizing — NEC 125% rule

Wire Gauge CalculatorAWG & mm² — voltage drop calculation

Roof Pitch CalculatorDegrees, percentage, rafter length & roof area

Tile CalculatorFloor & wall tiles with waste allowance

Paint CalculatorLitres & gallons — rooms, walls, ceilings

Stud Spacing CalculatorTimber & metal stud wall framing

Who built it

I live in a country where the language changes depending on which part of the country you're in. On a construction job that crosses regions, you might have a German-speaking plumber, a French-speaking electrician, and an English spec sheet — all on the same project.

Every calculator I found online was English-only. The ones that had other languages still used American standards, American units, American electrical codes. Useless.

So I built my own. Four languages, local standards, no account required. That's it.

Why it's free

Good tools shouldn't cost money. A plumber on a job site sizing a pipe shouldn't have to subscribe to software to get a reliable answer. Every calculator on this site is completely free, works offline, requires no account, and has no usage limits.

Get in touch

Found a bug? Have a suggestion? Contact us here or email hello@pipesizecalculator.com.