Trade Tools

8 free construction calculators built for plumbers, electricians, tilers, concrete workers, and DIYers. No login required, no ads, works offline on any device. What you can calculate: Pipe sizing using the Hazen-Williams formula — enter flow rate, pipe length, and material to get the right diameter instantly Concrete volume — calculate bags or cubic meters for slabs, footings, and columns Electrical load — total up circuit loads and check against breaker capacity Wire gauge — find the correct AWG or mm² cable size based on current and run length (NEC compliant) Roof pitch — convert between degrees, percentage, and rise-over-run Tile quantity — calculate tiles needed for any room with waste factor included Paint coverage — get exact litres or gallons needed based on wall area and coats Stud spacing — calculate stud count and layout for any wall length Who it's for: Plumbers sizing residential and commercial pipe runs. Electricians checking load capacity and wire gauge before rough-in. Tilers quoting jobs without a spreadsheet. Site managers double-checking concrete orders. DIYers who want a professional result without guessing. Why it's different: No registration. No paywalls. No ads interrupting your workflow. Every calculator works offline — open it on your phone on a job site with no signal and it still works. Results are instant and the interface is clean enough to use with work gloves on. Available in English, Spanish, French, and German. Full metric and imperial support across all calculators.