The math your phone
calculator can't do.
Add feet, inches and fractions, lay out stairs to code, size up a concrete pour — free, right in your browser. No app to install, no sign-up.
Why not just use a phone calculator?
A phone calculator works in plain decimals. It can't add 5 ft 7 in to 2 ft 10-1/2 in, tell you how many 80 lb bags fill a footing, or flag a stair riser that fails code. BuildCalc is built for the measurements construction actually uses — feet, inches and sixteenths — so the numbers come out right the first time.
Free
No account
No install
Runs in browser
Offline
No signal needed