Free feet and inches calculator
Add and subtract construction measurements without treating inches as decimals. Follow a feet-and-inches example, then check it in Onsite Math.
FIELD REFERENCE
Construction math,
worked through.
Follow the units, check the assumptions and verify the answer before using it on a job.
Concrete slab volume: feet, inches and cubic yards
Calculate a rectangular slab volume with a worked 12 × 10 ft example, thickness conversion and a separate waste allowance.
Equal spacing between posts: gaps versus centres
Work through equal clear gaps between posts and distinguish them from centre-to-centre spacing before laying out a run.
Best construction calculator app for iPhone? Choose by the job
Compare construction calculator workflows for feet and inches, advanced layouts and quick estimates. Find the right fit before buying a lifetime unlock.