Feet & inches calculator
Add, subtract, multiply and divide lengths in feet, inches and fractions.
Choose a calculator
Wall framing & stud calculator
Calculate common studs, corner backing, plates and sheathing for any wall length.
Stair calculator
Total rise to equal risers, treads, total run and stringer length.
Rafter length calculator
Common rafter length, overhang and cut angles from run and pitch.
Right triangle & 3-4-5 calculator
Diagonals, missing sides and square checks for layout.
Roof pitch calculator
Rise and run to x:12 pitch, angle, percent slope and slope factor.
Roof area & shingle calculator
Roof surface, roofing squares and shingle bundles from building size and pitch.
Drywall sheet calculator
Drywall sheets for a room from dimensions, openings, sheet size and waste.
Decimal to fraction converter
Decimal inches or feet to tape-measure fractions.
Concrete calculator
Slab, footing, sonotube and column volume in cubic yards and bags.
How these calculators work
All calculations run in your browser and nothing you enter is stored or sent to a server. Results are only as good as the measurements you enter, so use finished dimensions, keep the same units on both sides of a formula and round once at the end.
The tools calculate geometry and quantities. They do not choose structural members, confirm code compliance or replace project drawings, so check the applicable plans and local requirements before cutting or ordering. New to the formulas? Start with the construction math guide, which has a formula table and practice problems with answers.
Take the next job with you
View on the App Store ↗Keep the calculation with the project.
Use feet-inch fractions, specialty trade tools and saved job calculations in Construction Pro for iPhone and iPad. Free download with in-app Pro options.