Construction Calculator: Feet

The calculator

The math keeps exact fractions between steps, so a long chain of adds and subtracts doesn't drift. You choose how to round the answer, from 1/2″ down to 1/64″, and a rounded answer is marked with the exact value right under it.

• Answers in feet and inches, inches, mm, cm or m. The Conv sheet converts any answer, yards included.
• Square and cubic feet: 10 feet times 12 feet gives 120 ft².
• The tape keeps every answer, newest first, even after you close the app. Tap a line to use it again.
• A dark theme, and Outdoor light, a bright theme for working in the sun.

Pro tools

Pro is a one time $6.99 purchase through Google Play. You can try every tool with sample values before you buy.

• Stairs: riser count and height, treads, total run, stringer length and angle from the total rise, with an optional landing and headroom check.
• Rafter and roof pitch: rafter length with overhang, slope factor, plumb and seat cut angles.
• Right triangle: diagonal, angles and area. Handy for checking a corner for square.
• Concrete: slabs, footings and columns in cubic feet and yards, bags of 40, 60 or 80 lb, and waste.
• Block and brick, drywall, paint, flooring and tile, board feet: counts and quantities for a wall, a room or a stack of lumber.

Each tool keeps what you typed apart from what it worked out, with a short note on how it got there. Save results to a job like "Back deck" and share the job as a PDF.

Questions