Construction Calculator

Construction Calculator does every jobsite calculation in exact feet, inches and fractions: stairs, concrete, roofing, framing, cut lists and more, with live results while you type. The everyday calculators are free; Pro unlocks everything with a yearly subscription or a one-time lifetime purchase on Google Play.

Built for carpenters, framers, remodelers, deck builders, concrete crews, roofers, small contractors and DIYers. Type 5' 3 1/2" or 1.6 m in any field, switch units per field, and read the answer the moment the numbers are in. No Calculate button, no account, no ads, and it works offline on the roof, in the basement or on a site with no signal.

FROM TAPE MEASURE TO THE RIGHT NUMBER
• Feet-inch calculator with exact fractions down to 1/16" or 1/64", plus metric: add, subtract, multiply and divide without converting first
• Tape: a running list of results; tap a line to use it as the next input or copy it
• Show the math: inputs, assumptions and formula behind every answer, so you can double-check it

THE CALCULATORS TRADES SEARCH FOR
• Stair calculator: risers, treads, total run, stringer length, angle and 2R+T, with a drawing and the IRC riser and tread limits; also L, U, winder and spiral stairs, stringer cut list, deck stairs
• Concrete calculator: slab, footing, column, wall and post holes in cubic yards or m³, plus the number of 40 to 80-lb or 25 to 40-kg bags; pour planner with calculated vs. order quantity and truck loads
• Roofing calculator: roof pitch, squares and shingle bundles with waste; common, hip and valley rafters, birdsmouth, roof trim
• Framing and finishes: wall framing, board feet, compound miter and crown, drywall, flooring, tile, paint, mulch, gravel, pavers
• 100+ construction calculators in 7 groups: layout, concrete, stairs, roofing, framing, landscape, finishes

LESS WASTE, FEWER MISTAKES
• Linear cut optimizer: cut lists from your stock lengths with a cut plan that shows the waste, so you buy the right boards
• Calculated amount, waste allowance and order quantity are shown separately, so nothing is ordered short
• Results outside a calculator's valid range say so instead of guessing

JOBS AND SHARING
• Save calculations and material lists per job, add unit prices and see the total
• Share as PDF, CSV or text; back up and restore your jobs as a file
• Calculations and saved jobs stay on your device. No account required.

FREE VS. PRO
• Free without limits: feet-inch, fraction to decimal, right triangle, area and volume, stair calculator, concrete slab and bags, roof pitch, shingles, board feet, mulch, gravel, plus the full reference section (converters, fraction chart, nominal vs. actual lumber, bag yields)
• Never locked: + - x /, fractions, feet-inch input, copy and unit conversion
• Pro: hip and valley rafters, L, U, winder and spiral stairs, stringer cut list, rebar and block walls, wall framing, drywall, flooring, tile, paint, cut optimizer, jobs and more

Search by trade word, pin favorites, reopen recent results. Light and dark theme.

Measure once, order right. Results are calculations, not orders or code approval. Code limits follow the 2024 IRC model code criteria listed in each calculator; verify with your local building authority and your supplier before you buy. Not affiliated with the ICC.

SUBSCRIPTION INFORMATION
Pro is available as a yearly subscription or as a one-time lifetime purchase. Payment is charged to your Google Play account. The yearly subscription renews automatically until you cancel it. Cancel anytime in Google Play > Payments & subscriptions > Subscriptions; Pro stays active until the paid period ends. The one-time purchase unlocks Pro for good on your Google account. Restore your purchase from the paywall or Settings.

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Support: https://construction-calculator.expo.app/support/