Construction Calculator & Cost

Construction Calculator brings 16 jobsite calculators into one offline app — built for contractors, framers, masons, roofers, tile setters, drywallers, painters and serious DIYers. Toggle between metric and imperial units, see the formula behind every result, and keep your numbers on-device.

Calculators included:

Concrete and earthwork
• Concrete — slabs, columns and cylinders. Volume plus cement bags, sand and gravel by mix ratio (general, strong or light).
• Footing — strip and pad foundations with a dry-batch coefficient for material purchasing.
• Gravel and fill — volume and weight for gravel, sand, crushed stone and topsoil.

Framing and structure
• Wood / lumber — board feet for 2×4 through 6×6 (or custom dimensions) with wastage.
• Rebar — bar count, total length and weight for one-way or two-way slabs. ASTM A615 sizes #3 through #8.
• Stair — riser count, riser height, tread depth, stringer length and angle using the 7-11 rule.
• Roof — gable or hip roof area, pitch angle and common rafter length.

Walls and finishing
• Brick — brick count and mortar volume for any wall, with wastage.
• Drywall — sheets, joint compound and joint tape for 4×8 or 4×12 panels.
• Tile — tile count with gap spacing and waste percentage, with 5 size presets.
• Paint — paint volume and cans for multi-wall rooms, with door and window deductions.
• Insulation — roll count by R-value (R-11, R-13, R-19, R-30, R-38) and roll size.

General math
• Area — rectangle, triangle, circle and trapezoid.
• Volume — rectangular box, cylinder and sphere.
• Feet and inches — add, subtract, multiply and divide imperial measurements with 1/16-inch fractions.
• Unit converter — 31 units across length, area, volume, weight and temperature.

How it works
• One-tap metric / imperial toggle applies to every calculator.
• Every result shows its formula, so you can check the work.
• Isometric 3D diagrams help you visualise dimensions before you cut.
• Calculation history is stored on your device (up to 100 entries).
• Enter your own unit prices once and get a material cost on every calculation.
• 34 languages built in.
• Works fully offline. No account, no sign-in.

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