US Construction Calculators · 286 Tools
Construction estimates, with the math shown.
Free, instant, US imperial.
Concrete volumes. Roof shingles. Paint gallons. Boiler sizes. Every formula is shown, every number is editable, and nothing leaves your browser.
Plan a whole job
Goes further than a single figure — set out a whole floor and see where every cut lands before you order.
- Set-out Tile & Paving Layout Planner See where the cuts land before you order. Compare start positions, work round cut-outs, and export the drawing and cut list.
- Take-off Estimator Turn results from these calculators into a priced estimate. Materials from every section combine into one order list, rounded to whole packs once, and print as a quote. Works without an account.
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Timber & Framing How Many Decking Boards Do I Need Rows across the deck, running length along it, whole boards to cover that length. The formula, a worked example carried through in metric with imperial equivalents, the gap and wastage allowances that shift the count, and the board sizes that the same question travels under in the UK, North America and Australia. -
Timber & Framing Board Feet and Timber Volume Explained A board foot is a unit of volume, not of length, and a cubic metre holds 423.8 of them. The formulas both ways, a worked example in metric with imperial equivalents, and the nominal-versus-finished distinction that inflates most timber tallies by about half. -
Roofing Flat Roof Materials: EPDM, GRP and Felt Coverage Flat roof materials are ordered against the covering, not the deck. The formula, a worked example on a 32.4 m² extension roof, and where upstands and laps add a fifth to the order.
Estimates, not advice.
BuildMetricLab is a planning tool. Results are intended to help you scope a job and request quotes — they are not a substitute for a licensed contractor's quote, structural engineer's calculation, or building permit sign-off. Always verify with a professional before ordering materials or starting work.