QuantityBench Free construction calculators
Fast, accurate estimates for common home-improvement projects. No signup, no app — just enter your numbers and get a clear answer, with the math explained.
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Why use these calculators
Every calculator on this site shows its formula in plain language, not just a black-box number, and supports both US customary and metric units. Each one includes a 10% material waste allowance where relevant, since ordering the bare minimum almost always leaves you short. Results run entirely in your browser — nothing you enter is sent anywhere. See the Methodology page for where the reference numbers come from, or About for what this site is and isn't.