Construction Calculator

Construction Calculator is a free collection of practical calculators for concrete, stairs, feet and inches, board feet, rebar, bricks, roofing, drywall, paint, flooring, decks, fences, area, volume, and more. Every result shows the formula, calculation steps, units, rounding, and assumptions so contractors, builders, and DIY users can verify the math instead of trusting a black-box total. The tools support both metric and imperial units, include practical field fractions where relevant, and require no signup.