Construction Calculator

Construction Calculator is a free browser-based collection of calculators for concrete, stairs, feet and inches, board feet, rebar, bricks, roofing, drywall, paint, flooring, and more. Unlike calculators that only return a number, every result shows the formula, calculation steps, units, and assumptions so users can review the math. It supports metric and imperial units, requires no signup, and is designed for builders, contractors, estimators, students, and DIY project planning. Results are estimates for material planning and should be checked against project requirements.