Construction calculators

Estimate materials and costs for building projects: concrete, drywall, lumber, paint, roofing, tile and more. Every estimator includes a waste allowance so you order the right quantity first time.

Popular Construction Calculators

• Concrete Calculator — Calculate the amount of concrete needed for your project.
• Asphalt Calculator — Calculate the amount of asphalt needed for paving projects.
• Rebar Calculator — Calculate rebar quantity and spacing for concrete reinforcement.
• Gear Ratio Calculator — Calculate gear ratios for mechanical systems.
• Belt Length Calculator — Calculate belt length for pulley systems.
• Spring Rate Calculator — Calculate spring rate and deflection for spring design.
• Torque Calculator — Calculate torque from force and distance.
• Horsepower Calculator — Calculate horsepower from torque and RPM.
• Fluid Flow Calculator — Calculate fluid flow rate in pipes and channels.
• Pipe Pressure Drop Calculator — Calculate pressure drop in pipes due to friction.

All calculators are accurate, require no signup, and run entirely in your browser. Browse all calculators →