Construction Calculators
Estimate concrete, lumber, roofing, and structural loads.
227 free calculators
Measure Twice, Calculate Once
Construction math is unforgiving. Order too little concrete and you're paying for a second delivery. Overestimate lumber and you're eating the cost of materials you don't need. These calculators handle the unit conversions, waste factors, and material formulas that contractors and DIYers deal with on every project.
Most Popular Tools
The board foot calculator is the most-used tool in this section — board feet are how lumber is priced, but almost nobody can do the conversion in their head. For concrete work, start with the concrete volume calculator to figure out how many cubic yards you need, then use the concrete price calculator to estimate cost. Roofers consistently reach for the roof slope calculator, which handles pitch-to-angle conversions and helps estimate material coverage for sloped surfaces.
For the Full Project
A real build involves more than one trade. You'll find structural load calculators, wire gauge tools, and pipe sizing calculators spread across this section. If your project involves electrical work, check our physics calculators for voltage, resistance, and power formulas. For cost estimation and budgeting across multiple line items, the personal finance section has tools for comparing per-unit costs and tracking expenses.