Estimating & planning calculators

Measure once. Check the math. Buy the right amount.

Free calculators for construction, landscaping, lumber, and boat electrical work — every formula and assumption shown, no sign-up.

Square footage & cost the site's most-used calculation
Area432ft²
Square yards48.0yd²
Material cost$1,404

Handles waste, metric units, and multiple areas. Open the full calculator →

Most-used calculators

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Square footage calculatorArea & volume Concrete slab calculatorConcrete & masonry Concrete patio calculatorConcrete & masonry Concrete driveway calculatorConcrete & masonry Brick & block calculatorConcrete & masonry Roofing shingle calculatorRoofing & siding Siding calculatorRoofing & siding Roof pitch calculatorRoofing & siding Flooring calculatorFlooring Tile calculatorFlooring Epoxy floor calculatorFlooring Wall paint calculatorPaint Mulch calculatorLandscaping Gravel & topsoil calculatorLandscaping Paver calculatorLandscaping Sand calculatorLandscaping Sod calculatorLandscaping Drywall calculatorWalls & framing

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Area & volume 1 calculator Concrete & masonry 7 calculators Roofing & siding 3 calculators Flooring 3 calculators Paint 1 calculator Landscaping 5 calculators Walls & framing 5 calculators Decks, fences & stairs 4 calculators Lumber & woodworking 2 calculators Sitework & drainage 3 calculators Solar, battery & RV electrical 10 calculators Boat electrical & energy 1 calculator
Every formula is shownInputs, intermediate values, and unit conversions on each page.
Imperial and metricEnter either; results report both, with waste applied once.
Planning estimates, stated plainlyWhere a result isn't a code or engineering conclusion, the page says so.