Calculators
Construction calculators that show their work.
Free residential construction calculators for trades and finance. Each one shows the formula, the assumptions, and where the typical waste factors come from.
Trade estimators
Roofing
Estimate roof area, squares, bundles of shingles, and waste factor for residential roofs from footprint and pitch.
Concrete
Calculate cubic yards of concrete for slabs, footings, and piers including a 10% waste factor.
Siding
Estimate square footage of siding from wall dimensions, openings, and waste factor for lap, board-and-batten, and panel siding.
Flooring
Estimate square feet, boxes, and waste factor for hardwood, LVP, tile, and carpet from room dimensions.
Drywall
Calculate the number of 4x8, 4x10, and 4x12 drywall sheets, plus mud and tape for a residential project.
Paint
Calculate gallons of paint required for interior or exterior surfaces from square footage and coat count.
Framing
Estimate board feet, stud counts, and lumber package size for residential framing from wall length and stud spacing.