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Free construction calculators for contractors, builders, estimators, and homeowners. Every tool runs in your browser — no account, no subscription, your numbers never leave your device.

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Estimates are planning aids verify quantities against your local codes and supplier quotes.

Tool category

Framing, Carpentry & Roofing calculators

Stud walls, stair stringers, rafter lengths, board feet and roofing squares for the whole envelope. 5 free calculators below.

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  3. Framing, Carpentry & Roofing

5 calculators

Every tool below is free results update live as you type.

Roofing
Roof Pitch & Shingle CalculatorRoofing calculator that turns footprint and pitch into roofing squares, shingle bundles, and underlayment, with waste set by roof complexity. Free, no sign-up.Calculates: Roofing squaresUse tool
Stairs
Stair Stringer LayoutStair calculator that lays out riser count, unit rise, tread depth, and stringer length from total rise and run, with live IRC code checks. Free, no sign-up.Calculates: Riser countUse tool
Wall Framing
Stud Wall FramingStud calculator for wall framing at 16" or 24" O.C. — studs, plates, headers, kings, and cripples solved from wall length and openings. Free, no sign-up.Calculates: Stud countUse tool
Roofing
Rafter & Truss Cut Length CalculatorFraming calculator that sizes common rafters from span, pitch, and overhang — line length, plumb and seat cut angles, and stock size. Free, no sign-up.Calculates: Rafter lengthUse tool
Lumber Math
Board Feet CalculatorBoard foot calculator for lumber and hardwood pricing — enter thickness, width, length, and piece count for BF per piece and job totals. Free, no sign-up.Calculates: Board feetUse tool
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