Framing & Structural Calculators

Board feet, plywood sheets, rafters, and joist spans for framing work.

Free, no sign-up5 calculators

Convert lumber dimensions into board feet for ordering and pricing.

Figure out how many plywood or OSB sheets you need for a given area.

Find rafter length and roof angle from run and roof pitch.

Get total rafter length from building span, pitch, overhang, and ridge thickness.

Estimate maximum allowable floor joist span by size, species, and spacing.

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