Board Foot Calculator (Lumber)
Board feet and cost for hardwood or dimensional lumber.
Formula
Board feet = thickness(in) × width(in) × length(ft) ÷ 12 × pieces (one board foot = 144 cubic inches).
Worked example
Inputs: Thickness = 1 in; Width = 6 in; Length = 8 ft; Pieces = 10; Price per board foot (0 = skip) = 0 $.
| Board feet | 40 |
|---|---|
| Cost | — |
FAQ
Nominal or actual size?
Hardwood is usually sold by nominal rough thickness (e.g. 4/4 = 1 in); use what your yard prices on.
Sources
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Last reviewed 2026-10-11.