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

USDA Forest Products Laboratory, Wood Handbook (board foot = 144 cubic inches)

Related

Deck Board Calculator

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Last reviewed 2026-10-11.