Lumber Calculator

Calculate board feet and total cost for lumber. Enter thickness, width, length, and quantity of boards.

Thickness (in)

Width (in)

Length (ft)

Qty

$/board ft

Enter lumber dimensions.

Board Foot Formula

Board Feet = (Thickness″ × Width″ × Length′) / 12

One board foot = 1 inch thick × 12 inches wide × 12 inches long (144 cubic inches).

Example: 2×6×8 ft → (2 × 6 × 8) / 12 = 8 board feet

Last updated: 2026-08-08