Calculator
Board foot calculator
Work out how many board feet a board or a cut list needs. Use the formula by hand, or enter sizes below for a running total.
Cut list
JavaScript is off, so this page cannot total the fields automatically. Use the formula and worked example below, or turn JavaScript on for a live cut-list total.
Line 1
Extra percent for defects and milling, for example 15 or 20. Leave blank for none.
Total board feet —
Total with waste —
Enter thickness, width, length, and quantity greater than zero.
This tool is for planning. Results are estimates, and real boards vary in thickness, width, and defects, so buy a little extra. Measure twice before you cut.
The formula
Board feet = (thickness × width × length × quantity) ÷ 144, with thickness, width, and length in inches. One board foot is a volume of 144 cubic inches — for example a board 1″ thick, 12″ wide, and 12″ long.
Lumber yards often price rough stock using nominal thickness in inches (for example 1″ for 4/4). If you are matching a quoted price, use the same thickness convention the seller uses. Finished (S4S) thickness is usually less than nominal.
Worked example
Two pieces, each ¾″ × 5½″ × 48″: (0.75 × 5.5 × 48 × 2) ÷ 144 = 2.75 board feet.
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