Calculate lumber board feet from thickness and width in inches, length in feet and quantity. Use the result to compare rough or dimensional lumber volume.
Enter your measurements and material details.
Nominal and actual dressed lumber dimensions are not always the same; use the dimension required for the pricing convention.
A board foot is a volume equal to 144 cubic inches. With thickness and width in inches and length in feet, the standard shortcut is thickness × width × length ÷ 12 for one board, multiplied by quantity.
Enter dimensions according to how the lumber is being priced. Rough hardwood is often discussed in nominal thicknesses, while finished dimensions may be smaller after surfacing.
A volume of 144 cubic inches, such as a board 1 inch thick by 12 inches wide by 12 inches long.
Using nominal dimensions, about 13.33 board feet.
Use the convention your supplier uses for pricing.
No. Board foot includes thickness and is a volume measure.
Yes. Enter the piece quantity.
Using the example inputs shown in the calculator — Thickness (in) = 2, Width (in) = 8, Length (ft) = 10, Number of boards = 12 — the result is 160 board feet. This demonstrates the formula with a complete set of numbers rather than a hidden assumption.
The result breakdown also shows Piece count: 12; Per board: 13.33 bd ft. Replace the example values with field measurements and the exact product coverage, yield or package size you plan to buy.
For this board feet calculator, the inputs with the greatest practical effect are thickness, width and length. Recalculate when any of those change; do not reuse a result from a different room, run, layer depth or product specification.
Board Feet Calculator is intended to help with quantity planning and arithmetic. It does not inspect the site, choose structural dimensions, determine code compliance or replace manufacturer installation instructions. Conditions such as slope, substrate quality, moisture, soil, framing, access and workmanship can change the final amount required.
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