Board Feet Calculator (Lumber)

By in
Updated October 27, 2026
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How to use this calculator

Enter thickness and width in inches, length in feet, the quantity and the price per board foot. Total board feet and cost are calculated.

Formula

Board feet = thickness (in) × width (in) × length (ft) ÷ 12

Example

Ten 2 × 6 in boards, 8 ft long, at 4.50 per board foot:

  • Board feet = 2 × 6 × 8 ÷ 12 × 10 = 80
  • Cost = 360.00

Frequently asked questions

What is a board foot?

A volume of wood 1 inch thick, 12 inches wide and 1 foot long (144 cubic inches).

Do I use nominal or actual size?

Hardwood is usually priced on nominal rough-sawn thickness (such as 4/4 = 1 in). Check how your supplier measures.

How many board feet in a cubic metre?

About 423.8 board feet.

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