Board Feet Calculator

Convert lumber dimensions into board feet for accurate purchasing and pricing. Supports multiple board sizes and quantity inputs.

Board feet is the standard volume measurement for pricing lumber, especially hardwoods. The formula is simple — thickness (in.) × width (in.) × length (ft.) ÷ 12 — but doing it across multiple board sizes and quantities is tedious by hand. This calculator lets you enter multiple line items and totals the board feet for your order.

Frequently Asked Questions

What is a board foot?

A board foot is a volume measurement equal to 1 inch thick × 12 inches wide × 12 inches long (144 cubic inches). It is the standard unit for pricing hardwood lumber and some specialty softwood.

Do I use nominal or actual dimensions?

Board feet are calculated using nominal dimensions (e.g., 2×6, not 1.5×5.5). This is the industry standard for lumber pricing.

When is board feet pricing used vs. linear feet?

Hardwood lumber and custom-milled softwood are typically sold by the board foot. Dimensional framing lumber (2×4, 2×6, etc.) at home centers is usually priced per linear foot or per piece.

Estimates are for planning purposes only. Verify quantities with your supplier and confirm code requirements with your local building department.