Board Foot Calculator: Lumber Volume

Calculate lumber board feet from thickness and width in inches, length in feet and whole-piece count. Includes worked examples and nominal-size guidance.

Your Numbers

Thickness (in)in

Width (in)in

Length (ft)ft

Piecespieces

Results

Lumber volume (board feet)—

Input check—

Results update live as you type. Estimates only — not financial, tax, or investment advice.

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The Formula

Board feet = thickness inches × width inches × length feet × pieces ÷ 12

Understanding the Board Foot Calculator: Lumber Volume

Worked example: ten pieces measuring 2 inches thick, 6 inches wide and 8 feet long total (2 × 6 × 8 × 10) ÷ 12 = 80 board feet.

One board foot is 144 cubic inches, equivalent to a board 1 inch thick, 12 inches wide and 1 foot long. This is volume, not linear feet or surface area.

Specify whether your lumber supplier prices using nominal or actual dimensions. For example, substituting 1.5 × 5.5 inches for 2 × 6 changes the volume estimate; the calculator cannot decide which basis your purchase requires.

Frequently Asked Questions

How is the result calculated?

Board feet = thickness inches × width inches × length feet × pieces ÷ 12

What assumptions should I check?

Use dimensions appropriate to the seller’s pricing convention; nominal and actual dimensions differ.