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Board Foot Calculator

Use this board foot calculator entirely in your browser.

ResultBoard feet including allowance: 88.00 bd ft

Measured lumber: 80.00 bd ft

10 boards × 2 in × 6 in × 8 ft

Waste allowance: 10.0%

Nominal versus actual dimensions, machining, defects, cut plans, and supplier units may change the quantity required.

Calculations happen locally in your browser.

How to use this calculator

  1. Enter the labelled values and review the live result.
  2. Review the live result and use Copy result when you need to share it.

How the calculation works

Board feet equal count × thickness in inches × width in inches × length in feet ÷ 12, plus the allowance entered.

Formula

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

Step-by-step calculation

  1. Enter the labelled values and review the live result.
  2. Board feet equal count × thickness in inches × width in inches × length in feet ÷ 12, plus the allowance entered.
  3. Check the displayed result, then copy it if needed.

Worked example

Ten boards measuring 2 in × 6 in × 8 ft equal 80 board feet before allowance.

Risk guidance

How board feet are measured

One board foot is a volume of 12 by 12 by 1 inches. The standard formula uses thickness and width in inches and length in feet.

Nominal and actual sizes differ

Planed lumber may be smaller than its nominal label. Confirm which dimensions, grade, defects, moisture condition, cut plan, and supplier units apply.

Frequently asked questions

Does this tool send my inputs anywhere?

No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.

How should I use the result?

Use it for early planning only. Verify measurements, definitions, current local requirements, and the complete design with the relevant authority and appropriately qualified professionals.

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