Board Foot Calculator
Updated Formulas shown
A board foot is 144 in³ — a board 1 in thick, 12 in wide and 1 ft long. Ten 1 × 6 × 8 ft boards are 40 board feet.
Board feet
40 bf
- Per piece
- 4 bf
- Cubic feet
- 3.333 ft³
- Linear feet
- 80 ft
Board feet use nominal thickness for rough lumber (e.g. 4/4 = 1 in). Formula: T × W × L(ft) ÷ 12.
The formula
Board feet = thickness (in) × width (in) × length (ft) ÷ 12.
Quick reference
| Size | 6 ft | 8 ft | 10 ft | 12 ft | 16 ft |
|---|---|---|---|---|---|
| 1 × 4 | 2 | 2.67 | 3.33 | 4 | 5.33 |
| 1 × 6 | 3 | 4 | 5 | 6 | 8 |
| 1 × 8 | 4 | 5.33 | 6.67 | 8 | 10.67 |
| 2 × 4 | 4 | 5.33 | 6.67 | 8 | 10.67 |
| 2 × 6 | 6 | 8 | 10 | 12 | 16 |
| 2 × 8 | 8 | 10.67 | 13.33 | 16 | 21.33 |
| 2 × 10 | 10 | 13.33 | 16.67 | 20 | 26.67 |
| 2 × 12 | 12 | 16 | 20 | 24 | 32 |
| 4 × 4 | 8 | 10.67 | 13.33 | 16 | 21.33 |
| 6 × 6 | 18 | 24 | 30 | 36 | 48 |
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Frequently asked questions
How do I calculate board feet for a 2x4?
Using nominal sizes, a 2 × 4 × 8 ft is 2 × 4 × 8 ÷ 12 = 5.33 board feet.
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Estimates only. Check quantities with your supplier or contractor before ordering.