Board Foot Calculator
Calculate lumber volume in board feet for woodworking and construction projects.
What is a Board Foot?
A board foot is a unit of volume for lumber equal to:
1 board foot = 1″ (thickness) × 12″ (width) × 12″ (length)
Board Foot Formula
Board Feet = (Thickness (in) × Width (in) × Length (ft)) ÷ 12
Common Lumber Dimensions
| Nominal Size | Actual Size | Board Feet per 8′ |
|---|---|---|
| 1×4 | 0.75″ × 3.5″ | 2.33 |
| 2×4 | 1.5″ × 3.5″ | 4.67 |
| 1×6 | 0.75″ × 5.5″ | 3.5 |
| 2×6 | 1.5″ × 5.5″ | 7.0 |
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