Board Foot Calculator (Lumber)
Board foot calculator: board feet of lumber from thickness and width in inches and length in feet, plus the volume.
BF = T(in) · W(in) · L(ft)12
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
Board feet = thickness (in) × width (in) × length (ft) ÷ 12. One board foot is 144 in³. Use nominal sizes if your yard prices that way.
Formula
BF = T(in) · W(in) · L(ft)12
| Symbol | Quantity | Units |
|---|---|---|
| T | Thickness | m, km, cm, mm, µm, nm, pm, Å, in, ft, yd, mi, nmi, au, ly |
| W | Width | m, km, cm, mm, µm, nm, pm, Å, in, ft, yd, mi, nmi, au, ly |
| L | Length | m, km, cm, mm, µm, nm, pm, Å, in, ft, yd, mi, nmi, au, ly |
| BF | Board feet | — |
Worked example
Given: T = 2 in · W = 6 in · L = 8 ft
BF = T W L12
Result: BF = 8
Board feet for different values of Thickness
| T · Thickness | BF · Board feet |
|---|---|
| 1 in | 4 |
| 1.5 in | 6 |
| 1.8 in | 7.2 |
| 2 in | 8 |
| 2.2 in | 8.8 |
| 2.5 in | 10 |
| 3 in | 12 |
| 4 in | 16 |
Other values as in the worked example.
Frequently asked questions
A 2 × 6 that is 8 ft long?
8 board feet.
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