Lumber & Board Foot Calculator
Calculate board feet, linear feet, cubic metres and total lumber cost from nominal thickness, width, length and quantity.
Total board feet
53.33
Per piece
5.33
Linear feet
80.0
Cubic metres
0.126
Nominal vs actual lumber sizes
Board feet are billed on nominal dimensions, but a “2 × 4” actually measures 1.5 × 3.5 inches after surfacing and drying (US PS 20 standard). Use nominal figures above for pricing and actual figures for framing layout.
| Nominal (in) | Actual (in) | Actual (mm) |
|---|---|---|
| 1 × 2 | 0.75 × 1.5 | 19.0 × 38.1 |
| 1 × 4 | 0.75 × 3.5 | 19.0 × 88.9 |
| 1 × 6 | 0.75 × 5.5 | 19.0 × 139.7 |
| 2 × 2 | 1.5 × 1.5 | 38.1 × 38.1 |
| 2 × 4 | 1.5 × 3.5 | 38.1 × 88.9 |
| 2 × 6 | 1.5 × 5.5 | 38.1 × 139.7 |
| 2 × 8 | 1.5 × 7.25 | 38.1 × 184.1 |
| 2 × 10 | 1.5 × 9.25 | 38.1 × 234.9 |
| 2 × 12 | 1.5 × 11.25 | 38.1 × 285.8 |
| 4 × 4 | 3.5 × 3.5 | 88.9 × 88.9 |
| 6 × 6 | 5.5 × 5.5 | 139.7 × 139.7 |
Formula
Board feet = thickness(in) × width(in) × length(ft) ÷ 12
One board foot equals 1/12 ft³ = 0.002359737216 m³ = 2.359737216 litres.
Cite this page
UnitConvertLab. (2026). Lumber & Board Foot Calculator. UnitConvertLab. Retrieved from https://unitconvertlab.com/fr/tools/lumber-calculator