Lumber Size Guide
Lumber is sold by nominal (stated) size, but actual dimensions are smaller due to drying and milling. Use the actual dimensions for your calculations.
| Nominal Size | Actual Size (in) | Actual Size (mm) |
|---|---|---|
| 1×2 | 3/4 × 1-1/2 | 19 × 38 |
| 1×4 | 3/4 × 3-1/2 | 19 × 89 |
| 1×6 | 3/4 × 5-1/2 | 19 × 140 |
| 1×8 | 3/4 × 7-1/4 | 19 × 184 |
| 1×10 | 3/4 × 9-1/4 | 19 × 235 |
| 1×12 | 3/4 × 11-1/4 | 19 × 286 |
| 2×2 | 1-1/2 × 1-1/2 | 38 × 38 |
| 2×4 | 1-1/2 × 3-1/2 | 38 × 89 |
| 2×6 | 1-1/2 × 5-1/2 | 38 × 140 |
| 2×8 | 1-1/2 × 7-1/4 | 38 × 184 |
| 2×10 | 1-1/2 × 9-1/4 | 38 × 235 |
| 2×12 | 1-1/2 × 11-1/4 | 38 × 286 |
| 4×4 | 3-1/2 × 3-1/2 | 89 × 89 |
| 4×6 | 3-1/2 × 5-1/2 | 89 × 140 |
| 6×6 | 5-1/2 × 5-1/2 | 140 × 140 |