Structural Lumber - Section Sizes
Reference tool for structural lumber section sizes and properties
| Nominal Size (in) | Actual Width (in) | Actual Depth (in) | Cross-Sectional Area (in²) | Section Modulus (in³) | Moment of Inertia (in⁴) |
|---|---|---|---|---|---|
| 2x4 | 1.5 | 3.5 | 5.25 | 3.06 | 5.36 |
| 2x6 | 1.5 | 5.5 | 8.25 | 7.56 | 20.8 |
| 2x8 | 1.5 | 7.5 | 11.25 | 13.14 | 47.63 |
| 2x10 | 1.5 | 9.5 | 14.25 | 21.39 | 98.93 |
| 2x12 | 1.5 | 11.5 | 17.25 | 31.64 | 177.98 |
| 4x4 | 3.5 | 3.5 | 12.25 | 7.15 | 12.51 |
| 4x6 | 3.5 | 5.5 | 19.25 | 17.65 | 48.53 |
| 4x8 | 3.5 | 7.5 | 26.25 | 30.66 | 111.15 |
| 4x10 | 3.5 | 9.5 | 33.25 | 49.91 | 230.84 |
| 4x12 | 3.5 | 11.5 | 40.25 | 73.83 | 415.28 |
| 6x6 | 5.5 | 5.5 | 30.25 | 27.73 | 76.26 |
| 6x8 | 5.5 | 7.5 | 41.25 | 51.56 | 192.88 |
| 6x10 | 5.5 | 9.5 | 52.25 | 82.73 | 392.38 |
| 6x12 | 5.5 | 11.5 | 63.25 | 121.23 | 696.67 |
| 8x8 | 7.5 | 7.5 | 56.25 | 70.31 | 263.67 |
| 8x10 | 7.5 | 9.5 | 71.25 | 112.81 | 535.86 |
| 8x12 | 7.5 | 11.5 | 86.25 | 165.98 | 955.8 |
| 10x10 | 9.5 | 9.5 | 90.25 | 142.89 | 678.48 |
| 10x12 | 9.5 | 11.5 | 109.25 | 209.39 | 1204 |
| 12x12 | 11.5 | 11.5 | 132.25 | 253.48 | 1457.25 |