Construction tools
Lumber Size Metric Translator
Convert nominal softwoods (e.g. 2x4, 4x4) to actual finished dimensions in millimeters, centimeters, and inches.
Quick Answer: What is a 2x4 in mm?
The metric equivalent of a 2x4 lumber board is actually 38 × 89 mm (rounded from exactly 38.1 × 88.9 mm). In the United States, lumber is sold by its larger, green "nominal" size (2x4 inches), but after seasoning, kiln-drying, and planing smooth, its finished actual size is 1.5 × 3.5 inches.
Volume & Board-Feet Calculator
Actual Dimensions (mm):38 × 89 mm
Actual Dimensions (in):1-1/2" × 3-1/2"
Board Feet (Volume Measure):5.33 BF
Solid Wood Volume:0.0083 m³
Dimensional Lumber Database
| Nominal Size (US) | Actual Size (Inches) | Actual Size (Metric mm) |
|---|---|---|
| 1x2 | 3/4" × 1-1/2" | 19 × 38 mm |
| 1x3 | 3/4" × 2-1/2" | 19 × 64 mm |
| 1x4 | 3/4" × 3-1/2" | 19 × 89 mm |
| 1x6 | 3/4" × 5-1/2" | 19 × 140 mm |
| 1x8 | 3/4" × 7-1/4" | 19 × 184 mm |
| 1x10 | 3/4" × 9-1/4" | 19 × 235 mm |
| 1x12 | 3/4" × 11-1/4" | 19 × 286 mm |
| 2x2 | 1-1/2" × 1-1/2" | 38 × 38 mm |
| 2x3 | 1-1/2" × 2-1/2" | 38 × 64 mm |
| 2x4 | 1-1/2" × 3-1/2" | 38 × 89 mm |
| 2x6 | 1-1/2" × 5-1/2" | 38 × 140 mm |
| 2x8 | 1-1/2" × 7-1/4" | 38 × 184 mm |
| 2x10 | 1-1/2" × 9-1/4" | 38 × 235 mm |
| 2x12 | 1-1/2" × 11-1/4" | 38 × 286 mm |
| 4x4 | 3-1/2" × 3-1/2" | 89 × 89 mm |
| 4x6 | 3-1/2" × 5-1/2" | 89 × 140 mm |
| 6x6 | 5-1/2" × 5-1/2" | 140 × 140 mm |