Wrench Size Conversion Chart – Metric (mm) to SAE (Inches)
Convert between metric and SAE (inch) wrench sizes with this comprehensive comparison chart. Find the closest equivalent sizes for your tools, whether working with US standard (SAE) or metric fasteners.
| Standard SAE U.S. Wrench/Spanner Size (inches) | Metric Wrench/Spanner Size (mm) |
|---|---|
| 1/8 | 3.18 |
| 5/32 | 3.97 |
| 4 | |
| 3/16 | 4.76 |
| 5 | |
| 13/64 | 5.16 |
| 7/32 | 5.56 |
| 15/64 | 6.05 |
| 6 | |
| 1/4 | 6.35 |
| 17/64 | 6.75 |
| 7 | |
| 9/32 | 7.14 |
| 5/16 | 7.94 |
| 8 | |
| 11/32 | 8.73 |
| 9 | |
| 3/8 | 9.53 |
| 10 | |
| 11 | |
| 7/16 | 11.11 |
| 15/32 | 11.91 |
| 12 | |
| 1/2 | 12.7 |
| 13 | |
| 17/32 | 13.49 |
| 14 | |
| 9/16 | 14.29 |
| 15 | |
| 19/32 | 15.08 |
| 5/8 | 15.88 |
| 16 | |
| 21/32 | 16.67 |
| 17 | |
| 11/16 | 17.46 |
| 18 | |
| 19 | |
| 3/4 | 19.05 |
| 25/32 | 19.84 |
| 20 | |
| 13/16 | 20.64 |
| 21 | |
| 22 | |
| 7/8 | 22.23 |
| 23 | |
| 29/32 | 23.02 |
| 15/16 | 23.81 |
| 24 | |
| 31/32 | 24.61 |
| 25 | |
| 1 | 25.40 |
| 26 | |
| 1 1/16 | 26.99 |
| 27 | |
| 28 | |
| 1 1/8 | 28.58 |
| 29 | |
| 30 | |
| 1 3/16 | 30.16 |
| 31 | |
| 1 1/4 | 31.75 |
| 32 | |
| 33 | |
| 1 5/16 | 33.34 |
| 34 | |
| 1 3/8 | 34.93 |
| 35 | |
| 36 | |
| 1 7/16 | 36.51 |
| 38 | |
| 1 1/2 | 38.10 |
| 39 | |
| 1 9/16 | 39.69 |
| 40 | |
| 41 | |
| 1 5/8 | 41.28 |
| 1 11/16 | 42.86 |
| 1 3/4 | 44.45 |
| 46 | |
| 1 13/16 | 46.04 |
| 1 7/8 | 47.63 |
| 1 15/16 | 49.21 |
| 50 | |
| 2 | 50.80 |
| 51 | |
| 2 1/8 | 53.96 |
| 54 | |
| 2 1/4 | 57.15 |
| 2 3/8 | 60.33 |
| 2 1/2 | 63.5 |
- 1 inch = 25.4 mm
- 1 mm = 0.0394 inch
- Length Units Converter
