We all have a mix of wrenches in our tool boxes. Some of us have a lot of SAE, others have a full range of metric and most of us have a balanced mix of both.
Whatever your setup, our wrench conversion chart will tell you the best fitting standard or metric wrench to use for any given bolt.
Metric / Standard Wrench Conversion Chart
| Bolt Diameter | Metric | Standard |
| 1/8" | 8mm | 5/16" |
| 3/16" | 10mm | 3/8" |
| 1/4" | 11mm | 7/16" |
| 5/16" | 13mm | 1/2" |
| 3/8" | 14mm | 9/16" |
| 7/16" | 16mm | 5/8" |
| 1/2" | 19mm | 3/4" |
| 9/16" | 21mm | 13/16" |
| 22mm | 7/8" | |
| 5/8" | 24mm | 15/16" |
| 25mm | 1" | |
| 3/4" | 29mm | 1-1/8" |
| 32mm | 1-1/4" | |
| 7/8" | 34mm | 1-5/16" |
| 35mm | 1-3/8" | |
| 1" | 38 mm | 1-1/2" |
| 41mm | 1-5/8" | |
| 1-1/8" | 43mm | 1-11/16" |
| 45mm | 1-3/4" | |
| 1-1/4" | 48mm | 1-7/8" |
| 1-3/8" | 51mm | 2" |
| 1-1/2" | 57mm | 2-1/4" |
| 1-5/8" | 64mm | 2-1/2" |
| 1-3/4" | 67mm | 2-5/8" |
| 70mm | 2-3/4" | |
| 1-7/8" | 75mm | 2-15/16" |
| 76mm | 3" | |
| 2" | 80mm | 3-1/8" |
| 83mm | 3-1/4" | |
| 2-1/4" | 89mm | 3-1/2" |
| 95mm | 3-3/4" | |
| 2-1/2" | 99mm | 3-7/8" |
| 102mm | 4" | |
| 2-3/4" | 108mm | 4-1/4" |
| 114mm | 4-1/2" | |
| 3" | 118mm | 4-5/8" |
| 3-1/4" | 127mm | 5" |
| 3-1/2" | 137mm | 5-3/8" |
| 140mm | 5-1/2" | |
| 3-3/4" | 146mm | 5-3/4" |
| 152mm | 6" | |
| 165mm | 6-1/2" | |
| 178mm | 7" |
