Wrench sizes are a bit easier to figure out than socket sizes since you are not dealing with different ratchet drive sizes. While the average wrench set won’t include every single size of wrench, you’ll likely only use a few of them depending on the general use.
A car mechanic will use a large range of wrench sizes while someone who works on bicycles or farming equipment may only use a small number of sizes. Here are Standard (SAE) and Metric wrench sizes (from smallest to largest) that can often be found as part of a set or individually.
Note: Along with each size is the decimal equivalent (in inches) so you can compare applies to apples when trying to determine if a metric size wrench is close enough to its SAE equivalent (and vice versa).
Wrench Size Conversion Chart (SAE to Metric)
| SAE Size | Metric Size | Inches Decimal | Note |
|---|---|---|---|
| 5/32" | 0.156 | 5/32" and 4mm are close enough |
|
| 4mm | 0.157 | ||
| 3/16" | 0.188 | ||
| 5mm | 0.197 | ||
| 7/32" | 0.219 | ||
| 6mm | 0.236 | ||
| 1/4" | 0.25 | ||
| 7mm | 0.276 | ||
| 9/32" | 0.281 | ||
| 5/16" | 0.313 | 5/16" and 8mm are close enough |
|
| 8mm | 0.315 | ||
| 11/32" | 0.344 | ||
| 9mm | 0.354 | ||
| 3/8" | 0.375 | ||
| 10mm | 0.394 | ||
| 13/32" | 0.406 | ||
| 11mm | 0.433 | 7/16" and 11mm are close enough |
|
| 7/16" | 0.438 | ||
| 15/32" | 0.469 | 15/32" and 12mm are close enough |
|
| 12mm | 0.472 | ||
| 1/2" | 0.5 | ||
| 13mm | 0.512 | ||
| 17/32" | 0.531 | ||
| 14mm | 0.551 | ||
| 9/16" | 0.563 | ||
| 15mm | 0.591 | 19/32" and 15mm are close enough |
|
| 19/32" | 0.594 | ||
| 5/8" | 0.625 | ||
| 16mm | 0.63 | ||
| 21/32" | 0.656 | ||
| 17mm | 0.669 | ||
| 11/16" | 0.688 | ||
| 18mm | 0.709 | ||
| 23/32" | 0.719 | ||
| 19mm | 0.748 | 3/4" and 19mm are close enough |
|
| 3/4" | 0.75 | ||
| 25/32" | 0.781 | ||
| 20mm | 0.787 | ||
| 13/16" | 0.813 | ||
| 21mm | 0.827 | ||
| 27/32" | 0.844 | ||
| 22mm | 0.866 | ||
| 7/8" | 0.875 | ||
| 23mm | 0.906 | 29/32" and 23mm are close enough |
|
| 29/32" | 0.906 | ||
| 15/16" | 0.938 | ||
| 24mm | 0.945 | ||
| 25mm | 0.984 | ||
| 1" | 1 | ||
| 26mm | 1.024 | ||
| 1-1/16" | 1.063 | 1-1/16" and 27mm are close enough |
|
| 27mm | 1.063 | ||
| 28mm | 1.102 | ||
| 1-1/8" | 1.125 | ||
| 29mm | 1.142 | ||
| 30mm | 1.181 | ||
| 31mm | 1.221 | ||
| 1-1/4" | 1.25 | 1-1/4" and 32mm are close enough |
|
| 32mm | 1.256 | ||
| 33mm | 1.299 | ||
| 1-5/16" | 1.313 | ||
| 34mm | 1.339 | ||
| 1-3/8" | 1.375 | 1-3/8" and 35mm are close enough |
|
| 35mm | 1.378 | ||
| 36mm | 1.417 | ||
| 1-7/16" | 1.438 | ||
| 37mm | 1.457 | ||
| 38mm | 1.496 | ||
| 1-1/2" | 1.5 | ||
| 39mm | 1.535 | ||
| 40mm | 1.575 | ||
| 41mm | 1.614 | ||
| 1-5/8" | 1.625 | ||
| 42mm | 1.654 | ||
| 1-11/16" | 1.688 | 1-11/16" and 43mm are close enough |
|
| 43mm | 1.693 | ||
| 44mm | 1.733 | ||
| 1-3/4" | 1.75 | ||
| 45mm | 1.772 | ||
| 46mm | 1.811 | ||
| 1-13/16" | 1.813 | ||
| 47mm | 1.85 | ||
| 1-7/8" | 1.875 | ||
| 48mm | 1.89 | ||
| 49mm | 1.923 | ||
| 50mm | 1.969 | ||
| 2" | 2 | 2" and 52mm are close enough |
|
| 51mm | 2.008 | ||
| 52mm | 2.047 | ||
| 2-1/16" | 2.063 | ||
| 53mm | 2.087 | ||
| 2-1/8" | 2.125 | 2-1/8" and 54mm are close enough |
|
| 54mm | 2.126 | ||
| 55mm | 2.165 | ||
| 2-3/16" | 2.188 | ||
| 56mm | 2.205 | ||
| 57mm | 2.244 | ||
| 2-1/4" | 2.25 | ||
| 58mm | 2.283 | ||
| 59mm | 2.323 | ||
| 60mm | 2.362 | ||
| 2-3/8" | 2.375 | ||
| 61mm | 2.402 | ||
| 62mm | 2.441 | ||
| 63mm | 2.48 | ||
| 2-1/2" | 2.5 |
Need to know what wrench size you’ll need for a specific diameter of bolt or nut? We’ve got you covered.
Wrench Size Chart for Bolts
| Bolt Diameter | Wrench Size (Standard) | Wrench Size (Metric) |
|---|---|---|
| 1/8" | 5/16" | 8mm |
| 3/16" | 3/8" | 10mm |
| 1/4" | 7/16" | 11mm |
| 5/16" | 1/2" | 13mm |
| 3/8" | 9/16" | 15mm |
| 7/16" | 5/8" | 16mm |
| 1/2" | 3/4" | 19mm |
| 9/16" | 13/16" | 21mm |
| 5/8" | 15/16" | 24mm |
| 3/4" | 1-1/8" | 29mm |
| 7/8" | 1-5/16" | 34mm |
| 1" | 1-1/2" | 38mm |
| 1-1/8" | 1-11/16" | 43mm |
| 1-1/4" | 1-7/8" | 48mm |
| 1-3/8" | 2-1/16" | 53mm |
| 1-1/2" | 2-1/4" | 58mm |
| 1-5/8" | 2-7/16" | 62mm |
| 1-3/4" | 2-5/8" | 67mm |
| 1-7/8" | 2-13/16" | 72mm |
| 2" | 3" | 77mm |
| 2-1/4" | 3-3/8" | 86mm |
| 2-1/2" | 3-3/4" | 96mm |
| 2-3/4" | 4-1/8" | 105mm |
| 3" | 4-1/2" | 115mm |
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