Wrench Sizes in Order from Smallest to Largest
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 fixed wrench set or ratcheting 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.
Related: Hex Key Sizes (Conversion Chart)
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).
CLICK HERE to download charts as a PDF
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 | ||
| 4.5mm | 0.177 | ||
| 3/16" | 0.188 | ||
| 5mm | 0.197 | ||
| 5.5mm | 0.216 | ||
| 7/32" | 0.219 | ||
| 6mm | 0.236 | ||
| 1/4" | 0.250 | ||
| 6.5mm | 0.256 | ||
| 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" | 0.500 | ||
| 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 | 5/8" and 16mm are close enough | |
| 16mm | 0.630 | ||
| 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" | 0.750 | ||
| 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" | 1.000 | ||
| 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 | ||
| 1-3/16" | 1.188 | ||
| 31mm | 1.221 | ||
| 1-1/4" | 1.250 | 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" and 38mm are close enough | |
| 1-1/2" | 1.500 | ||
| 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" | 1.750 | ||
| 45mm | 1.772 | ||
| 46mm | 1.811 | 1-13/16" and 46mm are close enough | |
| 1-13/16" | 1.813 | ||
| 47mm | 1.850 | ||
| 1-7/8" | 1.875 | ||
| 48mm | 1.890 | ||
| 49mm | 1.923 | ||
| 50mm | 1.969 | ||
| 2" | 2.000 | 2" and 51mm 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" and 57mm are close enough | |
| 2-1/4" | 2.250 | ||
| 58mm | 2.283 | ||
| 59mm | 2.323 | ||
| 60mm | 2.362 | ||
| 2-3/8" | 2.375 | ||
| 61mm | 2.402 | ||
| 62mm | 2.441 | ||
| 63mm | 2.480 | ||
| 2-1/2" | 2.500 |
Need to know what wrench size you’ll need for a specific diameter of bolt or nut? We’ve got you covered.
Related: 6 vs 12-Point Sockets (Common Uses)
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 |
See Also: Hole Saw Sizes Chart
