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.
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" | 0.5 | ||
| 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 |
Related Posts:
- Socket Sizes in Order From Smallest to Largest
- Best Combination Wrench Sets for the Job at Hand
- Best Allen Wrench and Hex Key Sets for Snug Fits Without Stripping
you should make another list like this for screwdrivers
Good idea. I’ll definitely add this to the queue.
there are thick nuts, thin nuts, wide nuts, etc. the wrench sizes here aren’t necessarily accurate.
Ty for doing it and standard and what metric it equals to makes it more convenient when I’m organizing my big wrenches on the wall I can put the standard wrench than the metric wrench right below it very helpful
Great charts they are very helpful thank you.
I am a woman that just lost her husband. I have all these wrenches and sockets that I do not know what size from another this site was a great tool for me and I will pass it on to other ladies
Thanks Bonnie. I’m so sorry for your loss.
Bonnie Wilson,
More and more Women have become DIY’ers, and they understand repair work quite easily. I hope that you put those tools to good use. I am very sorry for your loss.
Note; There are many “How To” videos on youtube. Try to learn from them. It’s easy, once you’ve seen others do it. (many of those videos, are by Women) Good Luck to you!
Kind Regards,
Joe Prete
Can you please update the chart to include 4.5, 5.5, 6.5mm? I know these are not as common anymore but I do have a few old sets with them. Along with some bold /32” mini wrenches that your chart is missing. A downloadable pdf of this cart would be great if you could provide it also! Thanks!
That’s a good idea. I’ll put it in the queue.