Wrench Sizes in Order from Smallest to Largest

Note: This post may contain affiliate links. This means that at no cost to you, we may earn a small commission for qualifying purchases.

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 SizeMetric SizeInches DecimalNote
5/32"0.1565/32" and 4mm are
close enough
4mm0.157
4.5mm0.177
3/16"0.188
5mm0.197
5.5mm0.216
7/32"0.219
6mm0.236
1/4"0.250
6.5mm0.256
7mm0.276
9/32"0.281
5/16"0.3135/16" and 8mm are
close enough
8mm0.315
11/32"0.344
9mm0.354
3/8"0.375
10mm0.394
13/32"0.406
11mm0.4337/16" and 11mm are
close enough
7/16"0.438
15/32"0.46915/32" and 12mm are
close enough
12mm0.472
1/2"0.5
13mm0.512
17/32"0.531
14mm0.551
9/16"0.563
15mm0.59119/32" and 15mm are
close enough
19/32"0.594
5/8"0.625
16mm0.63
21/32"0.656
17mm0.669
11/16"0.688
18mm0.709
23/32"0.719
19mm0.7483/4" and 19mm are
close enough
3/4"0.75
25/32"0.781
20mm0.787
13/16"0.813
21mm0.827
27/32"0.844
22mm0.866
7/8"0.875
23mm0.90629/32" and 23mm are
close enough
29/32"0.906
15/16"0.938
24mm0.945
25mm0.984
1"1
26mm1.024
1-1/16"1.0631-1/16" and 27mm are
close enough
27mm1.063
28mm1.102
1-1/8"1.125
29mm1.142
30mm1.181
31mm1.221
1-1/4"1.251-1/4" and 32mm are
close enough
32mm1.256
33mm1.299
1-5/16"1.313
34mm1.339
1-3/8"1.3751-3/8" and 35mm are
close enough
35mm1.378
36mm1.417
1-7/16"1.438
37mm1.457
38mm1.496
1-1/2"1.5
39mm1.535
40mm1.575
41mm1.614
1-5/8"1.625
42mm1.654
1-11/16"1.6881-11/16" and 43mm are
close enough
43mm1.693
44mm1.733
1-3/4"1.75
45mm1.772
46mm1.811
1-13/16"1.813
47mm1.85
1-7/8"1.875
48mm1.89
49mm1.923
50mm1.969
2"22" and 52mm are
close enough
51mm2.008
52mm2.047
2-1/16"2.063
53mm2.087
2-1/8"2.1252-1/8" and 54mm are
close enough
54mm2.126
55mm2.165
2-3/16"2.188
56mm2.205
57mm2.244
2-1/4"2.25
58mm2.283
59mm2.323
60mm2.362
2-3/8"2.375
61mm2.402
62mm2.441
63mm2.48
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 DiameterWrench 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:

Comments

  1. 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

    Reply
    • Thank you so much for doing these charts. Multiple concussions have made my brain into mush.

      I used to help my father and assorted grease monkey friends work on their cars, bikes etc. And I know that I am extremely OCD about keeping my tools in order. My father taught me that.

      * NOTE- Never ever lend out your tools. If you’re lucky enough to get them back, they will be trashed.

      Mine were recently returned after over a month in a large zip lock bag. Somehow the person managed to lose a few. I know, that happens. Oh well. C’est la vie. But how’d they lose my holder’s is beyond my understanding?

      Your chart has been a phenomenal help today as I attempt to clean and reorganize my socket sets. I wish that the part of my brain that used to be able to figure out the sizes would be with me still.

      Obviously you have it. Again, thank you.

      Reply
      • Glad these were helpful. I have a little OCD in me as well. Can’t remember how many different chart formats I tried before deciding on the ones here (and I still wonder if there’s a better way of doing them!). I agree about your rule on lending out tools but over time, you tend to accumulate duplicates of certain tools which definitely helps. 🙂

        Reply
  2. 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

    Reply
  3. 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

    Reply
  4. 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!

    Reply

Leave a Comment

shares