Wrench Sizes in Order from Smallest to Largest

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Updated on September 6, 2021

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 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"0.500
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"0.6255/8" and 16mm are
close enough
16mm0.630
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"0.750
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"1.000
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
1-3/16"1.188
31mm1.221
1-1/4"1.2501-1/4" 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
38mm1.4961-1/2" and 38mm are
close enough
1-1/2"1.500
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"1.750
45mm1.772
46mm1.8111-13/16" and 46mm are
close enough
1-13/16"1.813
47mm1.850
1-7/8"1.875
48mm1.890
49mm1.923
50mm1.969
2"2.0002" and 51mm 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
57mm2.2442-1/4" and 57mm are
close enough
2-1/4"2.250
58mm2.283
59mm2.323
60mm2.362
2-3/8"2.375
61mm2.402
62mm2.441
63mm2.480
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 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

See Also: Hole Saw Sizes Chart

34 thoughts on “Wrench Sizes in Order from Smallest to Largest”

  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
  5. I love these charts. A have had to fin for myself for a long while now doing things that I never had to do. Learning all about tools and such. This is a great help. Thanks.

    Reply
  6. i dont know what YOU use wrenches on, but I work on anything automotive and one thing is for sure … 14mm and 9/16″ are unmistakebly identical and this you do not recognize in ur charts ?? Others are comparebly close

    Reply
    • Good comment. I didn’t include 14mm and 9/16″ as a good conversion since they’re far enough apart where one tool brand may work while another will be too tight/loose due to a tolerance difference. I’m sure I’ve used one over the other at some point when in a pinch but the size difference is a bit too much to recommend as a “close enough” recommendation.

      Reply
  7. Very helpful chart. I have very many wrenches and sockets that have been collected over the past 50 years, mine, my fathers, my brothers and who knows who elses. They’ve been thrown together in different containers over the years, but now I am going to build an organizer for them so they can be arranged in size order. This will make my looking for tool sizes a lot easier. Thanks for this chart, I’ll use it to arrange the tools.

    Reply
  8. I know it also matters on the sockets if its as 6 point or 12 point rather it’s a metric or standard on if its gonna fit snug or not. Plus also, is it well used socket or wrench or if its fairly new. The more it’s used the less chance of it bring snug.

    Reply
  9. The place where I worked was mostly standard sized but the newer equipment was coming in as metric so I added the following metric sizes to fill in the holes in my sets.
    6mm, 10mm, 13mm, 16mm, 18mm, 21mm and 24mm. These sizes really don’t have standard equivalents and with this I had 1 set to rule them all.

    Reply
  10. This is a very helpful website, it has helped me to organize a put together all the sockets and wrenches together by drive and socket, and size. Now my dad won’t have to go digging around in the tool box looking for the right size socket and driver. Very helpful thanks for the information. It’s people like this that makes my life a whole lot more simple.

    Reply
  11. Is there a term for the size ranges, say 1/4″ through 1″ as “standard” an 1-1/16 up to (?) as “Large”. Wrench manufacturers don’t seem to differentiate.

    My son is a Millwright an I’d like to get him a complet-ish set for Christmas.

    Reply

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