Wrench Sizes in Order from Smallest to Largest

Wrench sizes are a bit easier to figure out than socket sizes┬ásince 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 SizeMetric SizeInches DecimalNote
5/32"0.1565/32" and 4mm are
close enough
4mm0.157
3/16"0.188
5mm0.197
7/32"0.219
6mm0.236
1/4"0.25
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

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