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 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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