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Metal Gauge Thickness Conversion Chart

While the below information can be used as a rough guide always check the actual listed type of gauge used from your supplier. There seems to be a lot of variance in what gauge is used.

Brown and Sharpe / AWG (American wire gauge):
This standard in addition to wire diameter is commonly used for precious metals, copper, and aluminum.

Birmingham:
Not Stubs' iron or BWG. Typically used for sheet goods.

Zinc:
For reasons unknown this gauge works backwards. The higher the gauge number the thicker the material.

Gauge Standard Steel
Inch (mm)		 Galvanized Steel
Inch (mm)		 Stainless Steel
Inch (mm)		 Brown & Sharpe's
Inch (mm)		 Zinc
Inch (mm)		 Birmingham
Inch (mm)
0000000 0.5000 (12.700mm) 0.6666 (16.932mm)
000000 0.4686 (11.902mm) 0.5800 (14.732mm) 0.6250 (15.875mm)
00000 0.4375 (11.113mm) 0.5165 (13.119mm) 0.5883 (14.943mm)
0000 0.4063 (10.320mm) 0.4600 (11.684mm) 0.5416 (13.757mm)
000 0.3750 (9.525mm) 0.4096 (10.404mm) 0.5000 (12.700mm)
00 0.3438 (8.733mm) 0.3648 (9.266mm) 0.4452 (11.308mm)
0 0.3125 (7.938mm) 0.3249 (8.252mm) 0.3964 (10.069mm)
1 0.2813 (7.145mm) 0.2893 (7.348mm) 0.0020 (0.051mm) 0.3532 (8.971mm)
2 0.2656 (6.746mm) 0.2576 (6.543mm) 0.0040 (0.102mm) 0.3147 (7.993mm)
3 0.2391 (6.073mm) 0.2500 (6.350mm) 0.2294 (5.827mm) 0.0060 (0.152mm) 0.2804 (7.122mm)
4 0.2242 (5.695mm) 0.2344 (5.954mm) 0.2043 (5.189mm) 0.0080 (0.203mm) 0.2500 (6.350mm)
5 0.2092 (5.314mm) 0.2187 (5.555mm) 0.1819 (4.620mm) 0.0100 (0.254mm) 0.2225 (5.652mm)
6 0.1943 (4.935mm) 0.2031 (5.159mm) 0.1620 (4.115mm) 0.0120 (0.305mm) 0.1981 (5.032mm)
7 0.1793 (4.554mm) 0.1875 (4.763mm) 0.1443 (3.665mm) 0.0140 (0.356mm) 0.1764 (4.481mm)
8 0.1644 (4.176mm) 0.1681 (4.270mm) 0.1719 (4.366mm) 0.1285 (3.264mm) 0.0160 (0.406mm) 0.1570 (3.988mm)
9 0.1495 (3.797mm) 0.1532 (3.891mm) 0.1562 (3.967mm) 0.1144 (2.906mm) 0.0180 (0.457mm) 0.1398 (3.551mm)
10 0.1345 (3.416mm) 0.1382 (3.510mm) 0.1406 (3.571mm) 0.1019 (2.588mm) 0.0200 (0.508mm) 0.1250 (3.175mm)
11 0.1196 (3.038mm) 0.1233 (3.132mm) 0.1250 (3.175mm) 0.0907 (2.304mm) 0.0240 (0.610mm) 0.1113 (2.827mm)
12 0.1046 (2.657mm) 0.1084 (2.753mm) 0.1094 (2.779mm) 0.0808 (2.052mm) 0.0280 (0.711mm) 0.0991 (2.517mm)
13 0.0897 (2.278mm) 0.0934 (2.372mm) 0.0937 (2.380mm) 0.0720 (1.829mm) 0.0320 (0.813mm) 0.0882 (2.240mm)
14 0.0747 (1.897mm) 0.0785 (1.994mm) 0.0781 (1.984mm) 0.0641 (1.628mm) 0.0360 (0.914mm) 0.0785 (1.994mm)
15 0.0673 (1.709mm) 0.0710 (1.803mm) 0.0703 (1.786mm) 0.0571 (1.450mm) 0.0400 (1.016mm) 0.0699 (1.775mm)
16 0.0598 (1.519mm) 0.0635 (1.613mm) 0.0625 (1.588mm) 0.0508 (1.290mm) 0.0450 (1.143mm) 0.0625 (1.588mm)
17 0.0538 (1.367mm) 0.0575 (1.461mm) 0.0562 (1.427mm) 0.0453 (1.151mm) 0.0500 (1.270mm) 0.0556 (1.412mm)
18 0.0478 (1.214mm) 0.0516 (1.311mm) 0.0500 (1.270mm) 0.0403 (1.024mm) 0.0550 (1.397mm) 0.0495 (1.257mm)
19 0.0418 (1.062mm) 0.0456 (1.158mm) 0.0437 (1.110mm) 0.0359 (0.912mm) 0.0600 (1.524mm) 0.0440 (1.118mm)
20 0.0359 (0.912mm) 0.0396 (1.006mm) 0.0375 (0.953mm) 0.0320 (0.813mm) 0.0700 (1.778mm) 0.0392 (0.996mm)
21 0.0329 (0.836mm) 0.0366 (0.930mm) 0.0344 (0.874mm) 0.0285 (0.724mm) 0.0800 (2.032mm) 0.0349 (0.886mm)
22 0.0299 (0.759mm) 0.0336 (0.853mm) 0.0312 (0.792mm) 0.0253 (0.643mm) 0.0900 (2.286mm) 0.0312 (0.792mm)
23 0.0269 (0.683mm) 0.0306 (0.777mm) 0.0281 (0.714mm) 0.0226 (0.574mm) 0.1000 (2.540mm) 0.0278 (0.706mm)
24 0.0239 (0.607mm) 0.0276 (0.701mm) 0.0250 (0.635mm) 0.0201 (0.511mm) 0.1250 (3.175mm) 0.0247 (0.627mm)
25 0.0209 (0.531mm) 0.0247 (0.627mm) 0.0219 (0.556mm) 0.0179 (0.455mm) 0.2500 (6.350mm) 0.0220 (0.559mm)
26 0.0179 (0.455mm) 0.0217 (0.551mm) 0.0187 (0.475mm) 0.0159 (0.404mm) 0.3750 (9.525mm) 0.0196 (0.498mm)
27 0.0164 (0.417mm) 0.0202 (0.513mm) 0.0172 (0.437mm) 0.0142 (0.361mm) 0.5000 (12.700mm) 0.0174 (0.442mm)
28 0.0149 (0.378mm) 0.0187 (0.475mm) 0.0156 (0.396mm) 0.0126 (0.320mm) 1.0000 (25.400mm) 0.0156 (0.396mm)
29 0.0135 (0.343mm) 0.0172 (0.437mm) 0.0141 (0.358mm) 0.0113 (0.287mm) 0.0139 (0.353mm)
30 0.0120 (0.305mm) 0.0157 (0.399mm) 0.0125 (0.318mm) 0.0100 (0.254mm) 0.0123 (0.312mm)
31 0.0105 (0.267mm) 0.0142 (0.361mm) 0.0109 (0.277mm) 0.0089 (0.226mm) 0.0110 (0.279mm)
32 0.0097 (0.246mm) 0.0134 (0.340mm) 0.0102 (0.259mm) 0.0080 (0.203mm) 0.0098 (0.249mm)
33 0.0090 (0.229mm) 0.0094 (0.239mm) 0.0071 (0.180mm) 0.0087 (0.221mm)
34 0.0082 (0.208mm) 0.0086 (0.218mm) 0.0063 (0.160mm) 0.0077 (0.196mm)
35 0.0075 (0.191mm) 0.0078 (0.198mm) 0.0056 (0.142mm) 0.0069 (0.175mm)
36 0.0067 (0.170mm) 0.0070 (0.178mm) 0.0050 (0.127mm) 0.0061 (0.155mm)
37 0.0064 (0.163mm) 0.0066 (0.168mm) 0.0045 (0.114mm) 0.0054 (0.137mm)
38 0.0060 (0.152mm) 0.0062 (0.157mm) 0.0040 (0.102mm) 0.0048 (0.122mm)
39 0.0035 (0.089mm) 0.0043 (0.109mm)
40 0.0031 (0.079mm) 0.0038 (0.097mm)
41 0.0034 (0.086mm)
42 0.0030 (0.076mm)
43 0.0027 (0.069mm)
44 0.0024 (0.061mm)
45 0.0021 (0.053mm)
46 0.0019 (0.048mm)
47 0.0017 (0.043mm)
48 0.0016 (0.041mm)
49 0.0013 (0.033mm)
50 0.0012 (0.030mm)
51 0.0011 (0.027mm)
52 0.0010 (0.024mm)
Gauge Standard Steel Galvanized Steel Stainless Steel Brown & Sharpe's Zinc Birmingham