Sheet Metal Gauge Chart

Sheet Metal Gauge Chart
Jack Lie CNC machining expert

Specialize in CNC milling , CNC turning, 3D printing, urethane casting, rapid tooling, injection molding, metal casting,


Sheet metal gauge charts typically lists the gauge size and the corresponding thickness of the sheet metal in inches or millimeters. They are often used by fabricators, manufacturers, and engineers when specifying the size of sheet metal for a project. The chart is useful for determining the thickness of sheet metal for a particular application, and it can also be used to compare the thickness of different gauge sizes of sheet metal.

What Is the Sheet Metal Gauge?

A sheet metal gauge is a standard unit of measurement for the thickness of sheet metal. The smaller the gauge number, the thicker the sheet metal. For example, sheet metal with a gauge of 8 is thicker than one with a gauge of 10. Note that a standard exists for zinc in which its thickness is proportional to the size of the gauge number. Sheet metal is often specified by its gauge size, with thicker sheet metal being used for applications that require more strength or durability.

Sheet metal gauge is commonly used in the construction and manufacturing industries to specify the thickness of sheet metal for a particular application. Sheet metal is used in a wide range of applications, including the construction of buildings, the manufacturing of automotive and aerospace parts, and the production of appliances and other consumer goods. The gauge of the sheet metal is often specified to ensure that the sheet metal is strong enough for the intended use.

There are several different gauge systems used to specify the thickness of sheet metal, including the American Wire Gauge (AWG) system(also known as the Brown and Sharpe Gage), the Birmingham Gage (BG), and the Standard Wire Gauge (SWG) system used in the United States for sheet metal. It is important to use the correct gauge system when specifying the thickness of sheet metal, as different systems may have different gauge sizes and corresponding thicknesses.

The chart below is available for determining the equivalent sheet thickness in inches or millimeters for brass, copper, standard steel, galvanized steel, stainless steel, aluminum, and zinc with the selected gauge size standard. The weight per unit area of the sheet can also be seen in pounds per square foot and kilograms per square meter. These charts can also be used for material selection or confirming the metal thickness for the CNC machining process.

Brass Gauge Chart

Gauge Thickness
inch mm
7 0.1443 3.665
8 0.1285 3.264
9 0.1144 2.906
10 0.1019 2.588
11 0.09074 2.305
12 0.08081 2.053
14 0.06408 1.628
16 0.05082 1.291
18 0.04030 1.024
20 0.03196 0.812
22 0.02535 0.644
24 0.02010 0.511
26 0.01594 0.405
28 0.01264 0.321
30 0.01003 0.255

Copper Gauge Chart

Gauge Thickness
inch mm
7 0.180 4.572
8 0.165 4.191
9 0.148 3.759
10 0.134 3.404
11 0.120 3.048
12 0.109 2.769
14 0.083 2.108
16 0.065 1.651
18 0.049 1.245
20 0.035 0.889
22 0.028. 0.711
24 0.022 0.559
26 0.018 0.457
28 0.014 0.356
30 0.012 0.305

Birmingham Gage Chart

Gauge Thickness
in mm
0000000 0.6666 16.932
000000 0.6250 15.875
00000 0.5883 14.943
0000 0.5416 13.757
000 0.5000 12.700
00 0.4452 11.308
0 0.3964 10.069
1 0.3532 8.971
2 0.3147 7.993
3 0.2804 7.122
4 0.2500 6.350
5 0.2225 5.652
6 0.1981 5.032
7 0.1764 4.481
8 0.1570 3.988
9 0.1398 3.551
10 0.1250 3.175
11 0.1113 2.827
12 0.0991 2.517
13 0.0882 2.240
14 0.0785 1.994
15 0.0699 1.775
16 0.0625 1. 588
17 0.0556 1.412
18 0.0495 1.257
19 0.0440 1.118
20 0.0392 0.996
21 0.0349 0.886
22 0.0312 0.792
23 0.0278 0.706
24 0.0247 0.627
25 0.0220 0.559
26 0.0196 0.498
27 0.0174 0.442
28 0.0156 0.396
29 0.0139 0.353
30 0.0123 0.312
31 0.0110 0.279
32 0.0098 0.249
33 0.0087 0.221
34 0.0077 0.196
35 0.0069 0.175
36 0.0061 0.155
37 0.0054 0.137
38 0.0048 0.122
39 0.0043 0.109
40 0.0038 0.097
41 0.0034 0.086
42 0.0030 0.076
43 0.0027 0.069
44 0.0024 0.061
45 0.0021 0.053
46 0.0019 0.048
47 0.0017 0.043
48 0.0016 0.041
49 0.0013 0.033
50 0.0012 0.030
51 0.0011 0.027
52 0.0010 0.024

Standard Steel Gauge Chart

Gauge Thickness Weight Per Area
in mm lb/ft² kg/m²
3 0.2391 6.073 9.754 47.624
4 0.2242 5.695 9.146 44.656
5 0.2092 5.314 8.534 41.668
6 0.1943 4.935 7.927 38.701
7 0.1793 4.554 7.315 35.713
8 0.1644 4.176 6.707 32.745
9 0.1495 3.797 6.099 29.777
10 0.1345 3.416 5.487 26.790
11 0.1196 3.038 4.879 23.822
12 0.1046 2.657 4.267 20.834
13 0.0897 2.278 3.659 17.866
14 0.0747 1.897 3.047 14.879
15 0.0673 1.709 2.746 13.405
16 0.0598 1.519 2.440 11.911
17 0.0538 1.367 2.195 10.716
18 0.0478 1.214 1.950 9.521
19 0.0418 1.062 1.705 8.326
20 0.0359 0.912 1.465 7.151
21 0.0329 0.836 1.342 6.553
22 0.0299 0.759 1.220 5.955
23 0.0269 0.683 1.097 5.358
24 0.0239 0.607 0.975 4.760
25 0.0209 0.531 0.853 4.163
26 0.0179 0.455 0.730 3.565
27 0.0164 0.417 0.669 3.267
28 0.0149 0.378 0.608 2.968
29 0.0135 0.343 0.551 2.689
30 0.0120 0.305 0.490 2.390
31 0.0105 0.267 0.428 2.091
32 0.0097 0.246 0.396 1.932
33 0.0090 0.229 0.367 1.793
34 0.0082 0.208 0.335 1.633
35 0.0075 0.191 0.306 1.494
36 0.0067 0.170 0.273 1.335
37 0.0064 0.163 0.261 1.275
38 0.0060 0.152 0.245 1.195

Galvanized Steel Gauge Chart

Gauge Thickness Weight Per Area
in mm lb/ft² kg/m²
8 0.1681 4.270 6.858 33.482
9 0.1532 3.891 6.250 30.514
10 0.1382 3.510 5.638 27.527
I1 0.1233 3.132 5.030 24.559
12 0.1084 2.753 4.422 21.591
13 0.0934 2.372 3.810 18.603
14 0.0785 1.994 3.202 15.636
15 0.0710 1.803 2.896. 14.142
16 0.0635 1.613 2.590 12.648
17 0.0575 1.461 2.346 11.453
18 0.0516 1.311 2.105 10.278
19 0.0456 1.158. 1.860 9.083
20 0.0396 1.006. 1.615 7.888
21 0.0366 0.930 1.493 7.290
22 0.0336 0.853 1.371 6.692
23 0.0306 0.777 1.248 6.095
24 0.0276 0.701 1.126 5.497
25 0.0247 0.627 1.008 4.920
26 0.0217 0.551 0.885 4.322
27 0.0202 0.513 0.824 4.023
28 0.0187 0.475 0.763 3.725
29 0.0172 0.437 0.702 3. .426
30 0.0157 0.399 0.640 3.127
31 0.0142 0.361 0.579 2.828
32 0.0134 0.340 0.547 2.669

Stainless Steel Gauge Chart

Gauge Thickness Weight Per Area
in mm lb/ft² kg/m²
0000000 0.5000 12.700 20.808 101.594
000000 0.4686 11.902 19.501 95.213
00000 0.4375 11.113 18.207 88.894
0000 0.4063 10.320 1 6.909 82.555
000 0.3750 9.525 15.606 76.195
00 0.3438 8.733 14.308 69.856
0 0.3125 7.938 13.005 63.496
1 0.2813 7.145 11.707 57.157
2 0.2656 6.746 11.053 53.966
3 0.2500 6.350 10.404 50.797
4 0.2344 5.954 9.755 47.627
5 0.2187 5.555 9.101 44.437
6 0.2031 5.159 8.452 41.267
7 0.1875 4.763 7.803 38.098
8 0.1719 4.366 7.154 34.928
9 0.1562 3.967 6.500 31.738
10 0.1406 3.571 5.851 28.568
11 0.1250 3.175 5.202 25.398
12 0.1094 2.779 4.553 22.229
13 0.0937 2.380 3. .899 19.039
14 0.0781 1.984 3.250 15.869
15 0.0703 1.786 2.926 14.284
16 0.0625 1.588 2.601 12.699
17 0.0562 1.427 2.339 11.419
18 0.0500 1.270 2.081 10.159
19 0.0437 1.110 1.819 8.879
20 0.0375 0.953 1.561 7.620
21 0.0344 0.874 1.432 6.990
22 0.0312 0.792 1.298 6.339
23 0.0281 0.714 1.169 5.710
24 0.0250 0.635 1.040 5.080
25 0.0219 0.556 0.911 4.450
26 0.0187 0.475 0.778 3.800
27 0.0172 0.437 0.716 3.495
28 0.0156 0.396 0.649 3.170
29 0.0141 0.358 0.587 2.865
30 0.0125 0.318 0.520 2.540
31 0.0109 0.277 0.454 2.215
32 0.0102 0.259 0.424 2.073
33 0.0094 0.239 0.391 1.910
34 0.0086 0.218 0.358 1.747
35 0.0078 0.198 0.325 1.585
36 0.0070 0.178 0.291 1. 422
37 0.0066 0.168 0.275 1.341
38 0.0062 0.157 0.258 1.260

Aluminum Gauge Chart

Gauge Thickness Weight Per Area
in mm lb/ft² kg/m²
000000 0.5800 14.732 8.185 39.962
00000 0.5165 13.119 7.289 35.587
0000 0.4600 11.684 6.492 31.694
000 0.4096 10.404 5.780 28.222
00 0.3648 9.266 5.148 25.135
0 0.3249 8.252 4.585 22.386
1 0.2893 7.348 4.083 19.933
2 0.2576 6.543 3.635 17.749
3 0.2294 5.827 3.237 15.806
4 0.2043 5.189 2.883 14.076
5 0.1819 4.620 2.567 12.533
6 0.1620 4.115 2.286 11.162
7 0.1443 3.665 2.036 9.942
8 0.1285 3.264 1.813 8.854
9 0.1144 2.906 1.614 7.882
10 0.1019 2.588 1.438 7.021
11 0.0907 2.304 1.280 6.249
12 0.0808 2.052 1.140 5.567
13 0.0720 1.829 1.016 4.961
14 0.0641 1.628 0.905 4.417
15 0.0571 1.450 0.806 3.934
16 0.0508 1.290 0.717 3.500
17 0.0453 1.151 0.639 3.121
18 0.0403 1.024 0.569 2.777
19 0.0359 0.912 0.507 2.474
20 0.0320 0.813 0.452 2.205
21 0.0285 0.724 0.402 1.964
22 0.0253 0.643 0.357 1.743
23 0.0226 0.574 0.319 1.557
24 0.0201 0.511 0.284 1.385
25 0.0179 0.455 0.253 1.233
26 0.0159 0.404 0.224 1.096
27 0.0142 0.361 0.200 0.978
28 0.0126 0.320 0.178 0.868
29 0.0113 0.287 0.159 0.779
30 0.0100 0.254 0.141 0.689
31 0.0089 0.226 0.126 0.613
32 0.0080 0.203 0.113 0.551
33 0.0071 0.180 0.100 0.489
34 0.0063 0.160 0.089 0.434
35 0.0056 0.142 0.079 0.386
36 0.0050 0.127 0.071 0.345
37 0.0045 0.114 0.064 0.310
38 0.0040 0.102 0.056 0.276
39 0.0035 0.089 0.049 0.241
40 0.0031 0.079 0.044 0.214

Zinc Gauge Chart

Gauge Thickness Weight Per Area
in mm lb/ft² kg/m²
28 1.0000 25.400 37.152 181.392
27 0.5000 12.700 18.576 90.696
26 0.3750 9.525 13.932 68.022
25 0.2500 6.350 9.288 45.348
24 0.1250 3.175 4.644 22.674
23 0.1000 2.540 3.715 18.139
22 0.0900 2.286 3.344 16.325
21 0.0800 2.032 2.972 14.511
20 0.0700 1.778 2.601 12.697
19 0.0600 1.524 2.229 10.884
18 0.0550 1.397 2.043 9.977
17 0.0500 1.270 .1.858 9.070
16 0.0450 1.143 1.672. 8.163
15 0.0400 1.016 1.486 7.256
14 0.0360 0.914 1.337 6.530
13 0.0320 0.813 1.189 5.805
12 0.0280 0.711 1.040 5.079
11 0.0240 0.610 0.892 4.353
10 0.0200 0.508 0.743 3.628
9 0.0180 0.457 0.669 3.265
8 0.0160 0.406 0.594 2.902
7 0.0140 0.356 0.520 2.539
6 0.0120 0.305 0.446 2.177
5 0.0100 0.254 0.372 1.814
4 0.0080 0.203 0.297 1.451
3 0.0060 0.152 0.223 1.088
2 0.0040 0.102 0.149 0.726
1 0.0020 0.051 0.074 0.363