Gauge (or gage) sizes are numbers that indicate the thickness of a piece of sheet metal, with a higher number referring to a thinner sheet. The equivalent thicknesses differ for each gauge size standard, which were developed based on the weight of the sheet for a given material. The Manufacturers' Standard Gage provides the thicknesses for standard steel, galvanized steel, and stainless steel. The Brown and Sharpe Gage, also known as the American Wire Gage (AWG), is used for most non ferrous metals, such as Aluminum and Brass. In the UK, the Birmingham Gage (BG) is used for a variety of metals and should not be confused with the Birmingham Wire Gage (BWG), which is used for wires. Lastly, a standard exists for Zinc in which a higher gauge number indicates a thicker sheet. The chart below can be used to determine the equivalent sheet thickness, in inches or millimeters, for a gauge number from 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.
Gauge size standard: Standard steel Galvanized steel Stainless steel Aluminum Zinc Birmingham Gage
Thickness
Weight Per Area
Gauge
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
Thickness
Weight Per Area
Gauge
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
11
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
Thickness
Weight Per Area
Gauge
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
16.909
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
Thickness
Weight Per Area
Gauge
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
Thickness
Weight Per Area
Gauge
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
Thickness
Gauge
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
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