Sheet Metal Gauge Chart

 

NOTE: These are theoretical gauge thickness. Actual thickness will vary depending on the mill it was rolled at, batch number, etc.

Also, note that nonferrous gauges (aluminum) are not the same as ferrous gauges (steel & stainless).

Gauge
STEEL
 
ALUMINUM
(inches)
(mm)
 
(inches)
(mm)
3
.2391
6.073
 
.2294
5.827
4
.2242
5.695
 
.2043
5.189
5
.2092
5.314
 
.1819
4.620
6
.1943
4.935
 
.1620
4.115
7
.1793
4.554
 
.1443
3.665
8
.1644
4.176
 
.1285
3.264
9
.1495
3.797
 
.1144
2.906
10
.1345
3.416
 
.1019
2.588
11
.1196
3.030
 
.0907
2.304
12
.1046
2.657
 
.0808
2.052
13
.0897
2.278
 
.0720
1.829
14
.0747
1.897
 
.0641
1.628
15
.0673
1.709
 
.0571
1.450
16
.0598
1.519
 
.0508
1.290
17
.0538
1.367
 
.0453
1.151
18
.0478
1.214
 
.0403
1.024
19
.0418
1.062
 
.0359
0.912
20
.0359
0.912
 
.0320
0.813
21
.0329
0.836
 
.0285
0.724
22
.0299
0.759
 
.0253
0.643
23
.0269
0.683
 
.0226
0.574
24
.0239
0.607
 
.0201
0.511
25
.0209
0.531
 
.0179
0.455
26
.0179
0.455
 
.0159
0.404
27
.0164
0.417
 
.0142
0.361
28
.0149
0.378
 
.0126
0.320
29
.0135
0.343
 
.0113
0.287
30
.0120
0.305
 
.0100
0.254
31
.0105
0.267
 
.0089
0.226
32
.0097
0.246
 
.0080
0.203
33
.0090
0.229
 
.0071
0.180
34
.0082
0.208
 
.0063
0.160
35
.0075
0.191
 
.0056
0.142
 
 
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