Sheet Metal Gauge Thickness Chart

When using sheet metal to build your products, there is a term you may come across. That is gauge. Gauge is used to specify the thickness of the sheet metal. The more the gauge number, the lower the thickness value. For example, 15 gauge of standard steel measures 1.709 mm, whereas 20 gauge standard steel measures 0.912 mm. The same rule is valid for all materials. Closely related to this term is the sheet metal gauge thickness chart. With this chart, you can achieve a quick conversion from gauge to mm/inch for sheet metal.

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Sheet Metal Gauge to mm
Gauge Number	Standard Steel (mm)	Galvanized Steel (mm)	Stainless Steel (mm)	Aluminum, Brass, Copper (mm)
3	6.073	–	–	5.827
4	5.095	–	5.954	5.189
5	5.314	–	5.555	4.62
6	4.935	–	5.159	4.115
7	4.554	–	4.763	3.665
8	4.176	–	4.191	3.264
9	3.797	3.891	3.967	2.906
10	3.416	3.51	3.571	2.588
11	3.038	3.132	3.175	2.304
12	2.657	2.753	2.779	2.052
13	2.278	2.372	2.38	1.829
14	1.897	1.994	1.984	1.628
15	1.709	1.803	1.786	1.45
16	1.519	1.613	1.588	1.29
17	1.367	1.461	1.427	1.151
18	1.214	1.311	1.27	1.024
19	1.062	1.158	1.11	0.912
20	0.912	1.006	0.953	0.813
21	0.836	0.93	0.874	0.724
22	0.759	0.853	0.792	0.643
23	0.683	0.777	0.714	0.574
24	0.607	0.701	0.635	0.536
25	0.531	0.627	0.556	0.455
26	0.455	0.551	0.475	0.404
27	0.417	0.513	0.437	0.361
28	0.378	0.475	0.396	0.32
29	0.343	0.437	0.358	0.287
30	0.305	0.399	0.318	0.254
31	0.267	0.361	0.277	0.226
32	0.246	0.34	0.259	0.203
33	0.229	–	0.239	0.18
34	0.208	–	0.218	0.16
35	0.191	–	0.198	0.142
36	0.17	–	0.178	0.127
37	0.163	–	0.168	0.113
38	0.17	–	0.157	0.101

Sheet Metal Gauge to Inch
Gauge Number	Standard Steel (in)	Galvanized Steel (in)	Stainless Steel (in)	Aluminum, Brass, Copper (in)
3	0.2391	–	–	0.2294
4	0.2242	–	0.2344	0.2043
5	0.2092	–	0.2187	0.1819
6	0.1943	–	0.2031	0.162
7	0.1793	–	0.1875	0.1443
8	0.1644	–	0.165	0.1285
9	0.1495	0.1532	0.1562	0.1144
10	0.1345	0.1382	0.1406	0.1019
11	0.1196	0.1233	0.125	0.0907
12	0.1046	0.1084	0.1094	0.0808
13	0.0897	0.0934	0.0937	0.072
14	0.0747	0.0785	0.0781	0.0641
15	0.0673	0.071	0.0703	0.0571
16	0.0598	0.0635	0.0625	0.0508
17	0.0538	0.0575	0.0562	0.0453
18	0.0478	0.0516	0.05	0.0403
19	0.0418	0.0456	0.0437	0.0359
20	0.0359	0.0396	0.0375	0.032
21	0.0329	0.0366	0.0344	0.0285
22	0.0299	0.0336	0.0312	0.0253
23	0.0269	0.0306	0.0281	0.0226
24	0.0239	0.0276	0.025	0.0211
25	0.0209	0.0247	0.0219	0.0179
26	0.0179	0.0217	0.0187	0.0159
27	0.0164	0.0202	0.0172	0.0142
28	0.0149	0.0187	0.0156	0.0126
29	0.0135	0.0172	0.0141	0.0113
30	0.012	0.0157	0.0125	0.01
31	0.0105	0.0142	0.0109	0.0089
32	0.0097	0.0134	0.0102	0.008
33	0.009	–	0.0094	0.0071
34	0.0082	–	0.0086	0.0063
35	0.0075	–	0.0078	0.0056
36	0.0067	–	0.007	0.005
37	0.0064	–	0.0066	0.00445
38	0.0067	–	0.0062	0.00396

Alfa Chemistry provides a sheet metal gauge thickness chart for your use. If you need help during the conversion process, please feel free to contact us. Whether you are a researcher, a scientist, or a student, we are your most trusted partner.