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Sheet Metal Gauge Chart

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Whitepaper

The complete guide to Design for Manufacturing and Assembly

Last updated on April 30, 2026

What Does Gauge Mean in Metal?

In metalworking, gauge (or gage) is a standard unit of measure that indicates the thickness of a metal sheet. Unlike standard units, the gauge number is inversely proportional to the actual thickness; as the gauge number increases, the metal thickness decreases. This system is primarily used for ferrous metals and wire products to simplify manufacturing specifications.

Common Sheet Metal Gauge Standards

Manufacturers’ Standard Gage – for standard steel, galvanized steel, and stainless steel

The American Wire Gage (AWG) or Brown and Sharpe Gage – for non-ferrous metals, such as aluminum and brass.

Birmingham Gage (BG) – for a variety of metals

Standard Gauge for Zinc

The following charts shows the various gauge sizes of the common engineering materials, and their measurements in metric and imperial.

You might also want to see our Sheet Metal Gauge Calculator (mm to Gauge).

What is a Gauge Number?

A gauge number is a standardized measurement used to define the thickness of sheet metal or the diameter of wire. In this system, the numerical value is inversely related to the physical thickness; a higher gauge number indicates a thinner material, while a lower gauge number indicates a thicker material.

Sheet Metal Gauge Chart (Metric - mm)

Gauge #	Standard Steel	Galvanized Steel	Stainless Steel	Aluminum	Birmingham Gage	Zinc
0000000	-	-	12.700	-	16.932	-
000000	-	-	11.902	14.732	15.875	-
00000	-	-	11.113	13.119	14.943	-
0000	-	-	10.320	11.684	13.757	-
000	-	-	9.525	10.404	12.700	-
00	-	-	8.733	9.266	11.308	-
0	-	-	7.938	8.252	10.069	-
1	-	-	7.145	7.348	8.971	0.051
2	-	-	6.746	6.543	7.993	0.102
3	6.073	-	6.350	5.827	7.122	0.152
4	5.695	-	5.954	5.189	6.35	0.203
5	5.314	-	5.555	4.620	5.652	0.254
6	4.935	-	5.159	4.115	5.032	0.305
7	4.554	-	4.763	3.665	4.481	0.356
8	4.176	4.270	4.366	3.264	3.988	0.406
9	3.797	3.891	3.967	2.906	3.551	0.457
10	3.416	3.510	3.571	2.588	3.175	0.508
11	3.038	3.132	3.175	2.304	2.827	0.610
12	2.657	2.753	2.779	2.052	2.517	0.711
13	2.278	2.372	2.380	1.829	2.24	0.813
14	1.897	1.994	1.984	1.628	1.994	0.914
15	1.709	1.803	1.786	1.450	1.775	1.016
16	1.519	1.613	1.588	1.290	1.588	1.143
17	1.367	1.461	1.427	1.151	1.412	1.270
18	1.214	1.311	1.270	1.024	1.257	1.397
19	1.062	1.158	1.110	0.912	1.118	1.524
20	0.912	1.006	0.953	0.813	0.996	1.778
21	0.836	0.930	0.874	0.724	0.886	2.032
22	0.759	0.853	0.792	0.643	0.792	2.286
23	0.683	0.777	0.714	0.574	0.706	2.540
24	0.607	0.701	0.635	0.511	0.627	3.175
25	0.531	0.627	0.556	0.455	0.559	6.350
26	0.455	0.551	0.475	0.404	0.498	9.525
27	0.417	0.513	0.437	0.361	0.442	12.700
28	0.378	0.475	0.396	0.320	0.396	25.400
29	0.343	0.437	0.358	0.287	0.353	-
30	0.305	0.399	0.318	0.254	0.312	-
31	0.267	0.361	0.277	0.226	0.279	-
32	0.246	0.340	0.259	0.203	0.249	-
33	0.229	-	0.239	0.180	0.221	-
34	0.208	-	0.218	0.160	0.196	-
35	0.191	-	0.198	0.142	0.175	-
36	0.170	-	0.178	0.127	0.155	-
37	0.163	-	0.168	0.114	0.137	-
38	0.152	-	0.157	0.102	0.122	-
39	-	-	-	0.089	0.109	-
40	-	-	-	0.079	0.097	-
41	-	-	-	-	0.086	-
42	-	-	-	-	0.076	-
43	-	-	-	-	0.069	-
44	-	-	-	-	0.061	-
45	-	-	-	-	0.053	-
46	-	-	-	-	0.048	-
47	-	-	-	-	0.043	-
48	-	-	-	-	0.041	-
49	-	-	-	-	0.033	-
50	-	-	-	-	0.030	-
51	-	-	-	-	0.027	-
52	-	-	-	-	0.024	-

You might also want to see our Sheet Metal Gauge Calculator (inch to Gauge).

Sheet Metal Gauge Chart (Imperial - inch)

Gauge #	Standard Steel	Galvanized Steel	Stainless Steel	Aluminum	Birmingham Gage	Zinc
0000000	-	-	0.5000	-	0.6666	-
000000	-	-	0.4686	0.5800	0.6250	-
00000	-	-	0.4375	0.5165	0.5883	-
0000	-	-	0.4063	0.4600	0.5416	-
000	-	-	0.3750	0.4096	0.5000	-
00	-	-	0.3438	0.3648	0.4452	-
0	-	-	0.3125	0.3249	0.3964	-
1	-	-	0.2813	0.2893	0.3532	0.0020
2	-	-	0.2656	0.2576	0.3147	0.0040
3	0.2391	-	0.2500	0.2294	0.2804	0.0060
4	0.2242	-	0.2344	0.2043	0.2500	0.0080
5	0.2092	-	0.2187	0.1819	0.2225	0.0100
6	0.1943	-	0.2031	0.1620	0.1981	0.0120
7	0.1793	-	0.1875	0.1443	0.1764	0.0140
8	0.1644	0.1681	0.1719	0.1285	0.1570	0.0160
9	0.1495	0.1532	0.1562	0.1144	0.1398	0.0180
10	0.1345	0.1382	0.1406	0.1019	0.1250	0.0200
11	0.1196	0.1233	0.1250	0.0907	0.1113	0.0240
12	0.1046	0.1084	0.1094	0.0808	0.0991	0.0280
13	0.0897	0.0934	0.0937	0.0720	0.0882	0.0320
14	0.0747	0.0785	0.0781	0.0641	0.0785	0.0360
15	0.0673	0.0710	0.0703	0.0571	0.0699	0.0400
16	0.0598	0.0635	0.0625	0.0508	0.0625	0.0450
17	0.0538	0.0575	0.0562	0.0453	0.0556	0.0500
18	0.0478	0.0516	0.0500	0.0403	0.0495	0.0550
19	0.0418	0.0456	0.0437	0.0359	0.0440	0.0600
20	0.0359	0.0396	0.0375	0.0320	0.0392	0.0700
21	0.0329	0.0366	0.0344	0.0285	0.0349	0.0800
22	0.0299	0.0336	0.0312	0.0253	0.0312	0.0900
23	0.0269	0.0306	0.0281	0.0226	0.0278	0.1000
24	0.0239	0.0276	0.0250	0.0201	0.0247	0.1250
25	0.0209	0.0247	0.0219	0.0179	0.0220	0.2500
26	0.0179	0.0217	0.0187	0.0159	0.0196	0.3750
27	0.0164	0.0202	0.0172	0.0142	0.0174	0.5000
28	0.0149	0.0187	0.0156	0.0126	0.0156	1.0000
29	0.0135	0.0172	0.0141	0.0113	0.0139	-
30	0.0120	0.0157	0.0125	0.0100	0.0123	-
31	0.0105	0.0142	0.0109	0.0089	0.0110	-
32	0.0097	0.0134	0.0102	0.0080	0.0098	-
33	0.0090	-	0.0094	0.0071	0.0087	-
34	0.0082	-	0.0086	0.0063	0.0077	-
35	0.0075	-	0.0078	0.0056	0.0069	-
36	0.0067	-	0.0070	0.0050	0.0061	-
37	0.0064	-	0.0066	0.0045	0.0054	-
38	0.0060	-	0.0062	0.0040	0.0048	-
39	-	-	-	0.0035	0.0043	-
40	-	-	-	0.0031	0.0038	-
41	-	-	-	-	0.0034	-
42	-	-	-	-	0.0030	-
43	-	-	-	-	0.0027	-
44	-	-	-	-	0.0024	-
45	-	-	-	-	0.0021	-
46	-	-	-	-	0.0019	-
47	-	-	-	-	0.0017	-
48	-	-	-	-	0.0016	-
49	-	-	-	-	0.0013	-
50	-	-	-	-	0.0012	-
51	-	-	-	-	0.0011	-
52	-	-	-	-	0.0010	-

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Adar Hay

Co-Founder and CEO of Jiga. Adar is a tech industry revenue leader with vast experience in product and marketing management. He's driving Jiga's mission to help build better products through transparent and efficient collaboration.

Adar Hay

Co-Founder and CEO of Jiga. Adar is a tech industry revenue leader with vast experience in product and marketing management. He's driving Jiga's mission to help build better products through transparent and efficient collaboration.

Whitepaper

The complete guide to Design for Manufacturing and Assembly

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