The Ultimate Sheet Metal Gauge Thickness Chart Guide

February 23, 2024

Sheet Metal Gauge Thickness Chart

When you deal in sheet metal, you will have heard the term “Guage” commonly used. For example, those who are not familiar with the Guage system may not understand what 20Guage means. To help more people better understand Guage and attach a sheet metal gauge table.

How to use sheet metal gauge?

Guage is used to specify the thickness of metal sheets, metal wires, and other thin materials. Gauges are neither standard nor metric, and their values are not related to these measurement systems. However, it is important to note that the gauge number is inversely proportional to thickness: the higher the gauge number, the thinner the material, while the lower the gauge number, the thicker the material.

There are several different gauge systems in use today, and specific gauge names are used for specific metal types. For example, in one gauge system, 18 Guage Steel is 0.0478 inches thick, while 18 gauge aluminum is 0.0403 inches thick. Due to the different thicknesses, a gauge table should be used to ensure that the metal meets the required size.

What is Gauge?

Gauges are used to specify the thickness of the sheet metal. Gauge is neither standard nor metric, and its values are independent of those measurement systems. Generally speaking, for the same material, the higher the number, the thinner the sheet of metal.

Gauge is different from inches in that there is no conversion formula. Even if the non-ferrous metal plate and steel plate are the same Ga., the thickness is actually different.

History of the Gauge System

The gauge system has a long history in metal manufacturing. It most likely originated in the British wire industry before the standard and metric measurement systems were widely adopted. At the time, gauge was used to describe the diameter of metal wire being drawn. Since then, it has remained a popular method for specifying the thickness of wire and sheet metal.

Sheet Metal Gauge Thickness Conversion Chart

Below is a table of sheet metal specifications shown in millimeters per inch, including Mild Steel, Galvanized, Galvalume / Aluzinc, Aluminum, Stainless, Copper, Brass, AWG, BWG

Sheet Metal Gauge Chart List

To determine what metal gauge you need, use these sheet metal gauge charts:

Mild Steel Gauge Chart
	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	26.79
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	2.44	11.911
17	0.0538	1.367	2.195	10.716
18	0.0478	1.214	1.95	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	1.22	5.955
23	0.0269	0.683	1.097	5.358
24	0.0239	0.607	0.975	4.76
25	0.0209	0.531	0.853	4.163
26	0.0179	0.455	0.73	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	0.012	0.305	0.49	2.39
31	0.0105	0.267	0.428	2.091
32	0.0097	0.246	0.396	1.932
33	0.009	0.229	0.367	1.793

Buy Mild Steel

Galvanized Steel Gauge Chart
	Thickness		Weight Per Area
Gauge	in	mm	lb/ft²	kg/m²
8	0.1681	4.27	6.858	33.482
9	0.1532	3.891	6.25	30.514
10	0.1382	3.51	5.638	27.527
11	0.1233	3.132	5.03	24.559
12	0.1084	2.753	4.422	21.591
13	0.0934	2.372	3.81	18.603
14	0.0785	1.994	3.202	15.636
15	0.071	1.803	2.896	14.142
16	0.0635	1.613	2.59	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	1.86	9.083
20	0.0396	1.006	1.615	7.888
21	0.0366	0.93	1.493	7.29
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	4.92
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	0.64	3.127
31	0.0142	0.361	0.579	2.828
32	0.0134	0.34	0.547	2.669

Buy Galvanized Steel

Galvalume Aluzinc Steel Gauge Chart
	Thickness
Gauge	in	mm
8	0.1691	4.2956
9	0.1541	3.9143
10	0.1390	3.5311
11	0.1240	3.1508
12	0.1091	2.7695
13	0.0940	2.3862
14	0.0790	2.0060
15	0.0714	1.8138
16	0.0639	1.6227
17	0.0578	1.4698
18	0.0519	1.3189
19	0.0459	1.1649
20	0.0398	1.0120
21	0.0368	0.9356
22	0.0338	0.8581
23	0.0308	0.7817
24	0.0278	0.7052
25	0.0248	0.6308
26	0.0218	0.5543
27	0.0203	0.5161
28	0.0188	0.4779
29	0.0173	0.4396
30	0.0158	0.4014
31	0.0143	0.3632
32	0.0135	0.3420

Buy Galvalume Aluzinc Steel

Stainless Steel Gauge Chart
	Thickness		Weight Per Area
Gauge	in	mm	lb/ft²	kg/m²
7/0	0.5	12.7	20.808	101.594
6/0	0.4686	11.902	19.501	95.213
5/0	0.4375	11.113	18.207	88.894
4/0	0.4063	10.32	16.909	82.555
3/0	0.375	9.525	15.606	76.195
2/0	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	0.25	6.35	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	6.5	31.738
10	0.1406	3.571	5.851	28.568
11	0.125	3.175	5.202	25.398
12	0.1094	2.779	4.553	22.229
13	0.0937	2.38	3.899	19.039
14	0.0781	1.984	3.25	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	0.05	1.27	2.081	10.159
19	0.0437	1.11	1.819	8.879
20	0.0375	0.953	1.561	7.62
21	0.0344	0.874	1.432	6.99
22	0.0312	0.792	1.298	6.339
23	0.0281	0.714	1.169	5.71
24	0.025	0.635	1.04	5.08
25	0.0219	0.556	0.911	4.45
26	0.0187	0.475	0.778	3.8
27	0.0172	0.437	0.716	3.495
28	0.0156	0.396	0.649	3.17
29	0.0141	0.358	0.587	2.865
30	0.0125	0.318	0.52	2.54
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	1.91
34	0.0086	0.218	0.358	1.747
35	0.0078	0.198	0.325	1.585
36	0.007	0.178	0.291	1.422
37	0.0066	0.168	0.275	1.341
38	0.0062	0.157	0.258	1.26

Buy Stainless Steel

Aluminum Gauge Chart
	Thickness		Weight Per Area
Gauge	in	mm	lb/ft²	kg/m²
6/0	0.58	14.732	8.185	39.962
5/0	0.5165	13.119	7.289	35.587
4/0	0.46	11.684	6.492	31.694
3/0	0.4096	10.404	5.78	28.222
2/0	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	4.62	2.567	12.533
6	0.162	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	1.28	6.249
12	0.0808	2.052	1.14	5.567
13	0.072	1.829	1.016	4.961
14	0.0641	1.628	0.905	4.417
15	0.0571	1.45	0.806	3.934
16	0.0508	1.29	0.717	3.5
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	0.032	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	0.2	0.978
28	0.0126	0.32	0.178	0.868
29	0.0113	0.287	0.159	0.779
30	0.01	0.254	0.141	0.689
31	0.0089	0.226	0.126	0.613
32	0.008	0.203	0.113	0.551
33	0.0071	0.18	0.1	0.489
34	0.0063	0.16	0.089	0.434
35	0.0056	0.142	0.079	0.386
36	0.005	0.127	0.071	0.345
37	0.0045	0.114	0.064	0.31
38	0.004	0.102	0.056	0.276
39	0.0035	0.089	0.049	0.241
40	0.0031	0.079	0.044	0.214

Buy Aluminum

Zinc Gauge Chart
	Thickness		Weight Per Area
Gauge	in	mm	lb/ft²	kg/m²
28	1	25.4	37.152	181.392
27	0.5	12.7	18.576	90.696
26	0.375	9.525	13.932	68.022
25	0.25	6.35	9.288	45.348
24	0.125	3.175	4.644	22.674
23	0.1	2.54	3.715	18.139
22	0.09	2.286	3.344	16.325
21	0.08	2.032	2.972	14.511
20	0.07	1.778	2.601	12.697
19	0.06	1.524	2.229	10.884
18	0.055	1.397	2.043	9.977
17	0.05	1.27	1.858	9.07
16	0.045	1.143	1.672	8.163
15	0.04	1.016	1.486	7.256
14	0.036	0.914	1.337	6.53
13	0.032	0.813	1.189	5.805
12	0.028	0.711	1.04	5.079
11	0.024	0.61	0.892	4.353
10	0.02	0.508	0.743	3.628
9	0.018	0.457	0.669	3.265
8	0.016	0.406	0.594	2.902
7	0.014	0.356	0.52	2.539
6	0.012	0.305	0.446	2.177
5	0.01	0.254	0.372	1.814
4	0.008	0.203	0.297	1.451
3	0.006	0.152	0.223	1.088
2	0.004	0.102	0.149	0.726
1	0.002	0.051	0.074	0.363

Buy Zinc

Brass Gauge Chart
	Thickness
Gauge	in	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	0.0403	1.024
20	0.03196	0.812
22	0.02535	0.644
24	0.0201	0.511
26	0.01594	0.405
28	0.01264	0.321
30	0.01003	0.255

Buy Brass

Copper Gauge Chart
	Thickness
Gauge	in	mm
7	0.18	4.572
8	0.165	4.191
9	0.148	3.759
10	0.134	3.404
11	0.12	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

Buy Copper

Tinplate Weight Conversion Chart
	Thickness
Base Weight (LBS)	in	mm	U.S. Guage
50	0.0055	0.14
54	0.0059	0.151	38
55	0.0061	0.154
57	0.0063	0.159
59	0.0065	0.165	37
61	0.0067	0.17	36
63	0.0069	0.176
65	0.0072	0.182
66	0.0073	0.184
68	0.0075	0.19	35
70	0.0077	0.196
72	0.0079	0.201
74	0.0081	0.207
75	0.0081	0.207	34
77	0.0085	0.215
79	0.0087	0.221
81	0.0089	0.226
83	0.0091	0.232	33
85	0.0094	0.237
86	0.0095	0.24
87	0.0096	0.243	32
89	0.0098	0.249
91	0.01	0.254
93	0.0102	0.26
95	0.0105	0.265	31
96	0.0106	0.268
98	0.0108	0.274
100	0.011	0.279
102	0.0112	0.285
104	0.0114	0.291
105	0.0116	0.293
107	0.0118	0.299
109	0.012	0.305	30
111	0.0122	0.31
113	0.0124	0.316
115	0.0127	0.312
116	0.0128	0.324
118	0.013	0.33
120	0.0132	0.335
122	0.0134	0.341
124	0.0136	0.346	29
125	0.0138	0.349
127	0.014	0.355
129	0.0142	0.36
131	0.0144	0.366
133	0.0146	0.372
135	0.0149	0.377	28
136	0.015	0.38
139	0.0153	0.388
141	0.0155	0.394
145	0.016	0.405
148	0.0163	0.414	27

Buy Tinplate

Birmingham Gage Chart
	Thickness
Gauge	in	mm
7/0	0.6666	16.932
6/0	0.625	15.875
5/0	0.5883	14.943
4/0	0.5416	13.757
3/0	0.5	12.7
2/0	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	0.25	6.35
5	0.2225	5.652
6	0.1981	5.032
7	0.1764	4.481
8	0.157	3.988
9	0.1398	3.551
10	0.125	3.175
11	0.1113	2.827
12	0.0991	2.517
13	0.0882	2.24
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	0.044	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	0.022	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	0.011	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	0.003	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	0.03
51	0.0011	0.027
52	0.001	0.024

WIRE AND SHEET METAL GAUGE EQUIVALENTS
Gauge	Thickness (Inch)
	Imperial	American	Birmingham
	SWG	AWG	BWG
7/0	0.5	–	–
6/0	0.464	0.58	–
5/0	0.432	0.5165	–
4/0	0.4	0.46	0.454
3/0	0.372	0.4096	0.425
2/0	0.348	0.3648	0.38
0	0.324	0.3249	0.34
1	0.3	0.2893	0.3
2	0.276	0.2576	0.284
3	0.252	0.2294	0.259
4	0.232	0.2043	0.238
5	0.212	0.1819	0.22
6	0.192	0.162	0.203
7	0.176	0.1443	0.18
8	0.16	0.1285	0.165
9	0.144	0.1144	0.148
10	0.128	0.1019	0.134
11	0.116	0.0907	0.12
12	0.104	0.0808	0.109
13	0.092	0.072	0.095
14	0.08	0.0641	0.083
15	0.072	0.0571	0.072
16	0.064	0.0508	0.065
17	0.056	0.0453	0.058
18	0.048	0.0403	0.049
19	0.04	0.0359	0.042
20	0.036	0.032	0.035
21	0.032	0.0285	0.032
22	0.028	0.0253	0.028
23	0.024	0.0226	0.025
24	0.022	0.0201	0.022
25	0.02	0.0179	0.02
26	0.018	0.0159	0.018
27	0.0164	0.0142	0.016
28	0.0148	0.0126	0.014
29	0.0136	0.0113	0.013
30	0.0124	0.01	0.012
31	0.0116	0.0089	0.01
32	0.0108	0.008	0.009
33	0.01	0.0071	0.008
34	0.0092	0.0063	0.007
35	0.0084	0.0056	0.005
36	0.0076	0.005	0.004
37	0.0068	0.0045	–
38	0.006	0.004	–
39	0.0052	0.0035	–
40	0.0048	0.0031	–

Sheet Metal Gauge Thickness Chart Download

Sheet Metal Gauge Chart List

When the sheet metal and the steel sheet have the same gauge, the actual thickness is different and the sheet and pipes are also different too.

FAQ:

How many Inch is 20 gauge?

Standard Steel: 20 Gauge = 0.0359 inches
Galvanized Steel: 20 Gauge = 0.0396 inches

Stainless Steel: 20 Gauge = 0.032 inches
Aluminum: 20 Gauge = 0.0375 inches

What is the thickness of 18 gauge in mm?
standard steel: 1.214 mm
GALVANIZED steel: 1.31 mm
ALUMINUM: 1.024 mm
Stainless Steel: 1.27 mm

Which is thicker 28 or 30 gauge of galvanized steel coil?
28 gauge is thicker. 28 gauge is 0.47mm, 30 gauge is 0.39mm.

Which is thickeness 6 gauge and 16ga steel thickness in mm?
6 gauge is 4.935mm of steel thickness 16 gauge is 1.51mm of steel thickiness

What are the other types of gauges?
Wire gauge (AWG, BWG and SWG) and tube gauge (AWG, BWG and SWG)

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