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Steel Gauge / Gage Thickness Chart

Steel is an alloy consisting mostly of iron, with a carbon content between 0.2% and 2.14% by weight (C:110–10Fe), depending on grade. Steel sheet metal gauge (sometimes spelled "gage") indicates the standard thickness of the sheet metal. As the gauge number increases, the material thickness decreases. The gauge of sheet metal ranges from 35 gauge to about 6 gauge. Thicknesses can vary significantly, although extremely thin thicknesses are considered foil or leaf, and pieces thicker than 6 mm (0.25 in) are considered plate.

Steel Gauge Thickness

Gauge No.	Thickness
Gauge No.	fraction	inch	mm
6	13/64	.2031	5.16
7	3/16	.1875	4.76
8	11/64	.1719	4.37
9	5/32	.1563	3.97
10	9/64	.1406	3.57
11	1/8	.1250	3.18
12	7/64	.1094	2.78
13	3/32	.0938	2.38
14	5/64	.0781	1.98
15	-	.0703	1.79
16	1/16	.0625	1.59
17	-	.0563	1.43
18	-	.0500	1.27
19	-	.0438	1.11
20	-	.0375	.953
21	-	.0344	.873
22	1/32	.0313	.794
23	-	.0218	.714
24	-	.0250	.635
25	-	.0219	.556
26	-	.0188	.478
27	-	.0172	.437
28	1/64	.0156	.396
29	-	.0141	.358
30	-	.0125	.318
31	-	.0109	.277
32	-	.0102	.259
33	-	.0094	.239
34	-	.0086	.218
35	-	.0078	.198

Nonferrous Metal Gauges (aluminum)
vs.
Ferrous Gauges (steel & stainless)

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

Fraction Decimal Millimeter Conversion Table

FRACTION	DECIMAL	MILLIMETER
1/64	.0156	.3969
1/32	.0313	.7938
3/64	.0469	1.1906
1/16	.0625	1.5875
5/64	.0781	1.9844
3/32	.0938	2.3813
7/64	.1094	2.7781
1/8	.125	3.1750
9/64	.1406	3.5719
5/32	.1563	3.9688
11/64	.1719	4.3656
3/16	.1875	4.7625
13/64	.2031	5.1594
7/32	.2188	5.5563
15/64	.2344	5.9531
1/4	.250	6.3500
17/64	.2656	6.7469
9/32	.2813	7.1438
19/64	.2969	7.5406
5/16	.3125	7.9375
21/64	.3281	8.3344
11/32	.3438	8.7313
23/64	.3594	9.1281
3/8	.375	9.5250
25/64	.3906	9.9219
13/32	.4063	10.3188
27/64	.4219	10.7156
7/16	.4375	11.1125
29/64	.4531	11.5094
15/32	.4688	11.9063
31/64	.4844	12.3031
1/2	.500	12.7000
33/64	.5156	13.0969
17/32	.5313	13.4938
35/64	.5499	13.8906
9/16	.5625	14.2875
37/64	.5781	14.6844
19/32	.5938	15.0813
39/64	.6094	15.4781
5/8	.625	15.8750
41/64	.6406	16.2719
21/32	.6563	16.6688
43/64	.6719	17.0656
11/16	.6875	17.4625
45/64	.7031	17.8594
23/32	.7188	18.2563
47/64	.7344	18.6531
3/4	.750	19.0500
49/64	.7656	19.4469
25/32	.7813	19.8438
51/64	.7969	20.2406
13/16	.8125	20.6375
53/64	.8281	21.0344
27/32	.8438	21.4313
55/64	.8594	21.8281
7/8	.875	22.2250
57/64	.8906	22.6219
29/32	.9063	23.0188
59/64	.9219	23.4156
15/16	.9375	23.8125
61/64	.9531	24.2094
31/32	.9688	24.6063
63/64	.9844	25.0031
1	1.00	25.400