Steel & Aluminum Metal Gauges

Use the chart below to convert standard gauge numbers in decimals of an inch for sheet steel, aluminum and stainless steel.

Gauge #	Sheet Steel	Aluminum	Stainless Steel
1	—	.2893 (7.3)	.2812 (7.1)
2	—	.2576 (6.5)	.2656 (6.7)
3	.2391 (6.1)	.2294 (5.8)	.2500 (6.4)
4	.2242 (5.7)	.2043 (5.2)	.2344 (6.0)
5	.2092 (5.3)	.1819 (4.6)	.2187 (5.6)
6	.1943 (4.9)	.1620 (4.1)	.2031 (5.2)
7	.1793 (4.6)	.1443 (3.7)	.1875 (4.8)
8	.1644 (4.2)	.1285 (3.3)	.1719 (4.4)
9	.1495 (3.8)	.1144 (2.9)	.1562 (4.0)
10	.1345 (3.4)	.1019 (2.6)	.1406 (3.6)
11	.1196 (3.0)	.0907 (2.3)	.1250 (3.2)
12	.1046 (2.7)	.0808 (2.1)	.1094 (2.8)
13	.0897 (2.3)	.0720 (1.8)	.0937 (2.4)
14	.0747 (1.9)	.0641 (1.6)	.0781 (2.0)
15	.0673 (1.7)	.0571 (1.5)	.0703 (1.8)
16	.0598 (1.5)	.0508 (1.3)	.0625 (1.6)
17	.0538 (1.4)	.0453 (1.2)	.0562 (1.4)
18	.0478 (1.2)	.0403 (1.0)	.0500 (1.3)
19	.0418 (1.1)	.0359 (0.9)	.0437 (1.1)
20	.0359 (0.9)	.0320 (0.8)	.0375 (1.0)
21	.0329 (0.8)	.0285 (0.7)	.0344 (0.9)
22	.0299 (0.8)	.0253 (0.6)	.0312 (0.8)
23	.0269 (0.7)	.0226 (0.6)	.0281 (0.7)
24	.0239 (0.6)	.0201 (0.5)	.0250 (0.6)
25	.0209 (0.6)	.0179 (0.5)	.0219 (0.6)
26	.0179 (0.5)	.0159 (0.4)	.0187 (0.5)
27	.0164 (0.4)	.0142 (0.4)	>.0172 (0.4)
28	.0149 (0.4)	.0126 (0.3)	.0156 (0.4)
29	.0135 (0.3)	.0113 (0.3)	.0141 (0.3)

Dimension in inches (millimeters)