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Sheet Metal Gauge Chart

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Sheet metal gauge (or gage) numbers refer to the thickness of sheet metal. This thickness is measured in either mm or in thousandths of an inch (in). The higher the gauge, the thinner the sheet metal (except for Zinc).

The gauge size for each type of material differs and is determined by weight.

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).

Sheet Metal Gauge Chart (Metric - mm)

Gauge #Standard SteelGalvanized SteelStainless SteelAluminumBirmingham GageZinc
0000000--12.700-16.932-
000000--11.90214.73215.875-
00000--11.11313.11914.943-
0000--10.32011.68413.757-
000--9.52510.40412.700-
00--8.7339.26611.308-
0--7.9388.25210.069-
1--7.1457.3488.9710.051
2--6.7466.5437.9930.102
36.073-6.3505.8277.1220.152
45.695-5.9545.1896.350.203
55.314-5.5554.6205.6520.254
64.935-5.1594.1155.0320.305
74.554-4.7633.6654.4810.356
84.1764.2704.3663.2643.9880.406
93.7973.8913.9672.9063.5510.457
103.4163.5103.5712.5883.1750.508
113.0383.1323.1752.3042.8270.610
122.6572.7532.7792.0522.5170.711
132.2782.3722.3801.8292.240.813
141.8971.9941.9841.6281.9940.914
151.7091.8031.7861.4501.7751.016
161.5191.6131.5881.2901.5881.143
171.3671.4611.4271.1511.4121.270
181.2141.3111.2701.0241.2571.397
191.0621.1581.1100.9121.1181.524
200.9121.0060.9530.8130.9961.778
210.8360.9300.8740.7240.8862.032
220.7590.8530.7920.6430.7922.286
230.6830.7770.7140.5740.7062.540
240.6070.7010.6350.5110.6273.175
250.5310.6270.5560.4550.5596.350
260.4550.5510.4750.4040.4989.525
270.4170.5130.4370.3610.44212.700
280.3780.4750.3960.3200.39625.400
290.3430.4370.3580.2870.353-
300.3050.3990.3180.2540.312-
310.2670.3610.2770.2260.279-
320.2460.3400.2590.2030.249-
330.229-0.2390.1800.221-
340.208-0.2180.1600.196-
350.191-0.1980.1420.175-
360.170-0.1780.1270.155-
370.163-0.1680.1140.137-
380.152-0.1570.1020.122-
39---0.0890.109-
40---0.0790.097-
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 SteelGalvanized SteelStainless SteelAluminumBirmingham GageZinc
0000000--0.5000-0.6666-
000000--0.46860.58000.6250-
00000--0.43750.51650.5883-
0000--0.40630.46000.5416-
000--0.37500.40960.5000-
00--0.34380.36480.4452-
0--0.31250.32490.3964-
1--0.28130.28930.35320.0020
2--0.26560.25760.31470.0040
30.2391-0.25000.22940.28040.0060
40.2242-0.23440.20430.25000.0080
50.2092-0.21870.18190.22250.0100
60.1943-0.20310.16200.19810.0120
70.1793-0.18750.14430.17640.0140
80.16440.16810.17190.12850.15700.0160
90.14950.15320.15620.11440.13980.0180
100.13450.13820.14060.10190.12500.0200
110.11960.12330.12500.09070.11130.0240
120.10460.10840.10940.08080.09910.0280
130.08970.09340.09370.07200.08820.0320
140.07470.07850.07810.06410.07850.0360
150.06730.07100.07030.05710.06990.0400
160.05980.06350.06250.05080.06250.0450
170.05380.05750.05620.04530.05560.0500
180.04780.05160.05000.04030.04950.0550
190.04180.04560.04370.03590.04400.0600
200.03590.03960.03750.03200.03920.0700
210.03290.03660.03440.02850.03490.0800
220.02990.03360.03120.02530.03120.0900
230.02690.03060.02810.02260.02780.1000
240.02390.02760.02500.02010.02470.1250
250.02090.02470.02190.01790.02200.2500
260.01790.02170.01870.01590.01960.3750
270.01640.02020.01720.01420.01740.5000
280.01490.01870.01560.01260.01561.0000
290.01350.01720.01410.01130.0139-
300.01200.01570.01250.01000.0123-
310.01050.01420.01090.00890.0110-
320.00970.01340.01020.00800.0098-
330.0090-0.00940.00710.0087-
340.0082-0.00860.00630.0077-
350.0075-0.00780.00560.0069-
360.0067-0.00700.00500.0061-
370.0064-0.00660.00450.0054-
380.0060-0.00620.00400.0048-
39---0.00350.0043-
40---0.00310.0038-
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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