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Sheet Metal Thickness Conversion Chart: Galvanized Steel, Stainless Steel, Aluminum

In sheet metal work, the term "gauge" is frequently employed to specify thickness. Gauges are the units used to indicate the thickness of a metal sheet.

Gauge (Ga.) is a unit of measurement for diameters originating in North America, part of the Browne & Sharpe metering system. Initially utilized in fields like medicine and jewelry, the gauge system operates on an inverse relationship: the higher the number, the thinner the diameter. This system now also denotes thickness.

Ga. measurements differ from inches and lack a direct conversion formula. Even if two materials, like non-ferrous metal and steel, share the same gauge, their actual thicknesses vary.

Refer to the chart below for the conversion between gauge measurements and millimeters/inches for various sheet metal materials.

Carbon_Steel_vs_Cast_Iron.jpg

Sheet Metal Gauge to mm

Gauge NumberStandard Steel (mm)Galvanized Steel (mm)Stainless Steel (mm)Aluminum, Brass, Copper (mm)
36.073

5.827
45.095
5.9545.189
55.314
5.5554.62
64.935
5.1594.115
74.554
4.7633.665
84.176
4.1913.264
93.7973.8913.9672.906
103.4163.513.5712.588
113.0383.1323.1752.304
122.6572.7532.7792.052
132.2782.3722.381.829
141.8971.9941.9841.628
151.7091.8031.7861.45
161.5191.6131.5881.29
171.3671.4611.4271.151
181.2141.3111.271.024
191.0621.1581.110.912
200.9121.0060.9530.813
210.8360.930.8740.724
220.7590.8530.7920.643
230.6830.7770.7140.574
240.6070.7010.6350.536
250.5310.6270.5560.455
260.4550.5510.4750.404
270.4170.5130.4370.361
280.3780.4750.3960.32
290.3430.4370.3580.287
300.3050.3990.3180.254
310.2670.3610.2770.226
320.2460.340.2590.203
330.229
0.2390.18
340.208
0.2180.16
350.191
0.1980.142
360.17
0.1780.127
370.163
0.1680.113
380.17
0.1570.101
Sheet Metal Gauge to inch
Gauge NumberStandard Steel (in)Galvanized Steel (in)Stainless Steel (in)Aluminum, Brass, Copper (in)
30.2391

0.2294
40.2242
0.23440.2043
50.2092
0.21870.1819
60.1943
0.20310.162
70.1793
0.18750.1443
80.1644
0.1650.1285
90.14950.15320.15620.1144
100.13450.13820.14060.1019
110.11960.12330.1250.0907
120.10460.10840.10940.0808
130.08970.09340.09370.072
140.07470.07850.07810.0641
150.06730.0710.07030.0571
160.05980.06350.06250.0508
170.05380.05750.05620.0453
180.04780.05160.050.0403
190.04180.04560.04370.0359
200.03590.03960.03750.032
210.03290.03660.03440.0285
220.02990.03360.03120.0253
230.02690.03060.02810.0226
240.02390.02760.0250.0211
250.02090.02470.02190.0179
260.01790.02170.01870.0159
270.01640.02020.01720.0142
280.01490.01870.01560.0126
290.01350.01720.01410.0113
300.0120.01570.01250.01
310.01050.01420.01090.0089
320.00970.01340.01020.008
330.009
0.00940.0071
340.0082
0.00860.0063
350.0075
0.00780.0056
360.0067
0.0070.005
370.0064
0.00660.00445
380.0067
0.00620.00396

The above is the sheet metal specification and thickness table. If you require sheet metal machining services, feel free to reach out to Richconn. We specialize in sheet metal processing and can assist with your specific needs.

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