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Sheet Metal Gauge Table | Steel, Aluminum, Copper, and Brass

Gauge numbers are a quick shorthand for thickness, but the same gauge can mean different thicknesses depending on whether you’re working with steel, aluminum, copper, or brass, which is why “steel gauge and thickness” often needs a second check.

The chart below is a practical sheet metal gauge chart and sheet metal gauge table that converts common sheet metal gauges into actual thickness by material. Use it to verify callouts like 11 gauge steel thickness, 12 gauge steel thickness, or 18 gauge steel thickness, and to avoid mix-ups when specifying, quoting, or fabricating from a metal gauge thickness chart.

Gauge
Mild Steel
Stainless Steel
Galvanized Steel
Aluminum
Copper
Brass
3
0.2391(6.07 mm)
0.2500(6.35 mm)
0.2391(6.07 mm)
0.2294(5.83 mm)
0.2294(5.83 mm)
0.2294(5.83 mm)
4
0.2242(5.69 mm)
0.2344(5.95 mm)
0.2242(5.69 mm)
0.2043(5.19 mm)
0.2043(5.19 mm)
0.2043(5.19 mm)
5
0.2092(5.31 mm)
0.2188(5.56 mm)
0.2092(5.31 mm)
0.1819(4.62 mm)
0.1819(4.62 mm)
0.1819(4.62 mm)
6
0.1943(4.94 mm)
0.2031(5.16 mm)
0.1943(4.94 mm)
0.1620(4.11 mm)
0.1620(4.11 mm)
0.1620(4.11 mm)
7
0.1793(4.55 mm)
0.1875(4.76 mm)
0.1793(4.55 mm)
0.1443(3.67 mm)
0.1443(3.67 mm)
0.1443(3.67 mm)
8
0.1644(4.18 mm)
0.1719(4.37 mm)
0.1644(4.18 mm)
0.1285(3.26 mm)
0.1285(3.26 mm)
0.1285(3.26 mm)
9
0.1495(3.80 mm)
0.1562(3.97 mm)
0.1495(3.80 mm)
0.1144(2.91 mm)
0.1144(2.91 mm)
0.1144(2.91 mm)
10
0.1345(3.42 mm)
0.1406(3.57 mm)
0.1345(3.42 mm)
0.1019(2.59 mm)
0.1019(2.59 mm)
0.1019(2.59 mm)
11
0.1196(3.04 mm)
0.1250(3.18 mm)
0.1196(3.04 mm)
0.0907(2.30 mm)
0.0907(2.30 mm)
0.0907(2.30 mm)
12
0.1046(2.66 mm)
0.1094(2.78 mm)
0.1046(2.66 mm)
0.0808(2.05 mm)
0.0808(2.05 mm)
0.0808(2.05 mm)
13
0.0897(2.28 mm)
0.0938(2.38 mm)
0.0897(2.28 mm)
0.0720(1.83 mm)
0.0720(1.83 mm)
0.0720(1.83 mm)
14
0.0747(1.90 mm)
0.0781(1.98 mm)
0.0747(1.90 mm)
0.0641(1.63 mm)
0.0641(1.63 mm)
0.0641(1.63 mm)
15
0.0673(1.71 mm)
0.0703(1.79 mm)
0.0673(1.71 mm)
0.0571(1.45 mm)
0.0571(1.45 mm)
0.0571(1.45 mm)
16
0.0598(1.52 mm)
0.0625(1.59 mm)
0.0598(1.52 mm)
0.0508(1.29 mm)
0.0508(1.29 mm)
0.0508(1.29 mm)
17
0.0538(1.37 mm)
0.0562(1.43 mm)
0.0538(1.37 mm)
0.0453(1.15 mm)
0.0453(1.15 mm)
0.0453(1.15 mm)
18
0.0478(1.21 mm)
0.0500(1.27 mm)
0.0478(1.21 mm)
0.0403(1.02 mm)
0.0403(1.02 mm)
0.0403(1.02 mm)
19
0.0418(1.06 mm)
0.0438(1.11 mm)
0.0418(1.06 mm)
0.0359(0.91 mm)
0.0359(0.91 mm)
0.0359(0.91 mm)
20
0.0359(0.91 mm)
0.0375(0.95 mm)
0.0359(0.91 mm)
0.0320(0.81 mm)
0.0320(0.81 mm)
0.0320(0.81 mm)
21
0.0329(0.84 mm)
0.0344(0.87 mm)
0.0329(0.84 mm)
0.0285(0.72 mm)
0.0285(0.72 mm)
0.0285(0.72 mm)
22
0.0299(0.76 mm)
0.0312(0.79 mm)
0.0299(0.76 mm)
0.0253(0.64 mm)
0.0253(0.64 mm)
0.0253(0.64 mm)
23
0.0269(0.68 mm)
0.0281(0.71 mm)
0.0269(0.68 mm)
0.0226(0.57 mm)
0.0226(0.57 mm)
0.0226(0.57 mm)
24
0.0239(0.61 mm)
0.0250(0.64 mm)
0.0239(0.61 mm)
0.0201(0.51 mm)
0.0201(0.51 mm)
0.0201(0.51 mm)
25
0.0209(0.53 mm)
0.0219(0.56 mm)
0.0209(0.53 mm)
0.0179(0.45 mm)
0.0179(0.45 mm)
0.0179(0.45 mm)
26
0.0179(0.45 mm)
0.0188(0.48 mm)
0.0179(0.45 mm)
0.0159(0.40 mm)
0.0159(0.40 mm)
0.0159(0.40 mm)
27
0.0164(0.42 mm)
0.0172(0.44 mm)
0.0164(0.42 mm)
0.0142(0.36 mm)
0.0142(0.36 mm)
0.0142(0.36 mm)
28
0.0149(0.38 mm)
0.0156(0.40 mm)
0.0149(0.38 mm)
0.0126(0.32 mm)
0.0126(0.32 mm)
0.0126(0.32 mm)
29
0.0135(0.34 mm)
0.0141(0.36 mm)
0.0135(0.34 mm)
0.0113(0.29 mm)
0.0113(0.29 mm)
0.0113(0.29 mm)
30
0.0120(0.30 mm)
0.0125(0.32 mm)
0.0120(0.30 mm)
0.0100(0.25 mm)
0.0100(0.25 mm)
0.0100(0.25 mm)

MISUMI USA carries a wide range of industrial manufacturing components – including Sheet Metal Tools, and Mounting Plates for Sheet Metal – for your next project or machine fix. If you have any questions about measurement or sizing for your sheet metal needs, feel free to connect with our product experts, and engineers. Also, if you are looking for more insights be sure to check out our other blog articles, including: All About Metal Alloys, What is Mild Steel?, and more.

Author: Scott Bredemann | Updated: 1/29/2026

Disclaimer:
The content on this webpage is for informational purposes only. MISUMI makes no guarantees, expressed or implied, regarding the accuracy, completeness, or validity of the information. Performance parameters, tolerances, designs, materials, or processes should not be assumed to reflect third-party suppliers’ or manufacturers’ deliverables within MISUMI’s network. Buyers are responsible for specifying their part requirements.