Sheet Metal Gauge to MM Converter

Find the thickness of a sheet metal gauge in mm and inches. Gauge thickness depends on the metal, so choose the material first.

How to use the Sheet Metal Gauge to MM Converter

Choose the material.
Enter the gauge number.
Read the thickness in mm, inches and mils.

How it works

Sheet metal gauges are historical numbering systems in which a higher number means thinner metal. The same gauge is a different thickness for different metals: 16 gauge is 1.52 mm for standard steel, 1.61 mm for galvanized steel, 1.59 mm for stainless and 1.29 mm for aluminum. Thicknesses here follow the Manufacturers’ Standard Gauge for steel and the Brown & Sharpe gauge for aluminum.

Steel gauge chart

Gauge	Inches	mm
10	0.1345	3.416
12	0.1046	2.657
14	0.0747	1.897
16	0.0598	1.519
18	0.0478	1.214
20	0.0359	0.912
22	0.0299	0.759
24	0.0239	0.607
26	0.0179	0.455
28	0.0149	0.378

Frequently asked questions

How thick is 16 gauge steel?

0.0598 in (1.52 mm).

Which is thicker, 14 or 18 gauge?

14 gauge — lower numbers are thicker.

How thick is 22 gauge?

0.0299 in (0.76 mm) for standard steel.

Is aluminum gauge the same as steel?

No — aluminum of the same gauge is thinner.