How to Measure Sheet Metal Gauge Thickness

Written by stephen lilley
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The gauge of a sheet of metal is a reference to how thick it is. The higher the numbered gauge a piece of metal is, the thicker the piece is in millimetres. If you want to find out what gauge your sheet metal is, measure its thickness using a regular tape measure. Then, using a sheet metal gauge chart, you can match that thickness up with the appropriate numbered gauge of your product.

Skill level:

Things you need

  • Tape measure

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  1. 1

    Use a tape measure to find the thickness of your sheet metal piece. Use the millimetre hash marks to find the most accurate measurement possible.

  2. 2

    Multiply the number of millimetres by 0.03937 to convert to inches. If your measurement was 55 millimetres, for example, you would be left with 2.16535 inches.

  3. 3

    Compare the thickness of your sheet metal in inches to a sheet metal gauge chart to find the proper gauge of that particular piece. For example, if your sheet metal is 0.2391 inches, it would have a gauge of 3.

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