Calculate sheet metal gauge or thickness in mm, inches, centimeters, or feet for steel and aluminum by entering the known value and material type.
| Gauge to mm | mm to nearest Gauge |
|---|---|
| 3 gauge = 6.0731 mm | 0.50 mm ≈ 25 gauge |
| 4 gauge = 5.6947 mm | 0.75 mm ≈ 22 gauge |
| 5 gauge = 5.3137 mm | 1.00 mm ≈ 19 gauge |
| 6 gauge = 4.9352 mm | 1.50 mm ≈ 16 gauge |
| 7 gauge = 4.5542 mm | 2.00 mm ≈ 14 gauge |
| 8 gauge = 4.1758 mm | 3.00 mm ≈ 11 gauge |
| 9 gauge = 3.7973 mm | 4.00 mm ≈ 8 gauge |
| 10 gauge = 3.4163 mm | 6.00 mm ≈ 3 gauge |
| Nominal uncoated sheet steel (MSG) chart; multiply listed inches by 25.4. Reverse values are nearest reference gauges, not tolerances. | |
| Gauge to mm | mm to nearest Gauge |
|---|---|
| 1 gauge = 7.3482 mm | 0.80 mm ≈ 20 gauge |
| 2 gauge = 6.5430 mm | 1.00 mm ≈ 18 gauge |
| 3 gauge = 5.8268 mm | 1.27 mm ≈ 16 gauge |
| 4 gauge = 5.1892 mm | 2.00 mm ≈ 12 gauge |
| 5 gauge = 4.6203 mm | 3.00 mm ≈ 9 gauge |
| 6 gauge = 4.1148 mm | 4.00 mm ≈ 6 gauge |
| 7 gauge = 3.6652 mm | 5.00 mm ≈ 4 gauge |
| 8 gauge = 3.2639 mm | 6.35 mm ≈ 2 gauge |
| Nominal aluminum sheet (Brown & Sharpe) chart; multiply listed inches by 25.4. Reverse values are nearest reference gauges, not tolerances. | |
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Gauge To mm Formula
Sheet-metal gauge requires a material-specific nominal thickness table. Convert the listed inch value to millimeters with the exact factor 25.4.
Variables:
- mm is the thickness in millimeters
- G is the gauge number
Look up the integer gauge in the selected reference chart, then multiply its nominal inch thickness by 25.4. The reverse calculator returns the closest listed gauge and the difference from measured thickness. It does not interpolate fractional gauges or determine manufacturing tolerances. Uncoated sheet steel uses Manufacturers Standard Gauge; aluminum uses Brown & Sharpe values. Stainless, galvanized steel, wire and plastic-film gauges require different references.
What Does “Gauge to mm” Mean?
Gauge to mm is a conversion used to measure the thickness of materials such as metal and plastic. Gauge is a standard unit of measure for sheet metal and wire products, but it is not universally standardized and varies between material types. Therefore, it is often converted to millimeters (mm) for a more universally understood measurement. The higher the gauge number, the thinner the material. For example, a 16-gauge metal is thinner than a 10-gauge metal.
