Sheet metal gauge to mm: steel, galvanized, aluminum
The same gauge gives a different thickness for each metal, so choose the metal first, then the gauge.
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How to use it
- Enter metal and gauge.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Steel: Manufacturers' Standard Gauge (thickness = sheet weight in lb/ft² / 41.82). Galvanized: galvanized sheet gauge. Stainless: U.S. Standard Gauge of 1893. Aluminum: the AWG formula. Then mm = in × 25.4.
Example
Inputs: Metal = Steel (carbon), Gauge = 16. Result: Thickness: 1.519 mm; Thickness in inches: 0.0598 in; Gauge table used: Steel (Manufacturers' Standard Gauge).
Limits and caveats
- Thicknesses are nominal; rolling standards allow a plus or minus tolerance.
- Some suppliers use other stainless tables or sell by millimeter, so confirm with yours.
Questions about this tool
How thick is 16 gauge sheet metal in mm?
Steel 1.519 mm, galvanized 1.613 mm, stainless 1.588 mm and aluminum 1.291 mm.
Why is galvanized different from plain steel?
The galvanized table includes the zinc coating, about 0.094 mm thicker at the same number.
Is a higher gauge thicker?
No, a higher gauge is thinner, so 10 gauge is much thicker than 24 gauge.