About Gauge to mm Converter

This free online tool provides accurate gauge to millimeter conversions for Galvanized Steel, Stainless Steel and Aluminum sheet metal.

Because different materials follow different historical gauge standards, the same gauge number does not represent the same physical thickness. Our charts and converter reflect the correct values for each material.

Our Mission

We provide a clean, fast and reliable reference for professionals and users who need trustworthy thickness data without clutter.