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Gauge to mm Converter

Convert any gauge from 7 to 30 to inches and millimetres, for carbon steel, galvanized steel, stainless steel, and aluminum. Pick the metal first — the same gauge number is a different thickness in each system — then pick the gauge. The result comes straight from the published standard tables, the same values as the charts on this site.

Working the other way? If a drawing or a supplier specifies a metric thickness, type it into the reverse converter. It finds the closest published gauge in each of the four metals and shows you the actual thickness of that gauge, so you can see how close the match is before you order. A near match is normal: gauge steps and metric sizes were never designed to line up.

Gauge converter

Steel
0.0598 in
1.519 mm

Reverse: thickness to nearest gauge

Values come from the same published standard tables as the sheet metal gauge chart. Galvanized starts at 8 gauge — no 7 gauge galvanized is published.

Frequently asked questions

How do I convert 16 gauge to mm?

Sixteen gauge converts to 1.52 mm in carbon steel, 1.61 mm galvanized, 1.59 mm in stainless steel, and 1.29 mm in aluminum. There is no single answer without the metal, which is why the converter asks for the material first.

What gauge is 2 mm steel?

Two millimetres sits between 14 gauge (1.897 mm) and 13 gauge (2.278 mm) in carbon steel, closest to 14 gauge. In stainless, 14 gauge is 1.984 mm — an almost exact match. The reverse converter above checks all four metals at once.

Why is there no 7 gauge galvanized option?

Published galvanized tables start at 8 gauge. The galvanized series is the steel series plus a zinc allowance, and manufacturers simply do not publish a 7 gauge galvanized value, so the converter and the chart leave it blank rather than invent one.

Related charts

Thickness values follow Manufacturers' Standard Gauge (ASTM A568) · ASTM A653 (galvanized) · ASTM A480 (stainless) · ASTM B209 (aluminum); cross-checked against published supplier charts, November 2026.