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Sheet Metal Gauge Charts

Every chart on this site uses the same published standard tables and covers gauges 7 to 30 (8 to 30 for galvanized). Start with the combined chart if you are comparing metals, or go straight to the chart for the metal you are buying.

Sheet metal gauge chart — all four metals

The combined chart: every gauge, every metal, inches and mm side by side.

Steel sheet metal gauge chart

Steel only: full table under Manufacturers' Standard Gauge (ASTM A568). 16 ga = 0.0598 in.

Galvanized sheet metal gauge chart

Galvanized only: full table under MSG + 0.0037 in zinc allowance (ASTM A653); no gauge 7 published. 16 ga = 0.0635 in.

Stainless steel sheet metal gauge chart

Stainless steel only: full table under Stainless sheet gauge series, fraction-based (ASTM A480). 16 ga = 0.0625 in.

Aluminum sheet metal gauge chart

Aluminum only: full table under Brown & Sharpe / AWG (ASTM B209), t = 0.005 x 92^((36-n)/39). 16 ga = 0.0508 in.

Gauge to mm converter

Convert gauge to inches and mm, or find the nearest gauge for a metric thickness.

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.