FAQ about Gauge Conversion

1. How many mm is 8 gauge? Standard Steel: 8 Gauge = 4.176 mm. Stainless Steel: 8 Gauge = 4.191 mm.
2. What is 10 gauge in mm? Standard Steel: 10 Gauge = 3.416 mm. Galvanized Steel: 10 Gauge = 3.51 mm.
3. What is 16 gauge thickness in mm? Standard Steel: 16 Gauge = 1.519 mm.

Sheet metal thickness gauges for steel are based on a weight of 41.82 pounds per square foot per inch of thickness. This is known as the Manufacturers’ Standard Gage for Sheet Steel. Thus, a 10 gauge steel sheet which has a thickness of 0.1345 inches will weigh 41.82*0.1345 = 5.625 pounds per square foot.

To find the thickness in inches of galvanized steel, add 0.0010 inches on to the theoretical decimal thickness you solved for. For example, you found your gauge decimal thickness to be 0.1644. Adding 0.0010 inches to 0.1644 gives you 0.1654 as a gauge decimal (inches) for the thickness of your galvanized steel sheet.

In short, the smaller the gauge of a shotgun, the larger the bore diameter. This is why a 10 gauge shotgun has a larger diameter than a 12 gauge shotgun, which has a larger diameter than a 20 gauge shotgun, etc.

How to Measure Sheet Metal Gauge Thickness

1. Use a tape measure to find the thickness of your sheet metal piece.
2. Multiply the number of millimeters by 0.03937 to convert to inches.
3. Compare the thickness of your sheet metal in inches to a sheet metal gauge chart to find the proper gauge of that particular piece.

“Here [in the U.S.] it’s measured by gauge.” Gauge sizes work in reverse, meaning that the higher the number, the thinner the width. So higher numbers (like 16 gauge) are thinner than smaller numbers (like a 6 gauge). When discussing gauges, references to a “larger gauge” means bigger around, not a bigger number.

Ga. is different from inches, there is no conversion formula. Even when the non-ferrous metal plate and the steel plate are the same Ga., the thickness is actually different. You can find the gauge to mm / inch conversion for sheet metal by the chart below.

The unit to measure the thickness of the steel (or) sheet metal is called as the gauge. Most used steel sheet metals have gauge values between 30 and 7. In this conversion calculator, you can convert gauge to inches and millimeters from the known gauge number.

In this conversion calculator, you can convert gauge to inches and millimeters from the known gauge number. If the Birmingham wire gauge has a gauge number of 8, the diameter of the wire will be 0.165 inches and 4.191 mm. For a US standard gauge, it would be 0.1719 inches and 4.37 mm.

Sheet Metal Gauge to inch Gauge Number Standard Steel (in) Galvanized Steel (in) Stainless Steel (in) Aluminum, Brass, Copper (in) 12 0.1046 0.1084 0.1094 0.0808 13 0.0897 0.0934 0.0937 0.072 14 0.0747 0.0785 0.0781 0.0641 15 0.0673 0.071 0.0703 0.0571