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Sheet metal thickness gages 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, and is primarily used for sheet steel. For materials such as Aluminum and Brass the thicknesses will be different. Thus a 10 gage steel sheet which has a thickness of 0.1345 inch will weigh 41.82*0.1345 = 5.625 pounds per square foot.

In the U.S the most common sheet metal gage specified is the Steel Gage. In the U.K. the most common sheet metal gage is the British Standard Wire Gage. Black iron, steel sheet, and hooping are specified by the Birmingham Gage, which is different from the Birmingham or Stub's Iron Gage that is used for wire gages.

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If you know the gage number and would like to find out the actual sizes in different standards, enter it here. For sizes larger than 1 use the following: 15/0, 14/0....2/0, 1/0
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Gage No. 12Size in Inch
Steel Gage0.1046
Birmingham Gage (B.G.)0.0991
Galvanized Sheet Gage0.1084
Zinc Gage0.028
Glossary
Negotiate Your Salary

Learn the best principles to negotiate the salary you deserve!

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.