What is guage of sheet metal equal to in thousands of an inch ?

Example: 20 guage = .??? or 28 guage = .???What is guage of sheet metal equal to in thousands of an inch ?
The conversion varies by what type of metal it is. Here are some sites with examples:


http://www.unc.edu/~rowlett/units/scales鈥?/a>


http://www.engineersedge.com/gauge.htmWhat is guage of sheet metal equal to in thousands of an inch ?
Ferrous or Non Ferrous? To make matters confusing, they are different. In your example 20 gauge steel is 35.9 thousandths, while brass sheets would be 32 thousandths. They don't go as thin as 28 gauge in sheets, only wire that I know of.