Ring Width Visualization Chart
If you don't happen to have a millimeter gauge handy at the moment, all you need is the loose change in your pocket. The chart below shows which coin denominations to stack-up to get your desired ring widths from 2mm to 12mm.
Widths & Denominations
2mm = 1-Nickel
2.5mm = 2-Dimes
3mm = 1-Dime and 1-Penny
4mm = 1-Penny and 2 Dimes
5mm = 3-Quarters
6mm = 2-Quarters and 2-Dimes
7mm = 2-Quarters and 2-Nickels
8mm = 3-Quarters and 2-Pennies
9mm = 4-Quarters and 2-Dimes
10mm = 6-Quarters
11mm = 5-Quarters and 2-Pennies
12mm = 6-Quarters and 1-Nickel
International Ring Size Conversion Chart
If you're not familiar with the U.S. and Canadian ring sizes, perhaps you'll find a ring size term you're more familiar with on the international ring size chart below.