Determine your ring size by using either of the below methods.
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Method 1: Use a ring you already have and measure the internal diameter with a ruler.
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Method 2: Wrap a strip of paper around your finger, mark where the paper meets and measure the paper with a ruler.
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Use this chart to determine your size!
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Internal Diameter (mm)
 US Size   3  |  14.1 mm 
US Size   4  |  14.9 mm
US Size   5  |  15.7 mm
 US Size   6  |  16.5 mm 
 US Size   7  |  17.3 mm 
 US Size   8  |  18.1 mm 
US Size   9  |  19.0 mm
US Size 10  |  19.8 mm
US Size 11  |  20.6 mm
US Size 12  |  21.4 mm
US Size 13  |  22.2 mm