To know your size, use a piece of rope to wrap around your finger, cut or mark the rope where the two ends meet, and measure with a ruler.

Ring sizes are listed in milimeters (diameter). You can also use the table below to help you figure out your size. Remember some rings can be adjusted for size:

Size	Diameter	Circumference
US 6	16.5 mm	51.9 mm
US 7	17.3 mm	54.4 mm
US 8	18.1 mm	57 mm
US 9	18.9 mm	59.5 mm
US 10	19.8 mm	62.1 mm
US 11	20.6 mm	64.6 mm
US 12	21.4 mm	67.2 mm
US 13	22.2 mm	70 mm