Ring Size Calculator
Free toolMeasure your finger's circumference (with a piece of string or a strip of paper, then a ruler) or the inner diameter of a ring that already fits well. Enter the value in millimeters and we calculate your size in the EU, ES, UK and US systems.
How do I measure my size?
Wrap a piece of string or a strip of paper around the base of your finger, mark where it overlaps, and measure that length with a ruler: that is the circumference in millimeters. If you would rather use a ring that already fits well, measure its inner diameter with a ruler.
Your size
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