Converted Size
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Conversion Reference Chart
| US | UK/AU | EU (mm) | Japan | Swiss |
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Measure Diameter
Measure the inside diameter of a ring you already own that fits well, using a precise caliper or ruler.
Measure Circumference
Wrap a piece of string around your finger, mark where it overlaps, and measure the length against a ruler in millimeters.
Pro Tip
Fingers swell throughout the day. Measure your size at the end of the day when they are warmest and largest.