Measure the inside diameter of a ring that fits well, or wrap a paper strip around your finger and measure its length (around). Then find your size:
US SizeDiameterAround
818.1 mm57 mm
918.9 mm59.5 mm
1019.8 mm62.1 mm
1120.6 mm64.6 mm
1221.3 mm67.2 mm
1322.2 mm69.7 mm
Tip: measure at the end of the day. Between two sizes? Go up.
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