What is ring size 11 in mm?

US ring size 11 is 20.6 mm inner diameter and 64.6 mm circumference (EU 64.6, UK V½, Japan 23).

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Ring size 11 in mm

Inner Ø20.6mm

Circumference64.6mm = EU/ISO

UKV½

JP · CN23

IT · ES · CH24.6

US ring size 11 has an inner diameter of 20.6 mm and an inner circumference of 64.6 mm. The EU/ISO size is that circumference (64.6); in the UK it’s V½, in Japan/China 23, and in Italy/Spain/Switzerland 24.6 (circumference minus 40). Not sure of your size? Measure a ring you own with the on-screen ring sizer.