What is ring size 13 in mm?

US ring size 13 is 22.2 mm inner diameter and 69.7 mm circumference (EU 69.7, UK Z+1, Japan 27).

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Ring size 13 in mm

Inner Ø22.2mm

Circumference69.7mm = EU/ISO

UKZ+1

JP · CN27

IT · ES · CH29.7

US ring size 13 has an inner diameter of 22.2 mm and an inner circumference of 69.7 mm. The EU/ISO size is that circumference (69.7); in the UK it’s Z+1, in Japan/China 27, and in Italy/Spain/Switzerland 29.7 (circumference minus 40). Not sure of your size? Measure a ring you own with the on-screen ring sizer.