What is ring size 8 in mm?

US ring size 8 is 18.1 mm inner diameter and 57.0 mm circumference (EU 57.0, UK P½, Japan 16).

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Ring size 8 in mm

Inner Ø18.1mm

Circumference57.0mm = EU/ISO

UKP½

JP · CN16

IT · ES · CH17.0

US ring size 8 has an inner diameter of 18.1 mm and an inner circumference of 57.0 mm. The EU/ISO size is that circumference (57.0); in the UK it’s P½, in Japan/China 16, and in Italy/Spain/Switzerland 17.0 (circumference minus 40). Not sure of your size? Measure a ring you own with the on-screen ring sizer.