What is ring size 5 in mm?

US ring size 5 is 15.7 mm inner diameter and 49.3 mm circumference (EU 49.3, UK J½, Japan 9).

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Ring size 5 in mm

Inner Ø15.7mm

Circumference49.3mm = EU/ISO

UKJ½

JP · CN9

IT · ES · CH9.3

US ring size 5 has an inner diameter of 15.7 mm and an inner circumference of 49.3 mm. The EU/ISO size is that circumference (49.3); in the UK it’s J½, in Japan/China 9, and in Italy/Spain/Switzerland 9.3 (circumference minus 40). Not sure of your size? Measure a ring you own with the on-screen ring sizer.