What is ring size 7 in mm?

US ring size 7 is 17.3 mm inner diameter and 54.4 mm circumference (EU 54.4, UK N½, Japan 14).

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Ring size 7 in mm

Inner Ø17.3mm

Circumference54.4mm = EU/ISO

UKN½

JP · CN14

IT · ES · CH14.4

US ring size 7 has an inner diameter of 17.3 mm and an inner circumference of 54.4 mm. The EU/ISO size is that circumference (54.4); in the UK it’s N½, in Japan/China 14, and in Italy/Spain/Switzerland 14.4 (circumference minus 40). Not sure of your size? Measure a ring you own with the on-screen ring sizer.