What is ring size 3 in mm?

US ring size 3 is 14.1 mm inner diameter and 44.2 mm circumference (EU 44.2, UK F, Japan 4).

Home / Ring size 3 in mm

Ring size 3 in mm

Inner Ø14.1mm

Circumference44.2mm = EU/ISO

UKF

JP · CN4

IT · ES · CH4.2

US ring size 3 has an inner diameter of 14.1 mm and an inner circumference of 44.2 mm. The EU/ISO size is that circumference (44.2); in the UK it’s F, in Japan/China 4, and in Italy/Spain/Switzerland 4.2 (circumference minus 40). Not sure of your size? Measure a ring you own with the on-screen ring sizer.