Use this guide to compare EU ring sizing with US and UK conversions. Measure the inner diameter of a ring that fits comfortably, or wrap a soft tape around the base of your finger to measure circumference.

How to Measure

1. Using a ring: Measure straight across the inside (inner diameter).

2. Using your finger: Wrap a tape or string around the base of your finger.

3. Match your measurement with the chart below.

EU Size US Size UK Size Inner Diameter Circumference (mm)
46 3.75 H½ 14.6 46
47 4 I 15.0 47
48 4.5 J 15.3 48
49 4.75 J½ 15.6 49
50 5 K 15.9 50
51 5.5 L 16.2 51
52 6 L½ 16.6 52
53 6.25 M½ 16.9 53
54 6.75 N½ 17.2 54
55 7.25 O 17.5 55
56 7.5 P 17.8 56

Irth Tip

Measure at the end of the day when your fingers are naturally slightly larger to ensure a comfortable fit.