US (Briller)	Europe	UK & Australia	Diameter (mm)
5	49	J1/2	15.7
6	52	L1/2	16.5
7	54.5	N1/2	17.3
8	57	P1/2	18.2
9	60	R1/2	19
10	62	T1/2	19.8
11	65	V1/2	20.6

 

 Unsure?

 

1. Grab a tape measure, string or strip of paper.

2. Wrap it around the finger you will wear your ring on.

3. Lay your string or paper on a flat surface and use a ruler to measure the length up to the mark. Use the chart above to match the measurements.