How to find your ring size

Option 1: Measure a ring you own
Place it on a ruler and measure the inner diameter in millimetres, edge to edge across the centre. Compare it with the table below.

Option 2: Measure your finger
Wrap a thin strip of paper or string around the base of your finger. Mark where it overlaps, then measure that length in millimetres. Compare it with the table below.

Tips

Measure at the end of the day, when fingers are a little larger.
If your knuckle is wider than the base of your finger, measure both and choose a size in between.
For wide bands, size up if you're between two sizes.

Size	Diameter	Circumference	UK
8	15,0 mm	48 mm	I
9	15,3 mm	49 mm	J
10	15,6 mm	50 mm	K
11	16,0 mm	51 mm	L
12	16,3 mm	52 mm	L
13	16,6 mm	53 mm	M
14	17,0 mm	54 mm	N
15	17,3 mm	55 mm	O
16	17,6 mm	56 mm	O
17	18,0 mm	57 mm	P
18	18,3 mm	58 mm	Q
19	18,6 mm	59 mm	R
20	19,0 mm	60 mm	S
21	19,3 mm	61 mm	S
22	19,6 mm	62 mm	T
23	20,0 mm	63 mm	U
24	20,3 mm	64 mm	V
25	20,6 mm	65 mm	V
26	21,0 mm	66 mm	W
27	21,3 mm	67 mm	X
28	21,6 mm	68 mm	Y
29	22,0 mm	69 mm	Z
30	22,3 mm	70 mm	Z