Standard UK Italy Europe US Jeans
4 XXXS 36 32 0 18-20
6 XXS 38 34 2 20-21
8 XS 40 36 4 22-23
10 S 42 38 6 24-25
12 M 44 40 8 26-27
14 L 46 42 10 28-29
16 XL 48 44 12 30-31
18 XXL 50 46 14 32-33
20 XXXL 52 48 16 34-35
Standard Europe US
3 36 6
3.5 36.5 6.5
4 37 7
4.5 37.5 7.5
5 38 8
5.5 38.5 8.5
6 39 9
6.5 39.5 9.5
7 40 10
7.5 40.5 10.5
8 41 11
8.5 41.5 11.5
9 42 12
9.5 42.5 12.5
10 43 13
Ring Size (UK) MM US Europe
A 37.8 1/2 -
A 1/2 38.4 3/4 -
B 39.1 1 -
B 1/2 39.7 1 1/4 -
C 40.4 1 1/2 -
C 1/2 41 1 3/4 -
D 41.6 2 -
D 1/2 42.3 2 1/4 -
E 42.9 2 1/2 -
E 1/2 43.5 2 3/4 -
F 44.2 3 -
F 1/2 44.8 3 1/4 45
G 45.5 3 1/2 -
G 1/2 46.1 3 3/4 46
H 1/2 46.7 4 -
I 47.4 4 1/4 47
I 1/2 48 4 1/2 48
J 48.7 4 3/4 -
J 1/2 49.3 5 49
K 49.9 5 1/4 50
K 1/2 50.6 5 1/2 -
L 51.2 5 3/4 51
L 1/2 51.8 6 52
M 52.5 6 1/4 -
M 1/2 53.1 6 1/2 -
N 53.8 6 3/4 54
O 54.4 7 -
O 1/2 55 7 1/4 55
P 55.7 7 1/2 56
P 1/2 56.3 7 3/4 -
Q 56.9 8 57
Q 1/2 57.6 8 1/4 -
R 58.2 8 1/2 58
R 1/2 58.9 8 3/4 59
S 59.5 9 -
S 1/2 60.1 9 1/4 60

*Please note that this is only a guide and that measurements/sizing may vary according to the brand and style.