Calculate your ring size

Ring size (D, FR) Ring size (IT,SP) Inner diameter (mm) Circumference (mm)
48 8 15.3 48
50 10 15.9 50
52 12 16.6 52
54 14 17.2 54
56 16 17.8 56
58 18 18.5 58
60 20 19.1 60
62 22 19.7 62
64 24 20.3 64
66 26 21.0 66