Ring Size Conversion for US, UK, AUS, Canada & China

Convert between American (US), UK, Australian, Canadian & Chinese ring sizes including the diameters in inches and millimeters (mm).

Please note that there is no real international standard for ring sizes. You may need to contact to the manufacturer for the accurate measurement.

For all clothing and shoes size tables, please check size conversions.

Ring Size Table

US / CANUK / AUSJapanChinaDiameter (inch)Diameter (mm)
0---0.45811.63
¼---0.46611.84
½A--0.47412.04
¾--0.48212.24
1B110.4912.45
--0.49812.65
C--0.50612.85
--0.51413.06
2D220.52213.26
--0.5313.46
E330.53813.67
--0.54613.87
3F440.55414.07
550.56214.27
G--0.5714.48
660.57814.68
4H770.58614.88
--0.59415.09
I880.60215.29
J--0.6115.49
5990.61815.70
K--0.62615.90
10100.63416.10
L--0.64216.31
611110.6516.51
M12120.65816.71
13130.66616.92
N--0.67417.12
714140.68217.32
O--0.6917.53
15150.69817.73
P--0.70617.93
816160.71418.14
Q--0.72218.34
17170.7318.54
R--0.73818.75
918180.74618.95
S--0.75419.15
19190.76219.35
T--0.7719.56
1020200.77819.76
10¼U21210.78619.96
10½22220.79420.17
10¾V--0.80220.37
1123230.8120.57
11¼W--0.81820.78
11½24240.82620.98
11¾X--0.83421.18
1225250.84221.39
12¼Y--0.8521.59
12½Z26260.85821.79
12¾--0.86622.00
13-27270.87422.20
13¼Z1--0.88222.40
13½---0.8922.61
13¾Z2--0.89822.81
14Z3--0.90623.01
14¼---0.91423.22
14½Z4--0.92223.42
14¾---0.9323.62
15---0.93823.83
15¼---0.94624.03
15½---0.95424.23
15¾---0.96224.43
16---0.9724.64