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International Ring Size Conversion Chart

Britain

Europe

Japan

USA

Diameter
Internal diameter in millimeters

Circumference
Internal circumference in millimeters

. . . 0 11.54 36.25
A . . . 11.90 37.38
. . 0 . 12.00 37.70
A1/2 . . . 12.10 38.01
B . . . 12.30 38.64
. . . 1 12.37 38.86
B1/2 . . . 12.50 39.27
. . . 11/4 12.58 39.52
C . . . 12.70 39.90
. 0.15 . 11/2 12.78 40.15
C1/2 0.53 . . 12.90 40.53
. 0.84 1 13/4 13.00 40.84
. 1.00 . . 13.05 41.00
D 1.15 . . 13.10 41.15
. 1.50 . 2 13.21 41.50
D1/2 1.78 . . 13.30 41.78
. 1.88 2 . 13.33 41.88
. 2.00 . . 13.37 42.00
. 2.13 . 21/4 13.41 42.13
E 2.41 . . 13.50 42.41
. 2.76 . 21/2 13.61 42.76
. 2.91 3 . 13.66 42.91
E1/2 3.00 . . 13.69 43.00
. 3.42 . 23/4 13.82 43.42
F 3.67 . . 13.90 43.67
. 3.98 4 . 14.00 43.98
. 4.00 . . 14.01 44.00
. 4.14 . 3 14.05 44.14

Britain

Europe

Japan

USA

Diameter

Circumference

F1/2 4.30 . . 14.10 44.30
. 4.74 . 31/4 14.24 44.74
G 4.92 . . 14.30 44.92
. 5.00 . . 14.32 45.00
. 5.02 5 . 14.33 45.02
. 5.40 . 31/2 14.45 45.40
G1/2 5.55 . . 14.50 45.55
. 6.00 . . 14.64 46.00
. 6.02 . 33/4 14.65 46.02
. 6.06 6 . 14.66 46.06
H 6.18 . . 14.70 46.18
. 6.68 . 4 14.86 46.68
H1/2 6.81 . . 14.90 46.81
. 7.00 . . 14.96 47.00
. 7.12 7 . 15.00 47.12
. 7.34 . 41/4 15.07 47.34
I 7.44 . . 15.10 47.44
. 7.97 . 41/2 15.27 47.97
. 8.00 . . 15.28 48.00
I1/2 8.07 . . 15.30 48.07
. 8.16 8 . 15.33 48.16
. 8.63 . 43/4 15.48 48.63
J 8.69 . . 15.50 48.69
. 9.00 . . 15.60 49.00
. 9.20 9 . 15.66 49.20

Britain

Europe

Japan

USA

Diameter

Circumference
J1/2 9.32 . 5 15.70 49.32
K 9.95 . 51/4 15.90 49.95
. 10.00 . . 15.92 50.00
. 10.27 10 . 16.00 50.27
K1/2 10.58 . 51/2 16.10 50.58
. 11.00 . . 16.23 51.00
L 11.24 . 53/4 16.31 51.24
. 11.30 11 . 16.33 51.30
L1/2 11.87 . 6 16.51 51.87
. 12.00 . . 16.55 52.00
. 12.34 12 . 16.66 52.34
M 12.46 . . 16.70 52.46
. 12.56 . 61/4 16.73 52.56
. 13.00 . . 16.87 53.00
M1/2 13.09 . . 16.90 53.09
. 13.16 . 61/2 16.92 53.16
. 13.41 13 . 17.00 53.41
N 13.72 . . 17.10 53.72
. 13.85 . 63/4 17.14 53.85
. 14.00 . . 17.19 54.00
N1/2 14.35 . . 17.30 54.35
. 14.44 14 . 17.33 54.44
. 14.51 . 7 17.35 54.51
O 14.98 . . 17.50 54.98
. 15.00 . 71/4 17.56 55.00
. 15.48 15 . 17.66 55.48

Britain

Europe

Japan

USA

Diameter

Circumference
O1/2 15.61 . . 17.70 55.61
. 15.76 . 71/2 17.75 55.76
. 16.00 . . 17.83 56.00
P 16.23 . . 17.90 56.23
. 16.45 . 73/4 17.97 56.45
. 16.55 16 . 18.00 56.55
P1/2 16.86 . . 18.10 56.86
. 17.00 . . 18.14 57.00
. 17.15 . 8 18.19 57.15
Q 17.49 . . 18.30 57.49
. 17.59 17 . 18.33 57.59
. 17.77 . 81/4 18.39 57.77
. 18.00 . . 18.46 58.00
Q1/2 18.12 . . 18.50 58.12
. 18.40 . 81/2 18.59 58.40
. 18.62 18 . 18.66 58.62
R 18.75 . . 18.70 58.75
. 19.00 . 83/4 18.78 59.00
R1/2 19.38 . . 18.90 59.38
. 19.66 . 9 18.99 59.66
. 19.69 19 . 19.00 59.69
S 20.00 . . 19.10 60.00
. 20.38 . 91/4 19.22 60.38
S1/2 20.63 . . 19.30 60.63
. 20.73 20 . 19.33 60.73
. 20.98 . 91/2 19.41 60.98
. 21.00 . . 19.42 61.00

Britain

Europe

Japan

USA

Diameter

Circumference
T 21.26 . . 19.50 61.26
. 21.67 . 93/4 19.63 61.67
. 21.76 21 . 19.66 61.76
T1/2 21.89 . . 19.70 61.89
. 22.00 . . 19.74 62.00
. 22.33 . 10 19.84 62.33
U 22.52 . . 19.90 62.52
. 22.83 22 . 20.00 62.83
. 23.00 . 101/4 20.05 63.00
U1/2 23.15 . . 20.10 63.15
. 23.59 . 101/2 20.24 63.59
V 23.77 . . 20.30 63.77
. 23.87 23 . 20.33 63.87
. 23.99 . .. 20.37 63.99
. 24.28 . 103/4 20.46 64.28
V1/2 24.40 .. .. 20.50 64.40
. 24.91 24 . 20.66 64.91
. 24.97 . 11 20.68 64.97
W 25.00 . . 20.69 65.00
. 25.60 . 111/4 20.88 65.60
W1/2 25.66 . . 20.90 65.66
. 25.97 25 . 21.00 65.97
. 26.00 . . 21.01 66.00
. 26.22 . 111/2 21.08 66.22
X 26.29 .. . 21.10 66.29
X1/2 26.92 . 103/4 21.30 66.92
. 27.01 . . 21.33 67.01
Y 27.51 . 12 21.49 67.51
. 28.02 . . 21.65 68.02
. 28.05 27 . 21.66 68.05
Y1/2 28.20 . 121/4 21.71 68.20
Z 28.77 . 121/2 21.89 68.77
. 28.99 . . 21.96 68.99
. 29.12 28 . 22.00 69.12

Britain

Europe

Japan

USA

Diameter

Circumference
Z1/2 29.43 . . 22.10 69.43
. 29.49 . 123/4 22.12 69.49
Z+1 29.99 . . 22.28 69.99
. 30.15 29 13 22.33 70.15
Z+11/2 30.69 . . 22.50 70.69
. 30.81 . 131/4 22.54 70.81
. 31.00 . . 22.60 71.00
. 31.19 30 . 22.66 71.19
Z+2 31.31 . . 22.70 71.31
. 31.47 . 131/2 22.75 71.47
Z+21/2 32.01 . 133/4 22.92 72.01
. 32.26 31 . 23.00 72.26
Z+3 32.57 . . 23.10 72.57
. 32.76 . 14 23.16 72.76
. 33.01 . . 23.24 73.01
Z+31/2 33.20 . . 23.30 73.20
. 33.32 . . 23.34 73.32
. 33.29 32 . 23.33 73.29
. 33.42 . 141/4 23.37 73.42
Z+4 33.83 . . 23.50 73.83
. 33.98 . 141/2 23.55 73.98
. 34.33 33 . 23.66 74.33
Z+41/2 34.46 . . 23.70 74.46
. 34.71 . 143/4 23.78 74.71
. 34.99 . . 23.87 74.99
Z+5 35.08 . . 23.90 75.08
. 35.40 34 15 24.00 75.40
Z+51/2 35.71 . . 24.10 75.71
. 36.00 . 151/4 24.19 76.00
Z+6 36.34 . . 24.30 76.34
. 36.43 35 . 24.33 76.43
. 36.69 . 151/2 24.41 76.69
Z+61/2 37.00 . . 24.51 77.00
. 37.31 . 153/4 24.61 77.31
. 37.47 36 . 24.66 77.47
Z+7 37.60 . . 24.70 77.60
.. 38.00 . 16 24.83 78.00
Z+71/1 38.23 . . 24.90 78.23
. 38.54 37 161/4 25.00 78.54
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