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International Ring Finger SizesInformationChard 24 Carat Home Page

Finger Sizes
We get asked about finger size conversions quite frequently, and we have never seen a chart which lists British, European, Japanese, and American systems side by side, so we created our own!
If you wish to order a ring from us, please feel free to specify the finger size in any of these systems.
Diameter = Internal diameter in millimetres.
Circumference = Internal circumference in millimetres.

BritainEuropeJapanUSADiameterCircumference
   011.5436.25
A   11.9037.38
  0 12.0037.70
A1/2   12.1038.01
B   12.3038.64
   112.3738.86
B1/2   12.5039.27
   11/412.5839.52
C   12.7039.90
 0.15 11/212.7840.15
C1/20.53  12.9040.53
 0.84113/413.0040.84
 1.00  13.0541.00

BritainEuropeJapanUSADiameterCircumference
D1.15  13.1041.15
 1.50 213.2141.50
D1/21.78  13.3041.78
 1.882 13.3341.88
 2.00  13.3742.00
 2.13 21/413.4142.13
E2.41  13.5042.41
 2.76 21/213.6142.76
 2.913 13.6642.91
E1/23.00  13.6943.00
 3.42 23/413.8243.42
F3.67  13.9043.67
 3.984 14.0043.98
 4.00  14.0144.00
 4.14 314.0544.14

BritainEuropeJapanUSADiameterCircumference
F1/24.30  14.1044.30
 4.74 31/414.2444.74
G4.92  14.3044.92
 5.00  14.3245.00
 5.025 14.3345.02
 5.40 31/214.4545.40
G1/25.55  14.5045.55
 6.00  14.6446.00
 6.02 33/414.6546.02
 6.066 14.6646.06
H6.18  14.7046.18
 6.68 414.8646.68

BritainEuropeJapanUSADiameterCircumference
H1/26.81  14.9046.81
 7.00  14.9647.00
 7.127 15.0047.12
 7.34 41/415.0747.34
I7.44  15.1047.44
 7.97 41/215.2747.97
 8.00  15.2848.00
I1/28.07  15.3048.07
 8.168 15.3348.16
 8.63 43/415.4848.63
J8.69  15.5048.69
 9.00  15.6049.00
 9.209 15.6649.20

BritainEuropeJapanUSADiameterCircumference
J1/29.32 515.7049.32
K9.95 51/415.9049.95
 10.00  15.9250.00
 10.2710 16.0050.27
K1/210.58 51/216.1050.58
 11.00  16.2351.00
L11.24 53/416.3151.24
 11.3011 16.3351.30
L1/211.87 616.5151.87
 12.00  16.5552.00
 12.3412 16.6652.34
M12.46  16.7052.46
 12.56 61/416.7352.56
 13.00  16.8753.00

BritainEuropeJapanUSADiameterCircumference
M1/213.09  16.9053.09
 13.16 61/216.9253.16
 13.4113 17.0053.41
N13.72  17.1053.72
 13.85 63/417.1453.85
 14.00  17.1954.00
N1/214.35  17.3054.35
 14.4414 17.3354.44
 14.51 717.3554.51
O14.98  17.5054.98
 15.00 71/417.5655.00
 15.4815 17.6655.48

BritainEuropeJapanUSADiameterCircumference
O1/215.61  17.7055.61
 15.76 71/2173/455.76
 16.00  17.8356.00
P16.23  17.9056.23
 16.45 73/417.9756.45
 16.5516 18.0056.55
P1/216.86  18.1056.86
 17.00  18.1457.00
 17.15 818.1957.15
Q17.49  18.3057.49
 17.5917 18.3357.59
 17.77 81/418.3957.77
 18.00  18.4658.00

BritainEuropeJapanUSADiameterCircumference
Q1/218.12  18.5058.12
 18.40 81/218.5958.40
 18.6218 18.6658.62
R183/4  18.70583/4
 19.00 83/418.7859.00
R1/219.38  18.9059.38
 19.66 918.9959.66
 19.6919 19.0059.69
S20.00  19.1060.00
 20.38 91/419.2260.38
S1/220.63  19.3060.63
 20.7320 19.3360.73
 20.98 91/219.4160.98
 21.00  19.4261.00

BritainEuropeJapanUSADiameterCircumference
T21.26  19.5061.26
 21.67 93/419.6361.67
 21.7621 19.6661.76
T1/221.89  19.7061.89
 22.00  19.7462.00
 22.33 1019.8462.33
U22.52  19.9062.52
 22.8322 20.0062.83
 23.00 101/420.0563.00
U1/223.15  20.1063.15
 23.59 101/220.2463.59

BritainEuropeJapanUSADiameterCircumference
V23.77  20.3063.77
 23.8723 20.3363.87
 23.99  20.3763.99
 24.28 103/420.4664.28
V1/224.40  20.5064.40
 24.9124 20.6664.91
 24.97 1120.6864.97
W25.00  20.6965.00
 25.60 111/420.8865.60

BritainEuropeJapanUSADiameterCircumference
W1/225.66  20.9065.66
 25.9725 21.0065.97
 26.00  21.0166.00
 26.22 111/221.0866.22
X26.29  21.1066.29
X1/226.92 103/421.3066.92
 27.0126 21.3367.01
Y27.51 1221.4967.51
 28.02  21.6568.02
 28.0527 21.6668.05
Y1/228.20 121/421.7168.20
Z28.77 121/221.8968.77
 28.99  21.9668.99
 29.1228 22.0069.12

BritainEuropeJapanUSADiameterCircumference
Z1/229.43  22.1069.43
 29.49 123/422.1269.49
Z+129.99  22.2869.99
 30.15291322.3370.15
Z+11/230.69  22.5070.69
 30.81 131/422.5470.81
 31.00  22.6071.00
 31.1930 22.6671.19
Z+231.31  22.7071.31
 31.47 131/2223/471.47
Z+21/232.01 133/422.9272.01
 32.2631 23.0072.26

BritainEuropeJapanUSADiameterCircumference
Z+332.57  23.1072.57
 32.76 1423.1672.76
 33.01  23.2473.01
Z+31/233.20  23.3073.20
 33.32  23.3473.32
 33.2932 23.3373.29
 33.42 141/423.3773.42
Z+433.83  23.5073.83
 33.98 141/223.5573.98
 34.3333 23.6674.33
Z+41/234.46  23.7074.46
 34.71 143/423.7874.71
 34.99  23.8774.99

BritainEuropeJapanUSADiameterCircumference
Z+535.08  23.9075.08
 35.40341524.0075.40
Z+51/235.71  24.1075.71
 36.00 151/424.1976.00
Z+636.34  24.3076.34
 36.4335 24.3376.43
 36.69 151/224.4176.69
Z+61/237.00  24.5177.00
 37.31 153/424.6177.31
 37.4736 24.6677.47
Z+737.60  24.7077.60
 38.00 1624.8378.00
Z+71/238.23  24.9078.23
 38.5437161/425.0078.54

© Lawrence Chard 1999
Other jewellers are welcome to use this chart.
You may ask to copy this chart provided you agree to attach an acknowledgment and copyright notice to your copy.

Formulae:-
Diameter = (British Size x .4) + 11.5; where A = 1, B = 2, Z = 26, etc.
Diameter = (American Size x 0.83) + 11.54
European Size = Circumference - 40
Diameter = (Japanese Size / 3) +12.67


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