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Ring Sizes

Understanding British Ring Sizes

Modern Designer Ring

The British ring size system differs from those used in the US and Asia in that the sizes go from A-Z rather than being numeric values. The system also uses a number of 'oversizes' denoted as Z+1, Z+2 etc and half sizes A½, B½ etc. The system dates from early Victorian times when jewellers started producing stock sized rings.

The last British standard BS6820, issued in 1987, defines the ring sizes by inner circumference in mm. Each full size change being an increase of 1.25 mm in inner circumference, thus each half size is an increase of 0.625mm in inner circumference. Technically BS6820 has been superseded by BS28653 defining ring size by inner circumference but British ring sizes A-Z are still in general use.

British Ring Size Dimensions In Inches & Millimetres

SizeInner DiameterInner Circumference
 inmminmm
A0.47011.941.47637.500
0.47812.141.50138.125
B0.48712.331.52638.750
0.49312.531.55039.375
C0.50112.731.57540.000
0.50912.931.59940.625
D0.51713.131.62441.250
0.52513.331.64941.875
E0.53313.531.67342.500
0.54013.731.69843.125
F0.54813.931.72243.750
0.55614.131.74744.375
G0.56414.321.77245.000
0.57214.521.79645.625
H0.58014.721.82146.250
0.58714.921.84546.875
I0.59515.121.87047.500
0.60315.321.89548.125
J0.61115.521.91948.750
0.61915.721.94449.375
K0.62715.921.96950.000
0.63416.111.99350.625
L0.64216.312.01851.250
0.65016.512.04251.875
M0.65816.712.06752.500
0.66916.912.09253.125
N0.67417.112.11653.750
0.68117.312.14154.375
O0.68917.512.16555.000
0.69717.712.19055.625
SizeInner DiameterInner Circumference
 inmminmm
P0.70517.902.21556.250
0.71318.102.23956.875
Q0.72118.302.26457.500
0.72818.502.28858.125
R0.73618.702.31358.750
0.74418.902.33859.375
S0.75219.102.36260.000
0.76019.302.38760.625
T0.76819.502.41161.250
0.77519.702.43661.875
U0.78319.892.46162.500
0.79120.092.48563.125
V0.79920.292.51063.750
0.80720.492.53464.375
W0.81520.692.55965.000
0.82220.892.58465.625
X0.83021.092.60866.250
0.83821.292.63366.875
Y0.84621.492.65767.500
0.85421.682.68268.125
Z0.86221.882.70768.750
0.86922.082.73169.375
Z+10.87722.282.75670.000
Z+20.89322.682.80571.250
Z+30.90923.082.85472.500
Z+40.92423.472.90473.750
Z+50.94023.872.95375.000
Z+60.95624.273.00276.250
Z+70.97124.673.05177.500
Z+80.98725.073.10078.750
Mens Gold and Silver Ring

 

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