Ring Sizing Guide
Measure the circumference of your finger using paper or string and a ruler - ensure that you measure the widest part, which is usually the knuckle. Alternatively, measure the inside diameter of a ring that fits. All measurements are in millimetres.
UK Size | US Size | Inside Diameter (mm) | Inside Circumference (mm) |
A | 0.5 | 12.04 | 37.8 |
B | 1 | 12.45 | 39.1 |
C | 1.5 | 12.85 | 40.4 |
D | 2 | 13.26 | 41.7 |
E | 2.5 | 13.67 | 42.9 |
F | 3 | 14.07 | 44.2 |
G | 3.5 | 14.48 | 45.5 |
H | 4 | 14.88 | 46.8 |
I | 4.5 | 15.29 | 48 |
J | 4.75 | 15.49 | 48.7 |
K | 5.25 | 15.9 | 50 |
L | 5.75 | 16.31 | 51.2 |
M | 6.25 | 16.71 | 52.5 |
N | 6.75 | 17.12 | 53.8 |
O | 7.25 | 17.53 | 55.1 |
P | 7.75 | 17.93 | 56.3 |
Q | 8.25 | 18.34 | 57.6 |
R | 8.75 | 18.75 | 58.9 |
S | 9.25 | 19.15 | 60.2 |
T | 9.75 | 19.56 | 61.4 |
U | 10.25 | 19.96 | 62.7 |
V | 10.75 | 20.37 | 64 |
W | 11.25 | 20.78 | 65.3 |
X | 11.75 | 21.18 | 66.6 |
Y | 12.25 | 21.59 | 67.8 |
Z | 12.75 | 21.79 | 68.5 |