Ring Sizing

I often get asked how you can find out your ring size or convert it between UK and US sizing, so to help you work out what size is right for you I have put together a guide and conversion chart.
  

How to find your size

There are two ways to find your ring size. You can either measure the finger you are purchasing a ring for to find the circumference, or you can find your size using a ring you already own by measuring the diameter. 
 

Measuring your finger

Using a tape measure, find out your ring size (in mm) by measuring the circumference around the finger you are purchasing for. Then, use the UK ring size chart below to find the corresponding letter.
 

Measuring an existing ring

Simply measure the inside diameter of an existing ring that fits the finger you are purchasing for and check the measurement against the below UK ring size chart to find the corresponding letter.
  
  
Once you have found your UK ring size, you can convert it to US or EU sizing by using the 'Ring Size Conversion' chart at the bottom of the page. 
 
  

UK Ring Size Chart

Ring size Inside diameter (mm) Inside circumference (mm)
G 14.48 45.5
H 14.88 46.8
I 15.29 48
J 15.49 48.7
K 15.9 50
L 16.31 51.2
M 16.71 52.5
N 17.12 53.8
O 17.53 55.1
P 17.93 56.3
Q 18.34 57.6
R 18.75 58.9
S 19.15 60.2
T 19.56 61.4
U 19.96 62.7
V 20.37 64
W 20.78 65.3
X 21.18 66.6
Y 21.59 67.8
Z 21.79 68.5

 Ring Size Conversion Chart

UK US & Canada EU
G 1/2 45 1/4
1/2 3/4 45 7/8
H 4 46 1/2
1/2 1/4  
I 1/2 47 1/8
J 3/4 48 3/8
1/2 5 49
K 1/4 49 5/8
1/2 1/2 50 1/4
L 3/4 50 7/8
1/2 6 51 1/2
M 1/4 52 1/8
1/2 1/2 52 3/4
N 3/4 53 3/8
O 7 54 5/8
1/2 1/4 55 1/2
P 1/2 55 7/8
1/2 3/4 56 3/4
Q 8 57 1/8
1/2 1/4 58
R 1/2 58 3/8
1/2 3/4 59
S 9 59 5/8
1/2 1/4 60 1/4
- 1/2 60 7/8
T 3/4 61 1/2
1/2 10 62 1/8
U 10 1/4 62 3/4
1/2 10 1/2 63 3/8
V 10 3/4 63 3/8
1/2 11 64 5/8
W 11 1/4 65 1/4
1/2 11 1/2 65 7/8
X 11 3/4 67 1/8
Y 12  
1/2 12 1/4 67 3/4
Z 12 1/2 68 3/8
1/2 12 3/4