Ring Size Measurement & Ring Size Conversion Chart

Find and convert your ring size using our advice below. Our ring size conversion chart includes finger circumference and UK, US and EU sizing in a conversion table.

Whilst having your ring finger measured using a jeweller’s ring sizing set is always optimal, measuring your finger yourself and converting the measurement into your ring size is also a good option.

Please read the instructions below carefully and convert your measurements into the appropriate ring size.

How to measure ring size

Follow these steps to measure your finger and find your ring size. We recommend measuring your finger circumference in millimetres (mm) – and have provided sizing this way in our Ring Size Conversion Chart.

Wrap a piece of string or ribbon around the base of the finger you’d wear the ring on. Avoid doing this when you are very hot or cold.
With a pen, mark the point where the end of the string or ribbon meets.
Slide the still wrapped loop up your finger to check that this length of string will also fit over your knuckle.
Lay out the string or piece of ribbon and use a ruler to measure the string in millimetres (mm).
Use our ring size conversion chart to select your ring size.

Ring Size Conversion Chart

UK Ring Size:	US Ring Size:	EU Ring Size:	Circumference (mm):
G	3 ^1/4	45	45
G ^1/2	–	–	–
H	3 ^3/4	46	46
H ^1/2	4	47	47
I	–	–	–
I ^1/2	4 ^1/2	48	48
J	–	–	–
J ^1/2	4 ^3/4	49	49
K	5 ^1/4	50	50
K^1/2	5 ^1/2	–	–
L	5 ^3/4	51	51
L^1/2	6	52	52
M	6 ^1/4	52.5	52.5
M^1/2	6 ^1/2	53	53
N	6^1/2	53	53.8
N ^1/2	7	54	54
O	7 ^1/4	55	55
O ^1/2	7 ^1/2	55	55
P	7 ^3/4	56	56
P ^1/2	8	57	57
Q	–	–	–
Q ^1/2	8 ^1/4	58	58
R	8 ^3/4	59	59
R^1/2	9
S	9 ^1/4	60	60
S ^1/2	9 ^1/2	61	61
T	9 ^3/4	–	–
T^1/2	10	62	62
U	10^1/4	–	–
U ^1/2	10 ^1/2	63	63
V	10^3/4	64	64

Ring Sizing Tool

Alternatively, you can print our ring sizing tool with labelled UK ring sizes and a tool for measuring the size of an existing ring. Or contact us to arrange in person measurement.