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UK ring size chart

British sizes run by letter. If you already know a ring that fits, measure across the inside of the band for the diameter, or wrap a strip of paper round the inside for the circumference, then read the letter from the table.

Measurements are taken inside the band
UK size Inside diameter Inside circumference
A 12.04 mm 37.8 mm
B 12.45 mm 39.1 mm
C 12.85 mm 40.4 mm
D 13.26 mm 41.7 mm
E 13.67 mm 42.9 mm
F 14.07 mm 44.2 mm
G 14.48 mm 45.5 mm
H 14.88 mm 46.8 mm
I 15.29 mm 48.0 mm
J 15.49 mm 48.7 mm
K 15.90 mm 50.0 mm
L 16.31 mm 51.2 mm
M 16.71 mm 52.5 mm
N 17.12 mm 53.8 mm
O 17.53 mm 55.1 mm
P 17.93 mm 56.3 mm
Q 18.34 mm 57.6 mm
R 18.75 mm 58.9 mm
S 19.15 mm 60.2 mm
T 19.56 mm 61.4 mm
U 19.96 mm 62.7 mm
V 20.37 mm 64.0 mm
W 20.78 mm 65.3 mm
X 21.18 mm 66.6 mm
Y 21.59 mm 67.8 mm
Z 21.79 mm 68.5 mm

Measuring at home

  1. Wrap a strip of paper snugly round the base of the finger, mark where it overlaps and measure the length in millimetres. That length is the circumference.
  2. Measure late in the day. Fingers are at their smallest first thing in the morning and in the cold.
  3. The ring has to pass the knuckle. If the knuckle is much wider than the base of the finger, size to the knuckle and we will discuss the fit.
  4. Wide bands sit tighter than narrow ones. For anything over about 6mm across, go up half a size.

If you are not sure

You do not need to be. We confirm the size with you before your ring is made, and we can post a sizing gauge or convert from a US or European size if that is what you have. Ask us on the contact page or by WhatsApp.

Sizing after it is made

For a ring we have made, sizing down is complimentary. Sizing up is quoted by the metal added. Rings made elsewhere are chargeable either way, quoted before any work begins. Some settings, full eternity bands in particular, cannot be resized and have to be remade.

Printable ring size guide sheet with lettered circles J to Z and a cut out paper finger sizer
How to take your UK ring size.


To help you find your size, we’ve made a downloadable ring sizer chart at actual size. Follow these steps.

  • Download the sizer and print it on A4 paper.
  • Cut out the sizer.
  • Wrap it around your finger.
  • Insert the end through the slot.
  • Pull it until it sits snugly on your finger.
  • Check that it will pass over your knuckle.
  • Read your size from the letter the arrow points to.


This is a guide only and does not take the style of the ring into account.

DOWNLOAD THE GUIDE TO RING SIZES

Ring size guide
Ring size conversion table matching millimetre diameters to UK letters, Europe, US and Asian sizes

Sizes in other countries

Conversions to European, US and Asian sizes.

Common questions

Can I work out the size from a ring that already fits?

Yes. Measure across the inside of the band for the diameter, or wrap a strip of paper round the inside for the circumference, then read the letter from the UK ring size chart. Every measurement in the chart is taken inside the band.

What if I am not sure of my size, or only know a US or European size?

You do not need to be sure. We confirm the size with you before your ring is made, and we can post a sizing gauge or convert from a US or European size. The most accurate way to find your size is to have your finger measured at our studio, by appointment. Ask us on the contact page or by WhatsApp.

Can a ring be resized after it is made?

For a ring we have made, sizing down is complimentary and sizing up is quoted by the metal added. Rings made elsewhere are chargeable either way, quoted before any work begins. Some settings, full eternity bands in particular, cannot be resized and have to be remade.

Visit the studio

Book a private appointment at our Hatton Garden studio, or begin by phone or WhatsApp.

Book a consultationWhatsAppCall +44 20 7206 2705

We typically reply within four working hours.