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- Know Your Ring Size
How to Measure Ring Size UK
There are several ways to check your size before you buy that perfect ring. The most accurate is to visit your nearest showroom where we can measure your finger exactly

If you are purchasing a ring as a gift and would prefer to measure ring size at home, we are more than happy to send you a free UK ring size chart. To request yours, please contact our customer experience team on freephone 0800 111 4524 during the following times:
- Monday-Friday: 9:00am - 5:00pm
- Bank holidays: 9am - 5pm
If you are calling from outside the UK, please dial +44 (0)116 2901237. Calls from outside the UK are chargeable.
Need to know your ring size in a hurry? Download our handy ring size calculator, and follow the instructions on how to carry out your measurements.
To help you match your dimensions with the corresponding ring size in mm, please use our exclusive ring size chart below:
Ring size (UK) | Measurement (mm) | Ring size (UK) | Measurement (mm) |
A | 37.8 | N | 53.8 |
B | 39.1 | O | 55.1 |
C | 40.4 | P | 56.3 |
D | 41.7 | Q | 57.6 |
E | 42.9 | R | 58.9 |
F | 44.2 | S | 60.2 |
G | 45.5 | T | 61.4 |
H | 46.8 | U | 62.7 |
I | 48.0 | V | 64.0 |
J | 48.7 | W | 65.3 |
K | 50.0 | X | 66.6 |
L | 51.2 | Y | 67.8 |
M | 52.5 | Z | 68.5 |
Does the style of ring affect my ring size?
Rings which have a deep band width should always be slightly larger than usual, so remember to consider this when checking your size.
What if my ring is too big or too small?
If you find that the ring you've bought from us is too big or small, just take it along to one of our showrooms. We'll either re-size or exchange it to ensure you always get the perfect fit.
© 2022 Mappin & Webb
Mappin & Webb is a trading name of Watches of Switzerland Company Limited. Registered Office: Aurum House, 2 Elland Road, Braunstone, Leicester, LE3 1TT, Registered in England and Wales, Company number 00146087. Registered VAT Number 834 8634 04. Watches of Switzerland Company Limited acts as a broker and not a lender and offers finance from Secured Trust Bank PLC trading as V12 Retail Finance and PayPal (Europe) S.à r.l. et Cie, S.C.A., 22-24 Boulevard Royal L-2449, Luxembourg trading as PayPal Credit. Watches of Switzerland Company Limited is authorised and regulated by the Finance Conduct Authority. Our registration number is 308710. Credit provided is subject to age and status, minimum spend applies. Terms and Conditions apply. UK residents only. We may receive a commission if your application is successful, and the amount may vary depending on the product chosen and the amount of credit taken out. Not all products are regulated by the Financial Conduct Authority and FOS protection will not be extended to unregulated agreements.