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Ring Size Guide
For nearly half a century, we've been honoured to celebrate life's special moments with you, offering you beautiful engagement rings and diamond rings at incredible prices.
The following guide makes it easy to measure your ring size at home, with charts and helpful tips for the perfect fit.
Visiting one of our 200+ Shops Nationwide is the most accurate way to find your ring size, or if you'd rather measure at home and order online, read on for helpful tips and guides are here to assist you.
Ring Size Measurement Chart
Circumference (mm)
| UK | Circumference (mm) | UK | Circumference (mm) | UK | Circumference (mm) |
|---|---|---|---|---|---|
| A | 37.8 | B | 39.1 | C | 40.4 |
| D | 41.7 | E | 42.9 | F | 44.2 |
| G | 45.5 | H | 46.8 | I | 48.0 |
| J | 48.7 | K | 50.0 | L | 51.2 |
| M | 52.5 | N | 53.8 | O | 55.1 |
| P | 56.3 | Q | 57.6 | R | 58.9 |
| S | 60.2 | T | 61.4 | U | 62.7 |
| V | 64.0 | W | 65.3 | X | 66.6 |
| Y | 67.8 | Z | 68.5 |
| UK / Circumference (mm) | |||
|---|---|---|---|
| A | 37.8 | B | 39.1 |
| C | 40.4 | D | 41.7 |
| E | 42.9 | F | 44.2 |
| G | 45.5 | H | 46.8 |
| I | 48.0 | J | 48.7 |
| K | 50.0 | L | 51.2 |
| M | 52.5 | N | 53.8 |
| O | 55.1 | P | 56.3 |
| Q | 57.6 | R | 58.9 |
| S | 60.2 | T | 61.4 |
| U | 62.7 | V | 64.0 |
| W | 65.3 | X | 66.6 |
| Y | 67.8 | Z | 68.5 |
Diameter (mm)
| UK | Diameter (mm) | UK | Diameter (mm) | UK | Diameter (mm) |
|---|---|---|---|---|---|
| A | 12.0 | B | 12.4 | C | 12.9 |
| D | 13.3 | E | 13.7 | F | 14.1 |
| G | 14.5 | H | 14.9 | I | 15.3 |
| J | 15.5 | K | 15.9 | L | 16.3 |
| M | 16.7 | N | 17.1 | O | 17.5 |
| P | 17.9 | Q | 18.3 | R | 18.7 |
| S | 19.2 | T | 19.5 | U | 20.0 |
| V | 20.4 | W | 20.8 | X | 21.2 |
| Y | 21.6 | Z | 21.8 |
| UK / Diameter (mm) | |||
|---|---|---|---|
| A | 12.0 | B | 12.4 |
| C | 12.9 | D | 13.3 |
| E | 13.7 | F | 14.1 |
| G | 14.5 | H | 14.9 |
| I | 15.3 | J | 15.5 |
| K | 15.9 | L | 16.3 |
| M | 16.7 | N | 17.1 |
| O | 17.5 | P | 17.9 |
| Q | 18.3 | R | 18.7 |
| S | 19.2 | T | 19.5 |
| U | 20.0 | V | 20.4 |
| W | 20.8 | X | 21.2 |
| Y | 21.6 | Z | 21.8 |
UK to EU Conversion
| UK | EU | UK | EU | UK | EU |
|---|---|---|---|---|---|
| J | 49 | K | 50 | L | 51 |
| M | 52 | N | 54 | O | 55 |
| P | 56 | Q | 57 | R | 59 |
| S | 60 | T | 61 | U | 62 |
| V | 63 | W | 65 | X | 66 |
| Y | 67 | Z | 68 |
| UK / EU | |||
|---|---|---|---|
| J | 49 | K | 50 |
| L | 51 | M | 52 |
| N | 54 | O | 55 |
| P | 56 | Q | 57 |
| R | 59 | S | 60 |
| T | 61 | U | 62 |
| V | 63 | W | 65 |
| X | 66 | Y | 67 |
| Z | 68 | ||
UK to US Conversion
| UK | US | UK | US | UK | US |
|---|---|---|---|---|---|
| J | 4 | K | 5 | L | 5 |
| M | 6 | N | 6 | O | 7 |
| P | 7 | Q | 8 | R | 8 |
| S | 9 | T | 9 | U | 10 |
| V | 10 | W | 11 | X | 11 |
| Y | 12 | Z | 12 |
| UK / US | |||
|---|---|---|---|
| J | 4 | K | 5 |
| L | 5 | M | 6 |
| N | 6 | O | 7 |
| P | 7 | Q | 8 |
| R | 8 | S | 9 |
| T | 9 | U | 10 |
| V | 10 | W | 11 |
| X | 11 | Y | 12 |
| Z | 12 | ||
Measure Your Ring by Circumference
Using a tape measure, determine your ring size in millimetres by measuring the circumference of the third finger on your left hand, or an existing ring.
Then, refer to our UK (or preferred region) ring size chart by Circumference above to find the corresponding letter size.
Measure Your Ring by Diameter
Alternatively, you can measure the internal diameter of a ring that already fits you well by placing it on a ruler and measuring straight across the centre from one inside edge to the other in millimetres.
Then, refer to our UK (or preferred region) ring size chart by Diameter above to find the corresponding letter size.
(print out using a desktop computer for best results)
We've created a handy A4 printable ring sizer (actual size) to help you find the perfect fit - just follow these simple steps:
Use a ring that already fits well and place it over the circles on the guide. Match the circle to the very inside edge of the ring - not the outside.
This guide is designed to help you find the correct ring size by measuring a ring you or your partner already own.
Simply print this page on to A4 paper, making sure that NO scaling options such as fit to page or printable area are applied, so the measurements remain as
accurate as possible.
Please note: Measurements are approximate. This guide provides an estimate and may not take the style or shape of the ring into account.
> Download our A4 printable Ring-Sizer
Handy Tips for 'at-home' Sizing
- Measure at room temperature - fingers can swell in heat and shrink in cold, so aim for a comfortable middle ground.
- Take your measurement at least three times to make sure you get an accurate size.
- Use a ring sizer if possible - printable guides are handy, but a proper ring sizer gives the most accurate result.
- Wider band rings tend to feel snugger, so you may want to choose a slightly larger size.
Don't give anything away...shhhh!
Want to know how to measure a UK ring size without giving anything away? These helpful tips will be your go-to guide!
Here's how to find their ring size discreetly and make it the most unforgettable surprise of their life.
Try it on to check the fit
Borrow one of their rings and gently slip it onto your own ring finger. Make a small mark with a pen where the ring sits comfortably on your finger, then bring that along to one of our friendly in-store experts for help finding the perfect size.
Ask someone close
Don't be afraid to call in the inner circle. Your partner's family or best friends might already know their ring size, and who knows, they may have been secretly hoping you'd ask this very question.
Get a little crafty!
Why not try a fun little trick with some plasticine or playing dough? Gently press one of your loved one's rings into the dough to create an impression, then bring it into one of our 200+ shops nationwide. One of our friendly staff members can help check the size for you.
Pop into your nearest WJ
If you're confident your loved one won't notice a ring missing for the day, simply pop into your nearest Warren James shop where one of our team can check the size for you. You can then return it safely before they're any the wiser.
Shop White Gold Rings
Discover exquisite white gold engagement rings and diamond rings that combine contemporary elegance with timeless appeal. Our white gold collection offers sleek, modern designs perfect for those seeking sophisticated style and enduring luxury.
Shop Yellow Gold Rings
Embrace warmth and classic charm with our stunning yellow gold engagement rings and diamond rings. Our yellow gold collection celebrates traditional craftsmanship with timeless designs that make the perfect choice for every occasion and generation.
Shop Platinum Rings
Experience the ultimate in luxury with our premium platinum engagement rings and lab-grown diamond rings. Platinum offers exceptional durability, rarity, and beauty—the perfect precious metal for rings designed to last a lifetime.
Shop Oval Rings
Make a distinctive statement with our elegant oval cut diamond rings and engagement rings. The oval cut offers sophisticated style and distinctive character, combining elongated elegance with brilliant sparkle for rings that truly stand out.
Ring sizing FAQs
How to work out your ring size?
To measure your own ring size, pop into your local Warren James store where we'll be happy to measure your finger, a specific ring or use the handy guide above.
Are ring sizes different for men and women?
Ring sizes are the same for both men and women. While average ring sizes may differ between them, the sizing itself is identical. For example, a size P in a ladies ring is exactly the same as a size P in a men's ring.
What’s the average ring sizes for men and women?
For ring sizes in the UK, the average ring size for women is an O and the average ring size for men is a T. It's good to keep in mind that everyone's different and one size doesn't fit all, so make sure to use our handy chart or visit your nearest Warren James for an accurate size.
What if I buy the wrong ring size?
As long as the ring is unworn, we will exchange it for the right size if you return within 30 days of purchase. After 30 days of purchase, a charge will apply for resizing your ring. Please keep in mind there are certain types of rings that we are unable to re-size. Depending on the metal and style of the ring, for example whether it has a design or stones set around the band, it may be possible for us to adjust it. Pop into your nearest Warren James store or contact our services team for more advice on resizing.
Can you make a ring bigger?
Often - yes - but this depends on the style of the ring. The best thing to do is bring your new ring into your nearest Warren James store and one of our friendly staff members will give you the help and advice you need.
Is my ring is the right fit?
You want your ring to be comfortable and secure. It should slide comfortably onto your finger with a slight resistance as it goes over your knuckle. The perfect fit means your ring stays exactly where it should, without making a bid for freedom. Your ring should stay put throughout the day, yet slip off easily for swimming or baking - ideally without soap, stress, or negotiations!