Measure when warm
Fingers shrink in the cold and swell in the heat. Measure at room temperature, later in the day.
Ring size guide
Ring Size Guide
A ring that fits well is one you forget you are wearing. Use our UK ring size chart and simple measuring methods to find your size at home — or visit us in Hatton Garden and we’ll measure you properly.
Fit
Why the right size matters
Even half a size makes a difference you’ll feel every day. Too tight and the ring is uncomfortable; too loose and it spins, slips or catches. Fingers also change through the day and with the seasons, so a careful measurement is worth a few minutes before your ring is made.
Method 1
Measure your finger at home
You’ll need a strip of paper or non-stretchy string, a pen and a ruler with millimetres.
- Wrap the paper or string around the base of the finger the ring will be worn on.
- Make sure it’s snug but can still slide over the knuckle.
- Mark where the end overlaps, then measure the length in millimetres.
- Enter that number in the size finder below, or find the closest circumference in the chart.
TipMeasure two or three times, at the end of the day when fingers are slightly larger.
Method 2
Measure a ring that already fits
If you already have a ring that fits the same finger, measure the inside diameter — straight across the inside edge, from one side to the other — in millimetres. Then match it to the diameter column in the chart.
TipUse a ring worn on the same finger and hand; sizes often differ between hands.
Method 3
Get sized in person
The most accurate way is to be measured with professional ring sizers. It only takes a few minutes in our Hatton Garden showroom, and we can also check how different band widths feel on your finger.
[CLIENT TO CONFIRM: do you send ring sizers by post? If yes, add: “Can’t visit? Ask us for a ring sizer by post.”]
Find your size
Enter your finger circumference or the inside diameter of a ring that fits.
Your nearest size
- UK size
- US size
- EU size
Between sizes? Choose the larger — especially for wider bands.
UK ring size chart
Find your circumference or diameter, then read across. US sizes are approximate, and EU sizes match the circumference in millimetres. Sizes can vary slightly between jewellers, so we’ll always confirm before your ring is made.
| UK size | US size (approx.) | Diameter (mm) | Circumference (mm) | EU size |
|---|---|---|---|---|
| H | 3¾ | 14.8 | 46.5 | 46.5 |
| I | 4¼ | 15.2 | 47.8 | 48 |
| J | 4¾ | 15.6 | 49.0 | 49 |
| K | 5¼ | 16.0 | 50.3 | 50 |
| L | 5¾ | 16.4 | 51.5 | 51.5 |
| M | 6¼ | 16.8 | 52.8 | 53 |
| N | 6¾ | 17.2 | 54.0 | 54 |
| O | 7¼ | 17.6 | 55.3 | 55 |
| P | 7¾ | 18.0 | 56.6 | 56.5 |
| Q | 8¼ | 18.4 | 57.8 | 58 |
| R | 8¾ | 18.8 | 59.1 | 59 |
| S | 9¼ | 19.2 | 60.3 | 60 |
| T | 9¾ | 19.6 | 61.6 | 61.5 |
| U | 10¼ | 20.0 | 62.8 | 63 |
| V | 10¾ | 20.4 | 64.1 | 64 |
| W | 11¼ | 20.8 | 65.3 | 65 |
| X | 11¾ | 21.2 | 66.6 | 66.5 |
| Y | 12¼ | 21.6 | 67.9 | 68 |
| Z | 12¾ | 22.0 | 69.1 | 69 |
Getting it right
Tips for an accurate measurement
Mind the knuckle
If your knuckle is larger than the base of your finger, choose a size that slides over it comfortably.
Wider bands fit tighter
A band wider than about 6mm can feel snug, so you may need half a size up.
Measure more than once
Take two or three readings on different days and use the most consistent one.
Use the right finger
Engagement rings are usually worn on the fourth finger of the left hand in the UK; measure that finger.
Avoid stretchy materials
String or paper that stretches will give a size that’s too large.
Planning a surprise?
How to find their size without asking
- Borrow a ring they wear on the same finger (briefly!) and bring it to us, or measure its inside diameter.
- Press the ring into a bar of soap or draw around the inside of it on paper.
- Ask a close friend or family member who may know their size.
- If in doubt, choose a slightly larger size — it’s easier to size a ring down than up.
Resizing[CLIENT TO CONFIRM resizing policy, e.g. “Most Primo rings can be resized after the proposal” / any free resize offer.]
Collection
Find the ring, then the fit
Questions
Frequently asked questions
What is the average ring size in the UK?
Common women’s sizes fall roughly between J and P, and men’s between P and V, but there is no “standard” size — always measure.
Should my ring be tight or loose?
It should slide over your knuckle with a little resistance and sit comfortably at the base of the finger without spinning.
What if I’m between sizes?
Choose the larger size, particularly for wider bands or if your knuckles are larger than the base of your finger.
Can a ring be resized later?
Most rings can be resized, but some designs (such as full eternity bands or tension settings) are difficult or impossible to resize. Ask us before ordering.
Do engagement and wedding rings need to be the same size?
Usually yes, as they’re worn on the same finger. A wide wedding band may need to be slightly larger.
Can I get sized for free in your showroom?
[CLIENT TO CONFIRM]
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