Ring Size Guide
UK, US, EU & China
How to measure your finger at home, convert between global sizing systems, and find your perfect fit — whether you're buying for yourself or gifting.
Choosing the right ring size shouldn't be guesswork. Whether you're stacking midi rings, buying a gift, or ordering internationally from JewelHub, getting the fit right the first time saves hassle — and returns.
Ring sizes vary not just between people, but between countries, ring styles, and even time of day. A UK size M is not the same as a US size M. A wide band needs a different size than a slim one. And your fingers in the morning are not the same as your fingers in the evening.
This guide covers everything you need: how to measure at home with no specialist tools, how to read and convert between UK, US, EU and Chinese sizing systems, and which sizes are most commonly ordered in the UK — so you can order with confidence.
How to Measure Your Ring Size at Home
You don't need a jeweller to find your size. Both methods below are accurate if done carefully. Measure the finger you plan to wear the ring on — your ring finger may be a different size to your other fingers, and your dominant hand is typically half a size larger.
String or Paper Strip
- Cut a thin strip of non-stretchy paper
- Wrap it snugly around the base of your finger
- Mark where the paper overlaps
- Measure the marked length in millimetres
- Match to the circumference column in the chart below
Measure an Existing Ring
- Find a ring that fits the correct finger well
- Place it flat on a ruler
- Measure the inner diameter in millimetres (not the outer edge)
- Match to the diameter column in the chart below
Time your measurement right
Fingers swell in warm weather and shrink when cold. Measure in the evening when your hands are at their natural size — not first thing in the morning or after exposure to cold. If you're between two sizes, go up, not down.
Understanding Ring Size Systems
Every country measures rings differently. The UK uses an alphabetical scale (A–Z+), the US uses numbers, Europe uses millimetre circumference, and China/Korea/Japan also use a numeric millimetre system. All are based on the internal measurement of the ring.
United Kingdom
Alphabetical scale, A to Z+5. Half-sizes exist (e.g. K½). Most common women's size: M. Most common men's size: T.
United States
Numeric scale, 1–15. Quarter and half sizes available. Average women's size: 6–7. Average men's size: 9–10.
Europe
Based on inner circumference in millimetres. Range typically EU 44–76. Directly corresponds to the mm circumference measurement.
China / Korea / Japan
Numeric scale based on inner circumference in mm. Size 15 ≈ 55mm ≈ UK O ≈ US 7.5. Sizes increase roughly 0.3mm per step.
Which Ring Sizes Are Most Popular in the UK?
Based on reported sales data from UK jewellers, size M is the single most ordered ring size for women. The range K–N covers the majority of women's ring purchases. For men, size T is dominant, with R–U covering most orders.
Buying as a gift and don't know the size? Size M is your safest starting point for women, size T for men. Rings are easier to size down than up — so if unsure, go one size larger. All JewelHub rings can be exchanged for a different size within 30 days.
Ring Size Conversion Chart — UK, US, EU, China
Highlighted rows mark the most commonly ordered sizes for women in the UK. All measurements use the inner circumference and diameter of the ring band.
| UK | US | EU | CN/KR/JP | ⌀ mm (Diameter) | C mm (Circumference) |
|---|---|---|---|---|---|
| D | 1.5 | 41 | 41 | 13.1 | 41 |
| E | 2.5 | 43 | 43 | 13.7 | 43 |
| F | 3 | 44 | 44 | 14.0 | 44 |
| G | 3.5 | 45 | 45 | 14.3 | 45 |
| H | 4 | 46 | 46 | 14.6 | 46 |
| I | 4.5 | 47 | 47 | 14.9 | 47 |
| J | 5 | 48 | 48 | 15.3 | 48 |
| K common | 5.5 | 49 | 49 | 15.6 | 49 |
| L | 6 | 51 | 51 | 16.0 | 51 |
| M most popular ★ | 6.5 | 52 | 52 | 16.4 | 52 |
| N common | 7 | 54 | 54 | 17.0 | 54 |
| O | 7.5 | 55 | 55 | 17.2 | 55 |
| P | 8 | 56 | 56 | 17.8 | 56 |
| Q | 8.5 | 58 | 58 | 18.1 | 58 |
| R | 9 | 59 | 59 | 18.5 | 59 |
| S men common | 9.5 | 60 | 60 | 19.1 | 60 |
| T men popular ★ | 10 | 61 | 61 | 19.4 | 61 |
| U | 10.5 | 63 | 63 | 19.8 | 63 |
| V | 11 | 64 | 64 | 20.4 | 64 |
| W | 11.5 | 65 | 65 | 20.7 | 65 |
| X | 12 | 67 | 67 | 21.3 | 67 |
| Y | 12.5 | 68 | 68 | 21.6 | 68 |
| Z | 13 | 69 | 69 | 22.2 | 69 |
| Z+1 | 13.5 | 71 | 71 | 22.5 | 71 |
| Z+2 | 14 | 72 | 72 | 22.9 | 72 |
| Z+3 | 14.5 | 73 | 73 | 23.2 | 73 |
Things That Affect Your Ring Size
Temperature
Fingers swell in heat and shrink in cold. Avoid measuring after exercise, a hot shower, or in cold weather.
Time of day
Fingers are at their largest in the evening due to natural swelling throughout the day. Measure then for the most accurate fit.
Ring width
Wider bands (6mm+) fit more snugly than slim bands. If choosing a wide ring, go half a size up from your usual measurement.
Dominant hand
Your dominant hand is typically half a size larger. If buying for the right hand, measure that hand specifically.
Knuckle size
If your knuckle is larger than the base of your finger, size for the knuckle so it slides on — the ring will sit loosely but securely.
Buying as a gift
When guessing, choose larger — resizing down is easier and cheaper than resizing up. UK M for women, T for men is the safest default.
Ready to find your ring?
Browse JewelHub's full ring collection — from 925 silver and 14k gold to zinc alloy and stainless steel, available in UK sizes D to Z+3.
Still unsure about your size?
Most customers pick UK M for women and UK T for men.
Choosing a gift?
If you’re between sizes, go one size up.
Rings should feel comfortable, not tight — especially in warmer weather. Ready to find your perfect fit? Explore our full collection and choose the piece that feels made for you. Every ring comes with a 30‑day exchange guarantee, so you can shop confidently.
