Ring Size Guide
Finding the perfect ring size is essential for comfort, security, and everyday wear. This guide helps you accurately measure ring size at home and compare UK, US, and EU sizes side-by-side so you never have to guess again!
Ring Size Conversion Chart (UK, US & EU)
Use the table below to compare international ring sizes.
| UK Size | US Size |
EU Size |
Diameter (mm) |
Circumference (mm) |
| A | 1 | 41 | 13.7 | 43.1 |
| C | 2 | 43 | 14.3 | 44.9 |
| E | 3 | 45 | 14.9 | 46.7 |
| F | 3.5 | 46 | 15.2 | 47.7 |
| G | 4 | 47 | 15.5 | 48.6 |
| H | 4.5 | 48 | 15.9 | 49.5 |
| I | 4.75 | 49 | 16.2 | 50.4 |
| J | 5.25 | 50 | 16.5 | 51.4 |
| K | 5.5 | 51 | 16.8 | 52.3 |
| L | 6 | 52 | 17.2 | 53.2 |
| M | 6.5 | 53 | 17.5 | 54.1 |
| N | 7 | 54 | 17.8 | 55.1 |
| O | 7.5 | 55 | 18.1 | 56.0 |
| P | 8 | 56 | 18.5 | 56.9 |
| Q | 8.5 | 57 | 18.8 | 57.8 |
| R | 9 | 58 | 19.1 | 58.7 |
| S | 9.5 | 59 | 19.4 | 59.7 |
| T | 10 | 60 | 19.7 | 60.6 |
(Tip: Most UK women fall between H–N, and men between N–T)
Tips for Getting the Perfect Ring Fit
Here are some expert tips to ensure your ring fits comfortably:
- Measure your finger at the end of the day (fingers are slightly larger)
- Avoid measuring when your hands are cold or swollen
- Always consider the width of the band (wider rings feel tighter)
- Your ring should slide over your knuckle with slight resistance
- If between sizes, choose the larger size for comfort
- Re-check size in both hands - they are often slightly different
How to Find Someone Else’s Ring Size (Gift Guide)
Buying a ring as a surprise? Here are safe, subtle ways to find their size:
Borrow a ring they already wear:
- Choose a ring worn on the correct finger
- Measure the inner diameter in mm
- Compare it to a size chart
Ask friends or family:
- Friends often already know their approximate size
- Especially useful for engagement rings
“Try-on” method:
- Try slipping a ring onto your own finger and marking how far it fits (useful but less accurate)
Paper or string method (backup option):
- Wrap string/paper around finger
- Mark overlap point and measure length in mm
Best tip:
If unsure, go slightly larger - rings can usually be resized down more easily than up.
Average Ring Sizes in the UK
These are general averages used in jewellery sizing (not exact rules):
Women (UK)
- Average: UK size L–N
- Most common range: H–N
- Typical US equivalent: 5.5 – 7
Men (UK)
- Average: UK size R–T
- Most common range: N–V
- Typical US equivalent: 8 – 10
Kids (UK)
- Small children: A–D
- Older children: D–F
- Teenagers: F–H
(Note: finger size varies significantly by height, genetics, and age)
Frequently Asked Questions
What is the most common ring size in the UK?
For women it is usually L–N, and for men R–T.
Is US ring size the same as UK?
No. UK uses alphabet sizes, while US uses numbers. EU uses millimetres.
Can rings be resized?
Yes, most rings can be resized up or down by 1–2 sizes (depending on design).
What if I’m between two sizes?
Always choose the larger size for comfort and swelling room.
Do fingers change size during the day?
Yes - heat, cold, exercise, and hydration all affect finger size.
What is the most accurate way to measure ring size?
Visiting a jeweller or using a metal ring sizer tool is the most accurate method.
Do wider rings fit differently?
Yes - wider bands usually feel tighter, so you may need to size up slightly.
