Ring size guide
UK sellers list ring sizes as letters (J, N, P½), US sellers as numbers and European sellers as millimetres. Convert any of them here, then jump straight to rings in your size.
UK, US and EU ring sizes
| UK | US | EU (circumference mm) | Inside diameter | Rings in this size today |
|---|---|---|---|---|
| F | 2.75 | 44.0 | 14.0 mm | 40 |
| G | 3.25 | 45.3 | 14.4 mm | 105 |
| H | 3.75 | 46.5 | 14.8 mm | 336 |
| I | 4.25 | 47.8 | 15.2 mm | 866 |
| J | 4.75 | 49.0 | 15.6 mm | 1,917 |
| K | 5.25 | 50.3 | 16.0 mm | 3,030 |
| L | 5.75 | 51.5 | 16.4 mm | 4,563 |
| M | 6.25 | 52.8 | 16.8 mm | 5,272 |
| N | 6.75 | 54.0 | 17.2 mm | 7,321 |
| O | 7.25 | 55.3 | 17.6 mm | 4,461 |
| P | 7.75 | 56.5 | 18.0 mm | 3,778 |
| Q | 8.25 | 57.8 | 18.4 mm | 1,927 |
| R | 8.75 | 59.0 | 18.8 mm | 1,464 |
| S | 9.25 | 60.3 | 19.2 mm | 1,509 |
| T | 9.75 | 61.5 | 19.6 mm | 801 |
| U | 10.25 | 62.8 | 20.0 mm | 541 |
| V | 10.75 | 64.0 | 20.4 mm | 397 |
| W | 11.25 | 65.3 | 20.8 mm | 234 |
| X | 11.75 | 66.5 | 21.2 mm | 155 |
| Y | 12.25 | 67.8 | 21.6 mm | 122 |
| Z | 12.75 | 69.0 | 22.0 mm | 135 |
How to measure your ring size at home
- Use a ring that fits. Measure the inside diameter across the middle in millimetres and enter it above. This is the most accurate home method.
- Or use a strip of paper. Wrap it around the base of your finger, mark where it overlaps, measure the length in millimetres: that is the EU size. Fingers swell when warm, so measure at the end of the day.
- Allow for the knuckle. The ring must slide over it. If your knuckle is much wider than the base of your finger, go half a size up.
- Wide bands fit tighter. For a band wider than 6mm, go half a size up.
Vintage rings were made to every size, but most listings give the size in the title. Use the size filter on any page of this site to show rings that already fit, or allow £30 to £80 for a jeweller to resize a gold ring.
Questions buyers ask
What is the most common ring size in the UK?
For women, sizes L to N are the most common; for men, R to T. Today 7,321 rings on eBay UK list size N in the title, more than any other size.
Can a vintage ring be resized?
Most can, by one or two sizes, by a jeweller. Full eternity rings, rings with stones all the way round and very thin antique shanks are the exceptions. Resizing usually costs £30 to £80 for gold and more for platinum.
How do I convert a US ring size to UK?
Each whole US size is two UK letters: US 5 is UK J½, US 6 is UK L½, US 7 is UK N½ and US 8 is UK P½. Use the converter on this page for the exact match and the inside diameter in millimetres.