FIT GUIDANCE
Ring size calculator
Measure a ring you own or your finger circumference. Your result is an estimate; always check the fit of the specific ring.
Enter a measurement to see an estimated ring size.
Ring size conversion chart
| UK | US | EU (approx.) | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|
| F | 3 | 44 | 14.07 | 44.20 |
| G | 3.5 | 45 | 14.48 | 45.48 |
| H | 4 | 47 | 14.88 | 46.75 |
| I 1/2 | 4.5 | 48 | 15.29 | 48.03 |
| J 1/2 | 5 | 49 | 15.69 | 49.30 |
| K 1/2 | 5.5 | 51 | 16.10 | 50.58 |
| L 1/2 | 6 | 52 | 16.50 | 51.85 |
| M 1/2 | 6.5 | 53 | 16.91 | 53.13 |
| N 1/2 | 7 | 54 | 17.32 | 54.40 |
| O 1/2 | 7.5 | 56 | 17.72 | 55.68 |
| P 1/2 | 8 | 57 | 18.13 | 56.95 |
| Q 1/2 | 8.5 | 58 | 18.54 | 58.23 |
| R 1/2 | 9 | 60 | 18.94 | 59.50 |
| S 1/2 | 9.5 | 61 | 19.35 | 60.78 |
| T 1/2 | 10 | 62 | 19.75 | 62.05 |
| U 1/2 | 10.5 | 63 | 20.16 | 63.33 |
| V 1/2 | 11 | 65 | 20.56 | 64.60 |
| W 1/2 | 11.5 | 66 | 20.97 | 65.88 |
| X 1/2 | 12 | 67 | 21.37 | 67.15 |
| Y 1/2 | 12.5 | 68 | 21.78 | 68.43 |
| Z 1/2 | 13 | 70 | 22.19 | 69.70 |
Printable measuring instructions
- Use a ruler with millimetre marks.
- For an existing ring, measure straight across the inside of the ring at its widest point.
- Alternatively, wrap a soft tape around the finger without squeezing, then read the circumference.
- Measure more than once and compare the result against the table.
- Print at 100% scale if using this page as a paper reference. Do not estimate from your display size.
No matching jewellery is currently in stock. Explore the guide or browse our full collection.
Browse jewellery →Conversions are approximate. Different makers use different tolerances and band widths. Ask us about a specific ring.