Ring Size Converter
Convert ring sizes between US, UK and EU, with inside diameter and circumference in millimetres. US 6 is UK L and EU 52.
Your details
Result
US size
6
UK L · EU 52
- Inside diameter
- 16.51 mm
- Inside circumference
- 51.86 mm
Ring size chart
| US | UK | EU | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|
| 3 | F | 44 | 14.07 | 44.20 |
| 3.5 | G | 45 | 14.47 | 45.47 |
| 4 | H | 47 | 14.88 | 46.75 |
| 4.5 | I | 48 | 15.29 | 48.03 |
| 5 | J | 49 | 15.69 | 49.30 |
| 5.5 | K | 51 | 16.10 | 50.58 |
- Inside diameter (mm) = 11.63 + 0.8128 × US size; the EU size is the inside circumference in mm. Measure at room temperature.
Good to know: Inside diameter (mm) = 11.63 + 0.8128 × US size.
Questions people ask
What is a US size 6 in UK and EU?
UK L, EU 52, about 16.51 mm inside diameter. EU sizes are simply the inside circumference in millimetres.
How do I measure my ring size at home?
Wrap a strip of paper snugly around the finger, mark the overlap and measure the length in mm. That is the circumference, and the chart gives the matching size.
Do fingers change size during the day?
Yes. Heat, exercise and salt make fingers swell. Measure at room temperature, at the end of the day, for the most reliable size.
Related tools
How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it.
Spotted a mistake? Tell us and we'll check it. How we check our calculators