Ring Size Calculator
Convert ring measurements between US, UK, and EU sizes from diameter or circumference.
US Size
6.5
UK Size
R
EU Size
53.2
Size Equivalents
| US Size | 6.5 |
| UK Size | R |
| EU Size (circumference mm) | 53.2 |
| Inside Diameter | 16.92 mm |
| Inside Circumference | 53.16 mm |
Reference Chart
| US | UK | EU | Diameter | Circ. |
|---|---|---|---|---|
| 3 | K | 44.1 | 14.05 mm | 44.14 mm |
| 4 | M | 46.7 | 14.86 mm | 46.68 mm |
| 5 | O | 49.3 | 15.70 mm | 49.32 mm |
| 6 | Q | 51.9 | 16.51 mm | 51.87 mm |
| 7 | S | 54.5 | 17.35 mm | 54.51 mm |
| 8 | U | 57.2 | 18.19 mm | 57.15 mm |
| 9 | W | 59.3 | 18.89 mm | 59.34 mm |
| 10 | Y | 62.3 | 19.84 mm | 62.33 mm |
| 11 | [ | 65.0 | 20.68 mm | 64.97 mm |
| 12 | ] | 67.5 | 21.49 mm | 67.51 mm |
| 13 | _ | 70.2 | 22.33 mm | 70.15 mm |
| 14 | a | 72.3 | 23.01 mm | 72.29 mm |
| 15 | c | 74.8 | 23.83 mm | 74.84 mm |
Use the Ring Size Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.
Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.
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