Convert between US, UK, EU, and Asian ring sizes. Calculate from diameter or circumference measurements
Choose how you want to measure
Measure the inner diameter of your ring
Measure around your finger
Enter your known ring size
Measure inner diameter with ruler
Wrap string, mark, then measure
Measure at end of day (fingers largest)
Avoid measuring when cold/hot
Quick reference for size conversions
| US Size | UK Size | EU Size | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|
| 3 | F | 44 | 14.0 | 44.0 |
| 4 | H | 47 | 14.8 | 46.5 |
| 5 | J | 49 | 15.6 | 49.0 |
| 6 | L | 52 | 16.5 | 51.9 |
| 7 | N | 54 | 17.3 | 54.4 |
| 8 | P | 57 | 18.1 | 56.9 |
| 9 | R | 60 | 19.0 | 59.7 |
| 10 | T | 62 | 19.8 | 62.2 |
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Common questions about the Ring Size Calculator