Ring Size Converter
Convert between US, UK, EU ring sizes and inner diameter in millimeters.
Ring Size Chart
| US | UK | EU | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|
| 4 | H | 46.5 | 14.9 | 46.8 |
| 5 | J | 49 | 15.7 | 49.3 |
| 6 | L | 51.5 | 16.5 | 51.8 |
| 7 | N | 54 | 17.3 | 54.4 |
| 8 | P | 57 | 18.1 | 56.9 |
| 9 | R | 59 | 19.0 | 59.5 |
| 10 | T | 62 | 19.8 | 62.1 |
| 11 | V | 64.5 | 20.6 | 64.6 |
| 12 | X | 67 | 21.4 | 67.2 |
| 13 | Z | 69.5 | 22.2 | 69.7 |
How to Measure Your Ring Size
Method 1: Measure an Existing Ring
- Find a ring that fits the intended finger well
- Measure the inner diameter in millimeters
- Use the converter above to find your size
Method 2: String or Paper Method
- Wrap a string or strip of paper around your finger
- Mark where it overlaps
- Measure the length (circumference) in mm
- Divide by 3.14159 (Ď) to get diameter
Tips:
- Measure at the end of the day when fingers are largest
- Measure several times for accuracy
- Consider the ring width - wider bands need larger sizes
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