Wrap a piece of string or paper around the finger, mark where it overlaps, then measure that length. If you enter the diameter, circumference is computed automatically.
Recommended ring size
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International ring size chart
Circumference (mm) is the universal starting point for ring sizing.
| Circumference mm | Diameter mm | US/Canada | UK/AU | EU |
|---|---|---|---|---|
| 46.7 | 14.9 | 4 | H | 48 |
| 49.3 | 15.7 | 5.5 | J½ | 50 |
| 51.9 | 16.5 | 7 | L½ | 53 |
| 54.5 | 17.3 | 8.5 | O | 56 |
| 57.1 | 18.2 | 10 | Q½ | 58 |
| 59.7 | 19.0 | 11.5 | S½ | 61 |
| 62.3 | 19.8 | 13 | U½ | 64 |
Pro sizing tips
Ring sizing is part science, part timing — keep these in mind:
- • Measure at the end of the day — fingers swell through the day, so measure when warm.
- • Wider bands — rings wider than 6mm feel tighter; go up half a size.
- • Knuckle test — the ring should slide over the knuckle with a little effort, then fit snugly.
- • Avoid cold hands — cold shrinks your fingers and gives an undersized result.
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Dress Size Calculator