How To Measure Your Ring Size
Ring Size Guide
Use the steps below to find your perfect fit. We size in US whole sizes (5–13). The chart converts to AU/UK letters, EU, and exact millimetre measurements.
How to measure
Option 1 — Measure a ring you own
- Choose a ring that fits the right finger.
- Measure the inside diameter in millimetres (edge to edge).
- Match the diameter to the size in the chart.
Option 2 — Measure your finger
- Cut a thin paper strip (about 5 mm wide).
- Wrap it snugly around the base of your finger and mark the overlap.
- Measure the length in millimetres — that’s your inside circumference.
- Use the chart to convert to a ring size.
Pro tips:
- Measure at the end of the day when fingers are warm.
- If you have larger knuckles, measure those too and pick a size that slides over comfortably.
- Between sizes? Choose the next size up.
- Wider bands feel tighter — go ½–1 size up.
Size conversion chart (US 5–13)
| US Size | AU/UK | Inside Diameter (mm) | Inside Circumference (mm) | EU (approx) |
|---|---|---|---|---|
| 5 | J½ | 15.7 | 49.3 | 49 |
| 6 | L½ | 16.5 | 51.9 | 52 |
| 7 | N½ | 17.3 | 54.4 | 54 |
| 8 | P½ | 18.1 | 57.0 | 57 |
| 9 | R½ | 18.9 | 59.5 | 60 |
| 10 | T½ | 19.8 | 62.1 | 62 |
| 11 | V½ | 20.6 | 64.6 | 65 |
| 12 | X | 21.4 | 67.2 | 67 |
| 13 | Z | 22.2 | 69.7 | 70 |
Note: Small manufacturing tolerances (±0.2 mm) are normal. EU sizes shown are the closest common circumference sizes.