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 to AU/UK & EU conversions with mm measurements
| 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.
