US to EU ring size converter
The European system is the easiest to understand: under ISO 8653, the EU size number IS the ring’s inner circumference in millimetres. So an EU 54 ring measures 54 mm around the inside. A US 7 works out to about EU 54. Convert your size below.
Quick answer
A US 7 is 54 in EU (about 54.4 mm inner circumference). Use the converter for your exact size, or the chart below for the full range.
Between two sizes? Size up for a comfortable fit, see how to measure accurately.
US → EU at a glance
- 4 = 47
- 5 = 49
- 6 = 52
- 7 = 54
- 8 = 57
- 9 = 59
- 10 = 62
- 11 = 65
US to EU ring size chart
| USUS / Canada | EUEU / ISO | mmCircumference | mmDiameter |
|---|---|---|---|
| 4 | 47 | 46.7 | 14.9 |
| 4½ | 48 | 48.0 | 15.3 |
| 5 | 49 | 49.3 | 15.7 |
| 5½ | 51 | 50.5 | 16.1 |
| 6 | 52 | 51.8 | 16.5 |
| 6½ | 53 | 53.1 | 16.9 |
| 7 | 54 | 54.4 | 17.3 |
| 7½ | 56 | 55.6 | 17.7 |
| 8 | 57 | 56.9 | 18.1 |
| 8½ | 58 | 58.2 | 18.5 |
| 9 | 59 | 59.5 | 18.9 |
| 9½ | 61 | 60.7 | 19.3 |
| 10 | 62 | 62.0 | 19.7 |
| 10½ | 63 | 63.3 | 20.1 |
| 11 | 65 | 64.6 | 20.5 |
| 11½ | 66 | 65.8 | 21.0 |
| 12 | 67 | 67.1 | 21.4 |
Common questions
How do I convert a US ring size to EU?
Enter your US size in the converter above and read the EU result, or find your row in the chart below. Every value is calculated from the ring’s inner circumference, so it works in both directions.
What is a US 7 in EU?
A US 7 is 54 in EU. That ring has an inner circumference of about 54.4 mm.
Related conversions
Or see the full ring size chart.