EU to US ring size converter
A European (ISO 8653) ring size is the inner circumference in millimetres, so it converts cleanly to the US numeric scale. An EU 52 is roughly a US 6 and an EU 54 is roughly a US 7. Enter the EU number below for the exact US size.
Quick answer
A EU 54 is 7 in US (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.
EU → US at a glance
- 47 = 4
- 49 = 5
- 52 = 6
- 54 = 7
- 57 = 8
- 59 = 9
- 62 = 10
- 65 = 11
EU to US ring size chart
| EUEU / ISO | USUS / Canada | mmCircumference | mmDiameter |
|---|---|---|---|
| 47 | 4 | 46.7 | 14.9 |
| 48 | 4½ | 48.0 | 15.3 |
| 49 | 5 | 49.3 | 15.7 |
| 51 | 5½ | 50.5 | 16.1 |
| 52 | 6 | 51.8 | 16.5 |
| 53 | 6½ | 53.1 | 16.9 |
| 54 | 7 | 54.4 | 17.3 |
| 56 | 7½ | 55.6 | 17.7 |
| 57 | 8 | 56.9 | 18.1 |
| 58 | 8½ | 58.2 | 18.5 |
| 59 | 9 | 59.5 | 18.9 |
| 61 | 9½ | 60.7 | 19.3 |
| 62 | 10 | 62.0 | 19.7 |
| 63 | 10½ | 63.3 | 20.1 |
| 65 | 11 | 64.6 | 20.5 |
| 66 | 11½ | 65.8 | 21.0 |
| 67 | 12 | 67.1 | 21.4 |
You are starting with the easy end
Converting from Europe to the US is the simple direction, because you already hold a real measurement. Your EU number is the inner circumference in millimetres. All the conversion does is find which US size is closest to that circumference.
The US scale climbs in steps of 2.55 mm from its own starting point, so an EU 52 lands near a US 6 and an EU 54 lands near a US 7.
Expect to land between two US sizes
European sizes come in whole millimetres and US sizes are 2.55 mm apart, so the two grids do not line up. Across the usual adult range, roughly two European sizes in every five land far enough from a US half size that the converter flags them as being between two sizes.
This is not a flaw in the chart, it is a real gap in the American scale. When it happens, the converter tells you rather than quietly rounding. Take the larger US size unless the ring is a wide band, and remember that a US jeweller can usually adjust a plain band by a half size without difficulty.
Check the ring, not the packaging
If you are converting a size printed on a box or a receipt, be careful: European retailers sometimes list the size of the finger they measured rather than the ring they sold, and the two can differ on wide bands.
Measuring the ring itself removes the doubt. Lay it flat, measure straight across the inside in millimetres, and convert that diameter. The converter above accepts a diameter as well as a circumference, so you do not have to do the arithmetic.
Common questions
How do I convert a EU ring size to US?
Enter your EU size in the converter above and read the US 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 EU 54 in US?
A EU 54 is 7 in US. That ring has an inner circumference of about 54.4 mm.
Related conversions
Or see the full ring size chart.