EU ring size 65 in US, UK & Japan
EU/ISO 65 denotes a nominal inner circumference of 65 mm. The nearest row in our chart is US 11, UK V½ and Japan 23: its calculated circumference is 64.6 mm and diameter is 20.57 mm. These are approximate chart equivalents, not identical dimensions.
- EU / ISO
- 65
- US / Canada
- 11
- UK / AU
- V½
- Japan
- 23
- CH / IT / ES
- 25
- Diameter
- 20.57 mm
- Circumference
- 64.6 mm
Under ISO 8653, the EU (and ISO) ring size number is the ring's inner circumference in millimetres. So EU 65 means the band measures about 65 mm all the way around — a circumference, not a diameter. That's why EU numbers are so much larger than US numbers for the same finger, and why an EU size can be read straight off a millimetre measurement.
Convert the other way with the EU to US ring size chart, open the US size 11 page, see the full chart, or use the converter.
Frequently asked questions
Why does EU 65 use a circumference number?
EU/ISO 65 follows the published circumference convention: about 65 mm around the inside (64.6 mm in this chart), corresponding to a 20.57 mm inner diameter.
How should I confirm EU 65 before ordering?
Check the retailer's own chart and confirm the 20.57 mm inner diameter with a physical sizer or a ring that already fits. Converted labels are a starting point, not a fit guarantee.
Values computed from the US jewellers’ diameter scale and cross-checked against ISO 8653 — methodology last reviewed 2026-08-27. Methodology