Europe Size 66 to US: 9

Cross-market men’s wedding band and signet ring size conversion mapping 66 specifications into 9.

From Standard & Size
EU
Converted Equivalent
US
11.5
Based on row equivalence: US 11.5 | EU 66
Standard cross-walk matching active anthropometric row parameters.
Europe Size 66 to US: 9 Men’s Rings Conversion

Analyzing Ring Size Equivalence Across Markets

Europe Size 66: Features an inner finger circumference of 65.9 mm\text{mm} (2.59 in\text{in}), and an inner diameter of 21 mm\text{mm} (0.827 in\text{in}).

US: 9: Features an inner finger circumference of 59.5 mm\text{mm} (2.34 in\text{in}), and an inner diameter of 18.9 mm\text{mm} (0.744 in\text{in}).

Other Conversions to US: 9