US: 8 to Europe Size 55.5
Cross-market men’s wedding band and signet ring size conversion mapping 8 specifications into 55.5.

Analyzing Ring Size Equivalence Across Markets
US: 8: Features an inner finger circumference of 57 (2.24 ), and an inner diameter of 18.1 (0.713 ).
Europe Size 55.5: Features an inner finger circumference of 55.7 (2.19 ), and an inner diameter of 17.7 (0.697 ).
Other Conversions to Europe Size 55.5
US: 7 → eu-55-57 to eu-55-5
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US: 7.5 → eu-55-57.5 to eu-55-5
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US: 8 → eu-55-58 to eu-55-5
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US: 8.5 → eu-55-58.5 to eu-55-5
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US: 9 → eu-55-59 to eu-55-5
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US: 9.5 → eu-55-59.5 to eu-55-5
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US: 10 → eu-55-510 to eu-55-5
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US: 10.5 → eu-55-510.5 to eu-55-5
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US: 11 → eu-55-511 to eu-55-5
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US: 11.5 → eu-55-511.5 to eu-55-5
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US: 12 → eu-55-512 to eu-55-5
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US: 12.5 → eu-55-512.5 to eu-55-5
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