US: 10 to Europe Size 40
Cross-market men’s footwear, boots, sneakers, and loafers size conversion mapping 10 specifications into 40.

Analyzing Shoe Size Equivalence Across Markets
US: 10: Features a foot length of 28 (11 ), a recommended range of 27.6–28 (10.9–11 ), and fit type Standard Width (D).
Europe Size 40: Features a foot length of 25 (9.8 ), a recommended range of 24.6–25 (9.7–9.8 ), and fit type Standard Width (D).
Other Conversions to Europe Size 40
US: 6 → eu-406 to eu-40
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US: 6.5 → eu-406.5 to eu-40
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US: 7 → eu-407 to eu-40
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US: 7.5 → eu-407.5 to eu-40
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US: 8 → eu-408 to eu-40
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US: 8.5 → eu-408.5 to eu-40
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US: 9 → eu-409 to eu-40
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US: 9.5 → eu-409.5 to eu-40
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US: 10 → eu-4010 to eu-40
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US: 10.5 → eu-4010.5 to eu-40
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US: 11 → eu-4011 to eu-40
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US: 11.5 → eu-4011.5 to eu-40
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