US: 6 to Europe Size 37.5
Cross-market women’s shoes, heels, boots, flats, and sneakers conversion mapping 6 specifications into 37.5.

Analyzing Footwear Size Equivalence Across Markets
US: 6: Features a foot length of 22.9 (9 ), ball width of 8.5 (3.3 ), heel height of 6 (2.4 ), and Medium Arch support optimized for women’s footwear.
Europe Size 37.5: Features a foot length of 23.5 (9.25 ), ball width of 8.8 (3.46 ), and heel height of 7.5 (3 ), and Medium-to-High Arch support optimized for women’s footwear.