Size converters

Discrete size chart lookups for shopping and travel: convert shoe sizes (US, EU, UK, Mondopoint cm) for men and women, clothing tops between US/EU/UK, ring sizes (US numeric, UK letter, EU mm circumference), and hat fitted sizes with head circumference. Charts vary by brand — estimates only, not a substitute for trying items on or checking the manufacturer size guide.

Sizing systems are conventions rather than measurements, which is why no conversion chart can be exact across brands. Shoe sizing is the clearest case: US and UK numbering differ by roughly half a size for men and more for women, EU sizes do not map to whole US sizes at all, and lasts vary so much between manufacturers that two pairs marked identically can fit differently. Mondopoint, which states the actual foot length in millimetres, is the most reliable figure to work from if a retailer publishes it — measure your foot late in the day, when it is at its largest. Ring sizing depends on the band width, since a wide band fits more tightly than a narrow one at the same nominal size, and finger size changes with temperature. Always check the specific brand’s own chart before ordering.