US, UK, and EU Sizing Systems
US men’s sizes run roughly 0.5 larger than UK sizes (US 9 ≈ UK 8.5). EU sizes use the “Paris point” (⅔ cm per size increment); US men’s 9 ≈ EU 42. Women’s US sizes add 1.5 to the men’s equivalent (US women’s 9 ≈ US men’s 7.5). Children’s US sizing restarts at 1 after size 13 toddler—a US kids’ 13 is smaller than a US men’s 1.
How Foot Length Translates to Size
Measure your foot length (heel to longest toe) while standing. US men’s size 9 fits a foot of approximately 26.7 cm (10.5 inches). Each full size step is about 8.5mm (roughly ⅓ inch). Always measure both feet—most people have one foot up to a half size larger. Fit to the larger foot.
Width Sizing
Standard US widths range from 4A (narrowest) through 6E (widest). D is the standard men’s width; B is the standard women’s width. European manufacturers use alphabetical widths (F, G, H) that do not map directly to US widths. Width matters most for athletic and safety footwear—a wrong width causes blistering that a correct length cannot prevent.
Frequently Asked Questions
How do I measure my foot?
Stand on paper, trace your foot outline, and measure heel-to-longest-toe in centimeters. Measure both feet and use the larger size. Foot length typically runs 1–1.5 cm shorter than a shoe’s interior length. Measure in the evening — feet expand by up to half a size during the day.
Are shoe sizes universal?
No. US, UK, and EU systems use different base measurements and increment at different rates. A US men’s 10 is roughly a UK 9 and EU 43.5, but exact fits vary by brand and last shape. Always check a brand’s specific size chart when ordering internationally, especially for athletic and work footwear.