Three different countries, three completely different number systems, all describing the same lump of leather. Shoe sizing is one of the most chaotic corners of consumer measurement — but underneath the chaos there are clean formulas linking the systems. Once you see them, conversion stops being guesswork.
Men's Shoe Size Conversions
| Foot length (cm) | UK | US (men) | US (women) | EU |
|---|---|---|---|---|
| 24.1 | 6 | 7 | 8.5 | 40 |
| 24.8 | 7 | 8 | 9.5 | 41 |
| 25.4 | 7.5 | 8.5 | 10 | 41.5 |
| 26.0 | 8 | 9 | 10.5 | 42 |
| 26.7 | 9 | 10 | 11.5 | 43 |
| 27.3 | 10 | 11 | 12.5 | 44 |
The Three Systems
UK sizes count barleycorns (one-third of an inch) along the last. US sizes are essentially UK sizes shifted by a fixed offset — +1 for men, +2 for women. EU sizes use the Paris point of 2/3 cm and measure the last, not the foot, so the EU number is always larger than the foot length in centimetres. Mondopoint (the ISO system) cuts through all of that by labelling the shoe with foot length in millimetres — a 265 Mondopoint shoe fits a 265 mm foot.
Why Sizes Still Vary Within One System
Even when the label is the same, two shoes can fit very differently. The shape of the last (the wooden or plastic foot model the shoe is built around) varies between brands — Italian lasts tend to run narrow, American lasts tend to run wider, athletic brands cut to their own templates. Width letters (B, D, E, EE, EEE in US sizing) and arch height add further dimensions that a one-number label cannot capture. Treat a converted size as a starting point, not a guarantee.
Measure Your Foot Length
Switch between millimetres, centimetres, and inches in a click with UnitSnap's length converter.
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