I have been buying shoes for something like five decades now, and I still cannot tell you my size with a straight face. In one brand I am a 9, in another a 9.5, and the pair I ordered from a European site last year arrived labeled 42 and fit like neither.
Somewhere along the way I stopped blaming my feet and started blaming the systems, and it turns out the systems deserve it.
Three traditions, three logics
The UK system is based on the barleycorn, an old unit of about a third of an inch. Sizes step up one barleycorn at a time, starting near a child’s foot size, which is why adult sizes are smallish numbers. The US borrowed the same barleycorn step but shifted the starting point, so US sizes run roughly one number higher than UK sizes for the same foot.
Continental Europe uses Paris points, where each step is two-thirds of a centimeter. The scale starts at zero length, so EU numbers come out much larger, typically 35 to 47 for adults.
Japan took the route I wish everyone had taken: the size is simply the foot length in centimeters. A 26.5 means a 26.5 cm foot. When I first ran across that on a trip, I remember thinking, well, that settles it, why does anyone do it any other way.
Why the conversion charts never quite agree
Compare three shoe-size charts from different retailers and they will often differ by half a size. The systems just do not line up cleanly:
- A barleycorn step is about 0.85 cm; an EU step is about 0.67 cm, so the scales drift apart as sizes climb
- Some charts measure the foot, others measure the last — the foot-shaped form the shoe is built around, which includes extra room
- Brands layer their own opinions on top: sporty labels tend to cut narrow and small, comfort labels run generous
That last point is why two pairs marked with identical sizes can fit differently even within one country. Anyone who has walked out of a shoe store empty-handed after trying four “correct” sizes knows this in their bones.
Measure the foot, not the number
The habit that finally fixed my online ordering was ignoring size numbers and measuring my feet in centimeters. Stand on a sheet of paper in the afternoon, when feet are slightly larger, mark heel and longest toe, and measure the distance. Do both feet and use the longer one — most of us have a bigger side.
With a centimeter figure in hand, every conversion chart becomes a rough guide instead of a gamble, and Japanese-style sizing becomes trivially easy to use.
Before your next international shoe order, spend two minutes with a ruler, because a centimeter measurement travels perfectly while size numbers never do.
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