Shoe Size Converter
Pick the system you know your size in, enter it, and we give the equivalent in the others, plus your foot length.
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The formula
US men's = 3 x foot length (in) - 22. US women's = US men's + 1.5. UK = US men's - 1. EU = (foot length in cm + 1.5) x 1.5.
How the systems relate
They are all based on foot length but with different starting points and steps. US women's sizes run about 1.5 larger than US men's for the same foot, and UK sizes are about 1 smaller than US men's.
Common conversions
| US men's | US women's | UK | EU |
|---|---|---|---|
| 7 | 8.5 | 6 | 40 |
| 8 | 9.5 | 7 | 41 |
| 9 | 10.5 | 8 | 42 |
| 10 | 11.5 | 9 | 44 |
| 11 | 12.5 | 10 | 45 |
Measure your foot
Stand on a sheet of paper, mark the longest point of your heel and toe, and measure between them in centimetres. Do it late in the day, when your feet are largest. Brands vary, so check the size guide of the maker when you can.
Examples to check
Type these into the calculator above to see how it behaves. Every result below was produced by the same calculator code that runs on this page.
| What you enter | What you get |
|---|---|
| US men's; Size: 9 | US men's: 9; US women's: 10.5 |
| US women's; Size: 7 | US men's: 5.5; US women's: 7 |
| UK; Size: 6 | US men's: 7; US women's: 8.5 |
| EU; Size: 42 | US men's: 9.5; US women's: 11 |
Shoe Size Converter: frequently asked questions
Why does my size differ between brands?
Sizing is not standardised. A running shoe often runs half a size smaller or larger than a dress shoe, so use the conversion as a starting point.
How exact is the conversion?
It uses the internationally agreed definitions, and rounds only the number you see.
Is what I enter in this converter saved or sent anywhere?
No. The calculation runs in your browser, so what you enter is not sent to our servers. We only count, anonymously, whether a tool ran successfully.
Is this converter free to use?
Yes. It is free, needs no sign-up and has no usage limit.
Last reviewed: October 3, 2026