Shoe Size Converter
Convert adult shoe sizes between US, UK, EU, Japan and foot length, using the international ISO sizing formulas.
About the Shoe Size Converter
Each country numbers shoes differently. UK and US sizes step by a third of an inch (a barleycorn), EU sizes by two-thirds of a centimetre (a Paris point), and Japan and the Mondopoint system simply use foot length.
This converter goes through your foot length using the formulas in ISO/TS 19407, so every result is consistent. Brands' own charts can differ by half a size or more, so check the maker's chart when you can.
The formula
EU = 0.15 × L + 2; UK = 0.1181 × L − 23
- L
- foot length in millimetres
- US men's
- UK + 1
- US women's
- UK + 2
- Japan
- foot length in cm
Formulas from ISO/TS 19407 for adults. Children's sizes use different starting points.
Adult shoe sizes by foot length
| Foot (cm) | UK | US men | US women | EU |
|---|---|---|---|---|
| 23 | 4 | 5 | 6 | 36.5 |
| 24 | 5.5 | 6.5 | 7.5 | 38 |
| 25 | 6.5 | 7.5 | 8.5 | 39.5 |
| 26 | 7.5 | 8.5 | 9.5 | 41 |
| 27 | 9 | 10 | 11 | 42.5 |
| 28 | 10 | 11 | 12 | 44 |
| 29 | 11.5 | 12.5 | 13.5 | 45.5 |
| 30 | 12.5 | 13.5 | 14.5 | 47 |
How to read your result
- Sizes are rounded to the nearest half size.
- If you're between sizes, go up half a size.
Worked example
Example: Foot length = 27.1 cm
- Inputs: I know my: US men's size; Value: 10.
- Formula: EU = 0.15 × L + 2; UK = 0.1181 × L − 23
- Result: Foot length = 27.1 cm
Questions people ask
Is UK size the same as Indian size?
Yes. India uses the UK system for adult shoes.
Why do my sizes vary between brands?
Brands use their own lasts and allowances. The standards set the numbering, not the fit.