Shoe Size Converter
Convert shoe sizes between US, UK, EU, and CM
Convert shoe sizes between US, UK, EU (European), and CM (centimeters) for both men and women. Whether you are shopping internationally or need your foot length in centimeters, this converter has you covered.
Most common answer: A US men’s 10 equals UK 9, EU 43.5, and 28.0 cm. A US women’s 8 equals UK 5.5, EU 39, and 24.8 cm.
| US | UK | EU | CM |
|---|---|---|---|
| 7 | 7.5 | 43.5 | 29.1 |
| 8 | 8.5 | 45 | 29.9 |
| 9 | 9.5 | 46 | 30.8 |
| 10 | 10.5 | 47.5 | 31.6 |
| 11 | 11.5 | 48.5 | 32.5 |
| 12 | 12.5 | 50 | 33.3 |
| 13 | 13.5 | 51 | 34.2 |
- Measure your feet in the afternoon when they are at their largest
- Leave about a thumb's width between your longest toe and the end of the shoe
- Width varies by brand -- some run narrow (Nike) while others run wide (New Balance)
- Sizes can differ between athletic, dress, and casual shoes from the same brand
- If between sizes, choose the larger size for comfort
Shoe Size Converter
How to Use This Converter
Select your gender, choose the sizing system you’re converting from, and enter your size. The converter instantly shows the equivalent in all four sizing systems.
How to Measure Your Foot
- Stand on a piece of paper against a wall.
- Mark the longest point of your toe and the back of your heel.
- Measure the distance in centimeters.
- Measure both feet — use the larger measurement.
- Measure in the afternoon when feet are at their largest.
Tips for Online Shoe Shopping
- Know your CM measurement — It is the most universal metric.
- Check brand-specific charts — Nike runs narrow, New Balance offers wide options, Adidas runs slightly large.
- Leave thumb-width space — About 0.5–1 cm between longest toe and shoe end.
- When between sizes, go up — Easier to add an insole than stretch a tight shoe.
Sources
- ISO 9407:2019 — Shoe sizes: Mondopoint system
- ASTM F539 — Standard Practice for Fitting Athletic Footwear
- European Committee for Standardization (CEN) — Paris Point sizing
Related Calculators
- Unit Converter — Convert between measurement systems
- Running Pace Calculator — Find your race pace
- BMI Calculator — Check body mass index
よくある質問
The conversion is not a simple formula because US and EU sizing systems are different. As approximate guidelines: US men 10 = EU 43-44. US women 8 = EU 38-39. The converter uses the Mondopoint (CM) measurement as the bridge between systems. Always check brand-specific charts since sizing varies between manufacturers.
In the US sizing system, women sizes are about 1.5 sizes higher than men sizes for the same foot length. A US men 8 is roughly equivalent to a US women 9.5. UK sizes also differ between men and women. EU sizes are unisex, meaning a EU 42 is the same foot length regardless of gender. CM (Mondopoint) measurements are also gender-neutral.
Stand on a piece of paper against a wall with your heel touching the wall. Mark the tip of your longest toe (not always the big toe). Measure from the wall to the mark in centimeters. Measure both feet and use the larger measurement. Measure in the afternoon when feet are slightly swollen. Wear the type of socks you plan to wear with the shoes.
Shoe sizes vary because there is no universal standard that all manufacturers follow. Each brand uses their own "last" (foot mold) shape and may interpret sizing charts differently. Nike tends to run narrow, New Balance offers wider options, Adidas tends to run slightly large, and Converse/Vans run large. Always try on shoes or check brand-specific charts.
Standard width is D for men and B for women. Wide is E or 2E (EE) for men, and D for women. Extra wide is 3E (EEE) or 4E (EEEE) for men, and 2E for women. Narrow is C for men and A or AA for women. Width varies by length. A size 10 D is wider in absolute terms than a size 7 D, but both are "standard" width.
Yes, most running shoe experts recommend going up half a size from your casual shoe size. Your feet swell during running, and you need about a thumb width (roughly 0.5-1 cm) between your longest toe and the end of the shoe. Shoes that are too short cause black toenails and blisters. Too loose and your foot slides, causing friction.
Yes. Feet tend to get wider and longer as you age due to the natural weakening of ligaments and tendons. The arch flattens, spreading the foot. Pregnancy can also permanently increase foot size by half a size or more. It is recommended to have your feet measured every few years, especially after age 40, and not assume your size from years ago still fits.
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