EU 21 in US and UK sizes
EU 21 is a kids’ US 5C–5.5C and UK 5 by the standard size tables: a toddler size.
It fits a foot of 12.3 to 12.7 cm.
On the brands’ own kids’ charts, EU 21 is US 5C at ASICS, Converse and 11 more; US 5.5C at adidas, Liberty and 4 more; US 4 at SOREL. Brands size their shoes on their own lasts, so check the brand you’re buying.
Convert another size
EU 21 in every size system
| System | Men’s | Women’s | Kids |
|---|---|---|---|
| Foot length (cm) | 12.3–12.7 | 12.3–12.7 | 12.3–12.7 |
| US | — | — | 5C–5.5C |
| UK | — | — | 5 |
| Mondopoint (mm) | 125–130 | 125–130 | 125–130 |
| Japan (cm) | 12.5–13 | 12.5–13 | 12.5–13 |
| India (UK sizes) | — | — | 5 |
| Australia and NZ | — | — | 5 |
| South Korea (mm) | 125–130 | 125–130 | 125–130 |
| China (mm) | 125–130 | 125–130 | 125–130 |
| Mexico (cm) | 12.5–13 | 12.5–13 | 12.5–13 |
| Brazil | 19 | 19 | 19 |
| Argentina, Uruguay, Paraguay | 20 | 20 | 20 |
From the standard size tables. A size fits a range of feet; where that range spans two sizes in another system, both are shown. A dash means the system has no size there.
What 22 brands print next to EU 21
The row each brand’s own chart prints for EU 21, linked. Brands without that exact size on a chart are left out. Not affiliated with any brand.
Size tables checked 2026-10-23; brand sizes from each brand’s own chart, linked above. An estimate to help you choose: fit varies by brand and model. Not medical advice.