Size 12C: the kids’ shoe size explained
A size 12C fits a foot of 18.0 to 18.4 cm (7.08 to 7.25 in): UK 11.5–12 and EU 29–30 by the standard size tables, a little kid size.
The median child’s foot reaches the middle of a 12C at about 6½ years and stays in it for about 5 months, in the US Consumer Product Safety Commission’s survey of children.
Where 12C sits
After 12C: the next sizes
The next size, 12.5C, fits 4.3 mm more foot, up to 18.8 cm. Around the age a 12C is outgrown the median child’s foot grows about 0.8 mm a month, so it fills a 12.5C about 6 months later.
| Size | Foot (cm) | UK | EU | Outgrown at |
|---|---|---|---|---|
| 12C (this size) | 18.0–18.4 | 11.5–12 | 29–30 | about 6½ years |
| 12.5C | 18.4–18.8 | 12–12.5 | 30–30.5 | about 7 years |
| 13C | 18.8–19.3 | 12.5–13 | 30.5–31 | about 7½ years |
Outgrown at: when the median child’s foot reaches the top of the size, girls and boys together. Half of children get there sooner.
What 13 brands print for a 12C
On the brands’ own charts a 12C is for a foot of up to 17.5 cm (Vans) to 18.5 cm (Salomon); the standard is 18.4 cm. Check the brand’s chart before you buy.
| Brand | Prints | UK | EU | Foot up to |
|---|---|---|---|---|
| Vans size chart (opens the brand’s site) | 12C | 11.5 | 29 | 17.5 cm |
| adidas size chart (opens the brand’s site) | 12k | 11.5k | 30 | 17.8 cm |
| On size chart (opens the brand’s site) | 12K | 11.5K | 29.5 | 18.0 cm |
| Under Armour size chart (opens the brand’s site) | 12K | 11.5 | 29.5 | 18.0 cm |
| Crocs size chart (opens the brand’s site) | C12 | 12 | 27-28 | 18.3 cm |
| Jordan size chart (opens the brand’s site) | 12C | 11.5 | 29.5 | 18.4 cm |
| Nike size chart (opens the brand’s site) | 12C | 11.5 | 29.5 | 18.4 cm |
| UGG size chart (opens the brand’s site) | 12T | 11 | 30 | 18.4 cm |
| Salomon size chart (opens the brand’s site) | 12K | 11.5K | 30 | 18.5 cm |
| ASICS size chart (opens the brand’s site) | K12 | K11 | 30 | — |
| Converse size chart (opens the brand’s site) | 12C | 11.5 | 29 | — |
| Liberty size chart (opens the brand’s site) | 12C | 11C | 29 | — |
| Onitsuka Tiger size chart (opens the brand’s site) | K12 | K11 | 30 | — |
Each brand’s own kids’ chart, linked, as it prints the size; “—” where the chart has no such column. Brands that don’t print foot lengths are listed last. Not affiliated with any brand.
Convert another kids’ size
12C in every system
| System | 12C |
|---|---|
| Foot length (cm) | 18.0–18.4 |
| Foot length (in) | 7.08–7.25 |
| UK | 11.5–12 |
| EU | 29–30 |
| Japan (cm) | 18–18.5 |
| Mondopoint (mm) | 180–185 |
From the standard size tables; where the foot range spans more than one size, the first and last are shown.
Size tables checked 2026-10-23; ages from the CPSC children’s survey (Snyder et al., 1977, via NIST AnthroKids), median of girls and boys; 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.