Size 10.5C: the kids’ shoe size explained
A size 10.5C fits a foot of 16.7 to 17.1 cm (6.58 to 6.75 in): UK 10–10.5 and EU 27.5–28 by the standard size tables, a little kid size.
The median child’s foot reaches the middle of a 10.5C at about 5 years and stays in it for about 5 months, in the US Consumer Product Safety Commission’s survey of children.
Where 10.5C sits
After 10.5C: the next sizes
The next size, 11C, fits 4.3 mm more foot, up to 17.6 cm. Around the age a 10.5C is outgrown the median child’s foot grows about 0.9 mm a month, so it fills an 11C about 5 months later.
| Size | Foot (cm) | UK | EU | Outgrown at |
|---|---|---|---|---|
| 10.5C (this size) | 16.7–17.1 | 10–10.5 | 27.5–28 | about 5 years |
| 11C | 17.1–17.6 | 10.5–11 | 28–28.5 | about 5½ years |
| 11.5C | 17.6–18.0 | 11–11.5 | 28.5–29 | about 6 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 8 brands print for a 10.5C
On the brands’ own charts a 10.5C is for a foot of up to 16.5 cm (Under Armour) to 17.1 cm (Nike); the standard is 17.1 cm. Check the brand’s chart before you buy.
| Brand | Prints | UK | EU | Foot up to |
|---|---|---|---|---|
| Under Armour size chart (opens the brand’s site) | 10.5K | 10 | 27.5 | 16.5 cm |
| Vans size chart (opens the brand’s site) | 10.5C | 10 | 27 | 16.5 cm |
| adidas size chart (opens the brand’s site) | 10.5k | 10k | 28 | 16.6 cm |
| On size chart (opens the brand’s site) | 10.5K | 10K | 27.5 | 16.7 cm |
| Salomon size chart (opens the brand’s site) | 10.5K | 10K | 28 | 17.0 cm |
| Jordan size chart (opens the brand’s site) | 10.5C | 10 | 27.5 | 17.1 cm |
| Nike size chart (opens the brand’s site) | 10.5C | 10 | 27.5 | 17.1 cm |
| Converse size chart (opens the brand’s site) | 10.5C | 10 | 27 | — |
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.
3 brands don’t make a 10.5C
Their kids’ charts skip it. For a foot that fills a 10.5C, up to 17.1 cm, their own charts give:
- Crocs size chart (opens the brand’s site) C11 to 17.4 cm
- Liberty size chart (opens the brand’s site) 11C
- UGG size chart (opens the brand’s site) 11T to 17.6 cm
Convert another kids’ size
10.5C in every system
| System | 10.5C |
|---|---|
| Foot length (cm) | 16.7–17.1 |
| Foot length (in) | 6.58–6.75 |
| UK | 10–10.5 |
| EU | 27.5–28 |
| Japan (cm) | 17–17.5 |
| Mondopoint (mm) | 170–175 |
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.