Size 2.5C: the kids’ shoe size explained
A size 2.5C fits a foot of 9.95 to 10.4 cm (3.92 to 4.08 in): UK 2–2.5 and EU 17–18 by the standard size tables, a toddler size.
The median child’s foot reaches the middle of a 2.5C at about 8 months and stays in it for about 2 months, in the US Consumer Product Safety Commission’s survey of children.
Where 2.5C sits
After 2.5C: the next sizes
The next size, 3C, fits 4.2 mm more foot, up to 10.8 cm. Around the age a 2.5C is outgrown the median child’s foot grows about 2.9 mm a month, so it fills a 3C about 1 month later.
| Size | Foot (cm) | UK | EU | Outgrown at |
|---|---|---|---|---|
| 2.5C (this size) | 9.95–10.4 | 2–2.5 | 17–18 | about 9 months |
| 3C | 10.4–10.8 | 2.5–3 | 18–18.5 | about 11 months |
| 3.5C | 10.8–11.2 | 3–3.5 | 18.5–19 | about 13 months |
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 2 brands print for a 2.5C
| Brand | Prints | UK | EU | Foot up to |
|---|---|---|---|---|
| Vans size chart (opens the brand’s site) | 2.5C | 2 | 17.5 | 9.5 cm |
| Converse size chart (opens the brand’s site) | 2.5C | 2.5 | 18.5 | — |
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.
6 brands don’t make a 2.5C
Their kids’ charts skip it (most toddler charts print whole sizes only). For a foot that fills a 2.5C, up to 10.4 cm, their own charts give:
- adidas size chart (opens the brand’s site) 4k to 10.6 cm
- Crocs size chart (opens the brand’s site) C3 to 10.7 cm
- Jordan size chart (opens the brand’s site) 3C to 10.8 cm
- Liberty size chart (opens the brand’s site) 3C
- Nike size chart (opens the brand’s site) 3C to 10.8 cm
- Under Armour size chart (opens the brand’s site) 5K to 11.0 cm
Convert another kids’ size
2.5C in every system
| System | 2.5C |
|---|---|
| Foot length (cm) | 9.95–10.4 |
| Foot length (in) | 3.92–4.08 |
| UK | 2–2.5 |
| EU | 17–18 |
| Japan (cm) | 10–10.5 |
| Mondopoint (mm) | 100–105 |
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.