Kids' shoe size conversion
Quick answer: kids' US sizes split into C (child) and Y (youth) ranges that restart at 1 — a 13C and a 1Y are neighbours, not the same shoe. Measure your child's foot in cm and read across; that avoids the C/Y confusion entirely.
| US | UK | EU | Foot length (cm) | JP (cm) |
|---|---|---|---|---|
| 4C | 3.5 | 19.5 | 11 | 11 |
| 5C | 4.5 | 21 | 12 | 12 |
| 6C | 5.5 | 22 | 13 | 13 |
| 7C | 6.5 | 23.5 | 14 | 14 |
| 8C | 7.5 | 25 | 15 | 15 |
| 9C | 8.5 | 26 | 16 | 16 |
| 10C | 9.5 | 27 | 16.5 | 16.5 |
| 11C | 10.5 | 28 | 17.5 | 17.5 |
| 12C | 11.5 | 30 | 18.5 | 18.5 |
| 13C | 12.5 | 31 | 19 | 19 |
| 1Y | 13.5 | 32 | 19.5 | 19.5 |
| 2Y | 1 | 33 | 20.5 | 20.5 |
| 3Y | 2 | 34.5 | 21.5 | 21.5 |
| 4Y | 3 | 36 | 22.5 | 22.5 |
| 5Y | 4 | 37 | 23 | 23 |
| 6Y | 5 | 38.5 | 24 | 24 |
Read this first: sizes vary by brand and model. This is the general international chart — check the brand's official chart before you buy, and convert from foot length in cm for the most reliable result.
Frequently asked questions
What does the C and Y mean in kids' sizes?
C stands for Child (toddler and little-kid sizes, roughly up to US 13C) and Y stands for Youth (bigger kids, US 1Y to 6Y, before adult sizing).
How fast do kids outgrow sizes?
Feet grow fastest under age 3 — often a full size every few months. Measure every 2–3 months and leave about 1 cm of growing room, no more.
When do kids move to adult sizes?
After US 6Y / 7Y most ranges switch to adult men's or women's charts. A 6Y is close to a women's US 7.5–8 in length, but the fit differs.