Kids' Clothing Size: Intl to UK
This page converts kids' clothing sizes from the international (S–XXL) system to the UK system. It is the quick reference you need when shopping from foreign retailers, where the same garment carries very different numbers depending on the country of origin.
For example, a kids' international 5-6Y is typically a UK 5-6. International labels use letters (S, M, L) rather than numbers, so expect a range rather than an exact match.
Keep in mind that clothing equivalences are a starting point, not a guarantee: so-called vanity sizing means two brands can label a garment of identical measurements differently. So alongside this chart, it is worth checking each brand's own size guide and, above all, looking at the actual measurements in centimetres.
Clothing size converter — Kids'
Convert to UK
5-6
Full conversion table
| Intl | UK |
|---|---|
| 2-3Y | 2-3 |
| 3-4Y | 3-4 |
| 4-5Y | 4-5 |
| 5-6Y | 5-6 |
| 6-7Y | 6-7 |
| 7-8Y | 7-8 |
| 8-9Y | 8-9 |
How to take your measurements
For kids' clothing, height is the most reliable guide, since sizes are based mainly on stature and age. Measure the child barefoot with their back to a wall and compare their height to the size. Because children grow quickly, size up if they are between two sizes.
Frequently asked questions
What UK size is my international (S–XXL) kids' size?
Select your international (S–XXL) size in the calculator and we show the equivalent UK size for kids' clothing. Use it as a starting point and confirm with the brand's measurements.
Why does the same size fit differently between brands?
Because of vanity sizing: each brand tweaks its patterns, so two garments of the same nominal size can have different measurements. Go by the actual measurement in centimetres where you can.
Does this chart work for every type of garment?
It is a general size equivalence. For closely fitted or structured pieces (jeans, suits), always check the brand's specific size guide.
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