About LittleSizes

LittleSizes was built out of a very familiar frustration: buying kids' clothes online and having no idea what size to order.

When you're shopping across different countries and brands — whether it's a Zara find from Spain, an H&M order from Germany, or a gift from a US relative — the size labels mean completely different things. A "3 years" in one brand can be a full size smaller than the same label in another.

We built this free tool so that parents, grandparents, and gift buyers can quickly find the right kids clothing size without having to cross-reference multiple charts on different websites.

All you need is your child's age or their height in centimetres. We'll show you the equivalent sizes across EU, US, UK, and FR/IT systems, plus a handy reference for popular brands like Zara, H&M, Next, and Boden.

The tool also includes a kids shoe size chart by age, covering EU, US, UK and FR/IT shoe sizes — another common headache for parents shopping internationally.

Please note that all sizes shown are approximate guides. Children's bodies differ, and brand sizing can vary significantly even within the same label. When in doubt, we always recommend sizing up — especially for items that can't easily be returned.