What is a size 10?How girls' and boys' size 10 compare across 34 kids' brands

A size 10 is designed with 10-year-olds in mind, but age is only a rough guide. Because it is built around height and build, plenty of children wear a size 10 a year earlier or later than the label suggests. Checking your child's height against a specific brand's chart is far more reliable than going by age alone.

Most brands cut a girls' size 10 for about 53–55" and a boys' size 10 for about 53–57", but across brands the label covers 52–58" — that full span is the honest answer. Check your child's height against the brand you are buying.

Not always. Many brands publish one unisex size 10 that covers both, but 20 of the 34 brands here chart girls and boys separately — and where they do, the two can differ by an inch or more at the same number. The table above shows both, so you can compare the one that matches your child.

Neither, reliably — a size 10 is not standardized. Across these 34 brands it covers heights from 52 to 58", a spread of about 6 inches, so "big" or "small" only means anything next to a named brand.

No, and there is no industry standard that would make it so. Each brand sets its own size 10 height range, which is why the number cannot be carried from one brand to the next: the size that fits in one can be short or roomy in another under an identical label.

Some brands do — the same numbered size, taken in or let out through the waist and seat rather than cut to a different height. Little & Youth tracks those separately: see the slim, plus and husky guides for which brands publish them and how they compare.

After a size 10, most brands move to a size 12. Sizing can shift noticeably at that step, so it is worth checking the next size's height range rather than assuming it picks up exactly where size 10 left off.

When your child's height is near the top of a brand's published size 10 range, check that brand's a size 12 before buying — the next size's range doesn't always pick up where size 10 ends. We can't predict how long a garment lasts, so we point you to the boundary, not a guess.

Among the brands here, Converse Kids cuts the longest size 10, fitting up to about 58 inches of height. That is about published height only — it says nothing about how long the garment itself lasts.