Kids Shoe Size Chart & Calculator

Foot length (heel to longest toe)

Child's age

Less precise than measuring — every child's feet grow at a different rate.

Estimated size

UK size

EU size

Shoe sizing charts vary by brand and style — treat this as a starting point, not a guarantee of fit. For the best fit, measure both feet at the end of the day (feet swell slightly), and leave about 1cm (roughly a thumb's width) of extra room at the toe for growth.

How this is calculated

Foot-length-based sizing works by matching a measured foot length (heel to the tip of the longest toe) against a reference table of typical lengths for each shoe size. This calculator's table steps through infant, toddler and youth sizing in the increments the industry commonly uses, and reports the closest match in US, UK and EU numbering side by side, since all three scales are widely used on shoe boxes and labels.

The "by age" option instead interpolates a typical foot length for a given age from average growth data, then runs that estimated length through the same size table. It's inherently less precise than measuring directly, since children's foot growth rates vary quite a bit — it's offered as a convenience for a rough estimate, not as a substitute for measuring.

US, UK and EU sizing scales each start counting from a different reference point and use slightly different unit steps, which is why the three numbers shown for the same foot length look so different from one another even though they describe the same physical size.

Common edge cases & things to know

It's common for one foot to be very slightly longer than the other — when that happens, fit shoes to the larger foot rather than splitting the difference.

Young children's feet can grow noticeably every couple of months, especially in the toddler years, so a size that fits well today may be snug in as little as 8–12 weeks. Re-measuring regularly (rather than assuming a size will last a full season) helps avoid shoes that pinch without your child necessarily saying so.

Sizing tables and last shapes vary between brands, and even between styles from the same brand, so this result is best treated as a starting point for trying shoes on rather than an exact match every time.

A shoe that's too tight can be uncomfortable right away, but one that's too loose can also cause tripping or blistering, so "sized up for growing room" only works within reason — roughly a thumb's width of extra space at the toe is the commonly cited sweet spot, not a full size or more.

Sources

General foot health and fit guidance referenced from the American Podiatric Medical Association (APMA) and HealthyChildren.org. Specific size charts vary by manufacturer, so always confirm fit against a brand's own sizing guide when possible.