Kids' Shoe Size Guide

The single biggest source of confusion in children's footwear is that the US scale is not one continuous run of numbers. It is three separate bands stacked on top of one another, and each band restarts its count from a low number. Toddler/Infant sizes carry a "C" suffix (for "child") and climb from roughly US 0C up to 10C. Little Kids continue with the same "C" marking but pick up at 10.5C and run to 13.5C. Then the scale resets one final time: Big Kids sizes carry a "Y" suffix (for "youth") and begin again at 1Y. This is why a Big Kids 1 sits directly above a Little Kids 13½ on the foot-length axis, even though "1" looks like a smaller number than "13½".

The trick to navigating the reset is to ignore the printed number and read the foot length in centimetres instead, which is the one figure that never restarts. A Little Kids 13.5C and a Big Kids 1Y differ by only a single half size in actual length, so the jump between tiers is far smaller than the numbers suggest. When you shop across the boundary — for example replacing an outgrown 13C pair with the next size up — always cross-check the cm column in the tables above rather than trusting the label alone, because the same digit can mean wildly different things depending on which band it belongs to.

The Big Kids band tops out around US 7Y, and that is precisely where the youth scale rejoins adult sizing. As a rule of thumb, a Big Kids size is roughly one size smaller than the equivalent men's size — GS ≈ men's US − 1 — so a Big Kids 6Y lands close to a men's US 7, and a Big Kids 7Y meets a men's US 8. The relationship to women's sizing is a touch wider: a Big Kids size sits roughly 1.5 to 2 sizes below the matching women's size. A Big Kids 5Y therefore lines up with about a women's US 6.5 to 7, and a 6Y with roughly a women's 7.5 to 8. These are approximate guides only, because lasts differ between a brand's youth and adult lines.

The practical upshot is that adults with smaller feet can often buy from the Big Kids range and save money, since youth shoes are usually cheaper and exempt from the price premium of adult sizing. A woman who normally takes a US 7 can reasonably try a Big Kids 5Y or 5.5Y, and a man at the bottom of the adult scale may find a 7Y fits. The caveat is fit rather than length: youth shoes are built on a wider, more flexible last with lighter cushioning suited to a growing foot, so the heel hold and arch support can feel different even when the length matches. Try before committing, and treat the conversions here as a starting point you confirm against the cm measurement.

Children's feet need room to grow, so the goal is never a snug, just-right fit the way it would be for an adult. Aim for about a thumb's width — roughly 1 to 1.5 cm — of space between the longest toe and the end of the shoe when your child is standing. Measure both feet at the end of the day, when they are at their largest, and always fit to the bigger foot. Because the canonical reference in every chart on this page is foot length in centimetres, the cleanest method is to measure the foot, add your growing room, and then read across to the size — rather than guessing from last season's label.

Young feet grow remarkably fast, which is why the size you bought a couple of months ago may already be too small. Check toddlers' fit every 6 to 8 weeks, and re-measure older children every few months, as feet can gain half a size in a single season. Resist the temptation to oversize too far to stretch the value of a pair: a shoe that is more than about a size too big shifts on the foot, changes how a child walks, and can affect their developing gait and balance. The sweet spot is enough room to grow into over the coming weeks, but not so much that the shoe is loose today.