Kids Shoe Sizes: Complete Sizing Guide

Kids shoe sizes progress from infant 0 to youth 7, then transition to adult sizing. This guide compares US, UK, and EU sizes with age ranges and foot measurements to help you find the perfect fit as children grow.

Infant and Toddler Shoe Sizes

Infant sizes 0 to 3 fit babies, toddler sizes 4 to 10 fit ages 1 to 4 years approximately.

US Size UK Size EU Size Foot Length (in / cm) Approximate Age
0 0 16 3.1 / 8 0 to 3 months
2 1 17 3.5 / 9 3 to 6 months
3 2 18 3.9 / 10 6 to 12 months
5 4 20 4.7 / 12 12 to 18 months
7 6 23 5.5 / 14 18 to 24 months
9 8 25 6.3 / 16 2 to 3 years

Little Kid Shoe Sizes

Little kid sizes 10.5 to 3 fit ages 4 to 8 years. Growth rate varies significantly by child.

US Size UK Size EU Size Foot Length (in / cm)
10.5 9.5 27 6.6 / 16.8
11.5 10.5 28 7 / 17.8
12.5 11.5 30 7.4 / 18.7
13.5 12.5 31 7.7 / 19.7
1 13 32 8.1 / 20.6
2 1 33 8.5 / 21.6
3 2 34 8.9 / 22.5

Big Kid Shoe Sizes

Big kid or youth sizes 3.5 to 7 fit ages 8 to 12 years, transitioning to adult sizes.

US Size UK Size EU Size Foot Length (in / cm)
3.5 2.5 35 9.2 / 23.5
4 3 36 9.4 / 24
5 4 37 9.8 / 25
6 5 38 10.2 / 26
7 6 39 10.6 / 27

Visual Size Comparison

Kids shoe size progression from infant to youth.

Kids shoe size comparison Infant Toddler Little Kid Big Kid

Kids Shoe Size Calculator

Find the right shoe size based on foot measurement.

How to size kids' shoes correctly

Measure first, label second

Pick a tape measurement and match it to the chart. Labels (S/M/L, US/UK/EU numbers) drift between brands; the underlying body measurement does not. Trace the child's foot on paper and measure heel-to-longest-toe in cm. Refer back to the chart — do not buy by their last size.

Picking between two sizes

Kids grow ~half a size every 4–6 months between ages 2 and 6. Buy a half size up; do not go more, since flopping shoes affect gait. Recheck every 8 weeks under age 4.

Brand and regional variation

The same labeled size can differ by a full size between brands and regions. Asian brands generally run a half size smaller than US brands; European brands fall in between. When in doubt, use the centimetre or inch measurement on the size chart, never the letter.

Common mistakes

  • Sizing by your old favourite without checking the new brand's chart.
  • Skipping the measurement step. Body shape changes; old numbers go stale.
  • Picking too tight in non-stretch fabrics — they don't break in the way leather does.
  • Trusting a single review's "runs small / runs large" without looking at the reviewer's measurements.