convertfig
USUKAU

Children's Shoe Size Chart

Kids' US 13 (child) = UK 12.5 (child) = AU 12.5 (child) = EU 31 (foot about 19.2 cm).

Try your own numbers

Sizes for
Convert from

Half sizes are fine, for example 9.5.

Assumptions (editable)
cm

A shoe is longer than the foot inside it. The starting allowance is 1.7 cm for men, 1.2 cm for women and 1.5 cm for kids (an editorial figure fitted to the published charts). Leave the box blank to use it.

UK size12.5 (child)
US kids’13 (child)
AU12.5 (child)
EU31
Foot length19.2 cm (7.58 in)

Shoe length 20.74 cm (foot 19.2 cm plus 1.5 cm allowance). UK size = shoe length in inches × 3 − 12 (child sizes, restarting at 1 after 13½). EU size = shoe length in cm × 1.5, to the nearest half. US kids’ = UK + ½; AU = UK.

Sizes vary by brand. If you are between sizes, size up or check the brand’s own chart.

Fig. 1 The size in every system.

Every formula is tested against worked examples. How we check

USUKAUEUFoot (cm)Foot (in)
5.5 (child)5 (child)5 (child)21.512.95.08
6 (child)5.5 (child)5.5 (child)2213.35.24
6.5 (child)6 (child)6 (child)2313.75.41
7 (child)6.5 (child)6.5 (child)23.514.25.58
7.5 (child)7 (child)7 (child)2414.65.74
8 (child)7.5 (child)7.5 (child)25155.91
8.5 (child)8 (child)8 (child)25.515.46.08
9 (child)8.5 (child)8.5 (child)2615.96.24
9.5 (child)9 (child)9 (child)26.516.36.41
10 (child)9.5 (child)9.5 (child)27.516.76.58
10.5 (child)10 (child)10 (child)2817.16.74
11 (child)10.5 (child)10.5 (child)28.517.66.91
11.5 (child)11 (child)11 (child)29187.08
12 (child)11.5 (child)11.5 (child)3018.47.24
12.5 (child)12 (child)12 (child)30.518.87.41
13 (child)12.5 (child)12.5 (child)3119.27.58
13.5 (child)13 (child)13 (child)3219.77.74
1 (youth)13.5 (child)13.5 (child)32.520.17.91
1.5 (youth)1 (youth)1 (youth)3320.58.08
2 (youth)1.5 (youth)1.5 (youth)33.520.98.24
2.5 (youth)2 (youth)2 (youth)34.521.48.41
3 (youth)2.5 (youth)2.5 (youth)3521.88.58
3.5 (youth)3 (youth)3 (youth)35.522.28.74
4 (youth)3.5 (youth)3.5 (youth)3622.68.91
4.5 (youth)4 (youth)4 (youth)3723.19.08
5 (youth)4.5 (youth)4.5 (youth)37.523.59.24
5.5 (youth)5 (youth)5 (youth)3823.99.41
6 (youth)5.5 (youth)5.5 (youth)38.524.39.58
6.5 (youth)6 (youth)6 (youth)39.524.79.74

Fig. 2 Kids' sizes in every system, in half sizes. Built from one rule set (see how it works); brands differ.

Last checked 11/11/2026. Sources: size.ly: International shoe size conversion chart for women and men (foot length, UK, US, EU; one-third inch steps; Paris point about 6.7 mm); size.ly: Kids shoe size chart (baby and children, US, UK, EU); RunRepeat: Shoe size conversion guide (UK does not separate men’s and women’s sizes; US does).

Children's Shoe Size Chart: the working

US kids' sizes run 1 to 13½ and then restart at 1 for youth sizes. UK kids' sizes also restart after 13.

Shoe length 20.74 cm (foot 19.2 cm plus 1.5 cm allowance). UK size = shoe length in inches × 3 − 12 (child sizes, restarting at 1 after 13½). EU size = shoe length in cm × 1.5, to the nearest half. US kids’ = UK + ½; AU = UK.

Common questions

Is this the same in every brand?

No. Sizing is not standardised, so use this as a starting point. If you are between sizes, size up or check the brand’s own chart.

What foot length does it match?

About 19.2 cm.

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