Home / Kids Shoe Sizes / Children's Shoe Size Calculator

Children's Shoe Size Calculator

Enter your child's foot length in cm and get their UK, US and EU shoe size instantly. Free calculator with full foot length to shoe size chart, measurement guide and age reference.

Related: 🗡 All Kids Sizes 🇺🇸 UK to US 🇪🇺 EU to UK 📅 By Age 📐 Calculator

Children's shoe size calculator — foot length to shoe size

The most accurate way to find your child's shoe size is to measure their foot in centimetres and look up the result. Age guides and label sizes are unreliable — foot length in cm is the only measurement that converts directly and consistently across UK, US and EU sizing systems.

Find shoe size from foot length

Foot length to shoe size chart — full reference

Use this chart to convert any foot length in cm to UK, US and EU children's shoe sizes. For the most accurate result, measure both feet and use the larger measurement, then add 1–1.5cm for growing room.

Foot length (cm)UK KidsUS KidsEUAge (approx.)
9–10 cmUK 0US 1EU 15–16Newborn–3m
10.5 cmUK 1US 2EU 173–6 months
11.5 cmUK 2US 3EU 18–196–9 months
12.5 cmUK 3US 4EU 19–209–12 months
13.5 cmUK 4US 5EU 20–2112–18 months
14.5 cmUK 5US 6EU 2218–24 months
15.5 cmUK 6US 7EU 232–3 yrs
16.5 cmUK 7US 8EU 24–253–4 yrs
17.0 cmUK 8US 9EU 264–5 yrs
18.0 cmUK 9US 10EU 275–6 yrs
19.0 cmUK 10US 11EU 28–296–7 yrs
20.0 cmUK 11US 12EU 29–307–8 yrs
20.5 cmUK 12US 13EU 30–318–9 yrs
21.0 cmUK 13US 1YEU 31–329–10 yrs
22.0 cmUK 1JUS 2YEU 3310–11 yrs
22.5 cmUK 2JUS 3YEU 34–3511–12 yrs
23.0 cmUK 3JUS 4YEU 35–3612+ yrs
24.0 cmUK 4JUS 5YEU 3713+ yrs
24.5 cmUK 5JUS 6YEU 3813+ yrs

How to measure your child's foot in cm

You don't need any special equipment — just a piece of paper, a pencil and a ruler. Here's the correct method:

  • Step 1: Place a piece of A4 paper on a hard floor (not carpet)
  • Step 2: Have your child stand on the paper wearing the socks they'll wear with the shoes
  • Step 3: Trace around both feet with a pencil held vertically (not at an angle)
  • Step 4: Measure the longest distance heel to toe on each foot tracing
  • Step 5: Use the larger of the two measurements
  • Step 6: Add 1–1.5cm growing room, then match to the chart above
💡 Measure in the afternoon — feet swell slightly through the day and are largest in the afternoon or evening. Measuring in the morning can result in shoes that feel tight by lunchtime.

Frequently asked questions

My child's foot is 17cm — what shoe size is that?

A 17cm foot corresponds to UK 8 (US 9, EU 26) in children's shoe sizing. This is typically worn by children aged 4–5 years. Remember to add 1–1.5cm growing room when buying, so you'd look for a shoe with an insole length of around 18–18.5cm.

My child's foot is 19cm — what size is that?

A 19cm foot is UK 10 (US 11, EU 28–29), typically worn by children aged 6–7 years.

My child's foot is 21cm — what size is that?

A 21cm foot is UK 13 (US 1 Youth, EU 31–32). This is the last size in the standard children's range before junior sizing begins, typically around age 9–10.

How much growing room should I add?

Add 1–1.5cm (about a thumb's width) beyond the longest toe. Less than 1cm means the shoe is already too small. More than 1.5cm means it may cause tripping or blisters from excessive movement inside the shoe.