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Children’s shoe size converter

Foot length first, with a wide age range when that is all you have.

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Ireland uses the same clothing and shoe sizes as the UK. Brands still vary from any chart.

Around 4 years the usual UK range on this band is 9 to 11 (159–176 mm). Measure the foot. Age alone is a range.

UK and EU sizes and the millimetre column are the Clarks fit guide. The age bands are wide on purpose and are not a Clarks column. US children’s labels are often half a size to one size above the UK number (5½–6 for a UK 5). After UK 13½ the UK count restarts at 1.

Children’s shoes by foot length. Age column is the approximate band that contains the row, where one exists.
ScaleUK/IrishEUFoot mmUS, oftenApprox. age
Child217½1012½–3Under 1 year
Child2½181053–3½Under 1 year
Child318½1093½–4Under 1 year
Child3½191134–4½Under 1 year
Child4201174½–5Under 1 year
Child4½20½1225–5½1 to 2 years
Child5211265½–61 to 2 years
Child5½221306–6½1 to 2 years
Child622½1346½–71 to 2 years
Child6½231387–7½2 to 3 years
Child7241427½–82 to 3 years
Child7½251478–8½2 to 3 years
Child825½1518½–92 to 3 years
Child8½261559–9½3 to 4 years
Child9271599½–103 to 4 years
Child9½27½16410–10½4 to 5 years
Child102816810½–114 to 5 years
Child10½28½17211–11½4 to 5 years
Child112917611½–124 to 5 years
Child11½29½18112–12½5 to 6 years
Child123018512½–135 to 6 years
Child12½3118913–13½6 to 7 years
Child133219313½–146 to 7 years
Child13½32½19814–14½6 to 7 years
Junior1332021½–27 to 8 years
Junior1½33½2062–2½7 to 8 years
Junior2342102½–37 to 8 years
Junior2½352143–3½8 to 10 years
Junior335½2193½–48 to 10 years
Junior3½362234–4½8 to 10 years
Junior4372274½–58 to 10 years
Junior4½37½2315–5½10 to 12 years
Junior5382365½–610 to 12 years
Junior5½392406–6½10 to 12 years
Junior639½2446½–710 to 12 years
Junior6½402497–7½—
Junior7412537½–8—
Junior7½41½2578–8½—
Junior8422618½–9—
Junior8½42½2659–9½—
Junior9432699½–10—
Junior9½4427410–10½—
Junior1044½27810½–11—

These are standard published conversions. A label from one brand can sit a size either side of the chart.

How to use it

  1. Measure the longer foot in millimetres, with the child standing.
  2. Match that length to the Clarks chart. If you only have an age, read the range, then still measure.
  3. Use the larger size when the length sits between two rows, and remeasure every few months.

Length first, age second

The UK, EU and millimetre columns are the Clarks UK fit guide. A child size 9 is EU 27 and 159 mm. After 13½ the UK count restarts at junior 1, which on that guide is EU 33 and 202 mm. The EU steps are the Clarks steps. They are not a smooth “add one” from the row above.

Age is a wide band on this page, and it is not a Clarks column. A four-year-old on the band used here spans several UK sizes. Children the same age have different feet, and feet grow in spurts. The converter returns the whole band so a single size is not invented from a birthday.

US labels and the restart at 13

US children’s sizes are often printed half a size to one size above the UK number, so a UK 5 is often somewhere from US 5½ to US 6. Charts differ by about that much, which is why the US column is a range. When the UK size restarts at 1, the US youth numbering restarts as well, and the same half-to-one offset is the usual published pattern.

Measure both feet and keep the longer one. Leave room to grow, within the brand’s own advice, and check width: Clarks also fits F, G and H widths, which this length chart does not convert. Ireland uses the same children’s shoe sizes as the UK. These rows are a published chart. Two brands with the same number can fit differently, and a garment can be cut for a different body than the chart assumes.

Questions

Can I buy from an age?

Use the age only to see a range. Order from the foot measurement in millimetres. The range is there so a birthday does not get treated as a size.

What happens after UK 13?

The scale continues 13, 13½, then junior 1, 1½, 2 and so on. Junior 1 is a larger shoe than child 13½. The table marks which scale each row belongs to.

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