UK kids shoe size to cm
Choose a UK size to see the foot length it is made for.
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How to use it
- Enter uk size.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
UK child size = 3 × last length (in) − 12; UK adult size = 3 × last − 25. Last length = foot length + 2/3 in. Combined: foot length (in) = (UK child + 10) ÷ 3.
Example
Inputs: UK size = 5 (child). Result: Approximate foot length: 12.7 cm; Foot length in inches: 5 in; Last length: 14.39 cm.
Limits and caveats
- The last is taken as 2/3 in (about 17 mm) longer than the foot; some European makers add only 13 mm.
- Brands differ by half a size to a full size, so check the brand chart before you buy.
Questions about this tool
How long is UK child size 0?
Its last is 4 inches by definition, which fits a foot of about 8.5 cm.
How much does each UK size add?
One third of an inch, 8.47 mm per full size.
Is adult 1 bigger than child 13?
Yes. Adult 1 follows child 13.5 and is one full size above child 13.