UK kids to Japanese shoe size
Links a UK size to the foot length in cm that Japanese brands print.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
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. The JP size is the foot length in cm, rounded to the nearest 0.5.
Example
Inputs: UK size = 10 (child). Result: JP size: 17 cm; Approximate foot length: 16.93 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.
- When the result falls between two sizes, the larger one is shown.
Questions about this tool
What JP size is UK kids 10?
The matching foot length is 16.93 cm, so the tool shows 17.
Why round to half a centimetre?
Japanese sizes are sold in 0.5 cm steps.
Is the new Chinese size the same as JP?
Modern Chinese sizing uses the foot length in mm, so it is close to the JP size times 10.