Child Shoe Size
Convert a child's foot length into US, UK and EU shoe sizes.
About Child Shoe Size
Three linear approximations map foot length to US, UK and EU children's sizes, all derived from the same measured length. Kids outgrow shoes quickly, and conversions differ by region, so a consistent formula prevents buying too-small footwear.
Formula
Child Shoe Size
UK ~ foot(cm) x 0.4 + 3; US = UK + 1; EU = foot(cm) x 1.5 + 1
- grow room
- Extra space so shoes fit for a full season
Worked example
With the default values below, Child Shoe Size returns US Size of 11. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Foot lengthaccepts 1–40 cm
- 16.5 cm
Results
- US Size
- 11
- UK Size
- 10
- EU Size
- 26
- Tip
- Add about 1 cm of grow room when buying the next size
Step by step
- 1Values used
- 2Child Shoe Size
- 3US Size= 11
- 4UK Size= 10
- 5EU Size= 26
- 6Tip= Add about 1 cm of grow room when buying the next size
Assumptions and limits
- The result is derived only from the single input listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Child Shoe Size calculated?
UK ~ foot(cm) x 0.4 + 3; US = UK + 1; EU = foot(cm) x 1.5 + 1 Three linear approximations map foot length to US, UK and EU children's sizes, all derived from the same measured length.
Why does Child Shoe Size matter?
Kids outgrow shoes quickly, and conversions differ by region, so a consistent formula prevents buying too-small footwear.
What values do I need to enter?
This calculator takes 1 input: Foot length. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.