Our handy kids shoe size calculator is designed to measure the correct shoe size for children’s growing feet with two crucial measurements: foot length and foot width.
Kids Shoe Size Calculator
| Child’s Age | Foot Length (cm) | Foot Length (IN) | Growth Allowance (cm) | Growth Allowance (IN) | US Size | EU Size | UK Size |
|---|---|---|---|---|---|---|---|
| 4 years | 15.8 | 6.22 | 1.2 | 0.47 | 10K | 27 | 9 |
| 5 years | 17.0 | 6.69 | 1.3 | 0.51 | 11K | 28 | 10 |
| 6 years | 18.4 | 7.24 | 1.3 | 0.51 | 13K | 31 | 12 |
| 7 years | 19.1 | 7.52 | 1.4 | 0.55 | 1Y | 32 | 13 |
| 8 years | 20.3 | 7.99 | 1.4 | 0.55 | 3Y | 34 | 2 |
| 9 years | 21.5 | 8.46 | 1.5 | 0.59 | 5Y | 36 | 4 |
| 10 years | 22.1 | 8.70 | 1.5 | 0.59 | 5Y | 37 | 4 |
| 11 years | 23.0 | 9.06 | 1.5 | 0.59 | 6Y | 38 | 5 |
| 12 years | 24.1 | 9.49 | 1.5 | 0.59 | 7Y | 39 | 6 |
| 13 years | 25.0 | 9.84 | 1.5 | 0.59 | 8Y | 40 | 7 |
Kids Shoe Size Chart Conversion
| Age Range | US Size | UK Size | EU Size | Foot Length (cm) |
|---|---|---|---|---|
| 1-2 years | 5K | 4 | 20 | 12.1 |
| 2-3 years | 7K | 6 | 23 | 13.8 |
| 3-4 years | 9K | 8 | 25 | 15.2 |
| 4-5 years | 11K | 10 | 28 | 16.8 |
| 5-6 years | 13K | 12 | 31 | 18.4 |
| 6-7 years | 1Y | 13 | 32 | 19.1 |
| 7-8 years | 2Y | 1 | 33 | 19.7 |
| 8-9 years | 3Y | 2 | 34 | 20.3 |
Kids Shoe Size Calculation Formula
The formula for calculating toddler shoe size follows this equation:
Shoe Size = (Foot Length + Growth Allowance) × Scaling FactorWhere:
- Foot Length is measured in centimeters
- Growth Allowance is typically 1-1.5 cm
- Scaling Factor varies by region (US: 0.67, EU: 1.5)
Example calculation:
- Measured foot length: 16.8 cm
- Growth allowance: 1.2 cm
- For US size: (16.8 + 1.2) × 0.67 = 12.06 ≈ US 11K
How to Calculate Kids Shoe Size
The process of calculating a child’s shoe size is:
- Measure the Foot: Place foot on white paper, Draw outline while standing, Measure longest point (heel to toe)
- Consider Width: Measure widest part of foot, Note any specific width requirements
- Apply Regional Conversions: Use appropriate conversion charts, Consider manufacturer variations
Example measurement process:
- Child’s foot length: 17.5 cm
- Width at widest point: 7.2 cm
- Add growth allowance: (17.5 + 1.2 = 18.7 cm)
- Convert to US size: (18.7 × 0.67 = 12.5 ≈ US 12.5K)
What is a size 3 big kid?
A size 3 big kid (also written as *3Y) represents a transitional size between children’s and adult sizing. This size typically:
- Fits children aged 8-9 years
- Equals approximately EU 35
- Corresponds to women’s size 5
- Measures about 20.3 cm in length
A 9-year-old girl with foot length 20.3 cm would wear:
- US: Size 3Y
- EU: Size 35
- UK: Size 2
- Foot length range: 20.1-20.5 cm
What is a size 7 youth shoe equivalent to?
A size 7 youth shoe crosses into adult sizing territory and converts to:
- Women’s size 8.5-9
- Men’s size 7
- EU size 40
- UK size 6.5
Child wearing size 7Y (youth):
- Foot length: approximately 24.1 cm
- Perfect for transitioning to adult shoes
- Suitable for ages 12+ typically
Sources:
- Nike Size Guide: https://www.nike.com/size-fit/kids-footwear
- American Academy of Pediatrics: https://www.healthychildren.org
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