US to JP Kids' Shoes Size Chart
This chart converts kids' shoes sizes from United States (US) to Japanese (JP), covering 13 sizes from US 1Y to US 7Y. Each row shows the direct equivalent so you can find your size at a glance.
Whether you are shopping online from a japanese retailer or trying to interpret a foreign size label, this conversion chart gives you the mapping you need. The conversions below follow industry-standard sizing used by major brands, though individual brands may vary slightly.
For example, US 2.5Y converts to JP 21.5, and US 5.5Y converts to JP 24.5.
Quick Converter
| US | JP |
|---|---|
| 1Y | 20 |
| 1.5Y | 20.5 |
| 2Y | 21 |
| 2.5Y | 21.5 |
| 3Y | 22 |
| 3.5Y | 22.5 |
| 4Y | 23 |
| 4.5Y | 23.5 |
| 5Y | 24 |
| 5.5Y | 24.5 |
| 6Y | 25 |
| 6.5Y | 25.5 |
| 7Y | 26 |
How to Measure Your Shoes Size
The most reliable way to find your size is to trace your foot. Place a sheet of paper flat against a wall, stand with your heel touching the wall, and mark where your longest toe ends. The wall-to-mark distance in centimetres is your foot length. Do this for both feet late in the day and keep the larger figure — it is your JP size and converts cleanly into every other system listed below.
Understanding US and JP Sizing
The US sizing system is the standard in the United States and is used by most American brands. US sizes are typically numbered and can differ significantly from European or Asian systems. Most US retailers display sizes prominently on labels and online, but the underlying measurements (in inches or centimetres) vary between brands, so treating US sizes as approximate is safest.
Japanese (JP) sizes are based on centimetre measurements. For footwear, the JP size equals the foot length in centimetres, making it one of the most intuitive sizing systems in the world. For clothing, JP sizes tend to run smaller than Western equivalents because they are cut to Japanese body proportions. Always measure in centimetres when shopping with JP sizing.
Tips for Converting Kids' Shoes Sizes
JP shoe sizes are simply your foot length in centimetres — a JP 27 means a 27 cm foot. This makes Japanese sizing the easiest to verify with a ruler.
Japanese shoes sometimes run narrow compared to US shoes. If you have wider feet, consider going up 0.5 cm (half a JP size) when shopping Japanese brands like ASICS or Onitsuka Tiger.
Width matters as much as length. Some brands offer wide (W) and narrow (N) options. If standard-width shoes feel tight across the ball of your foot, try a wide version rather than going up a full size.
Sizes vary between brands — a US 10 in Nike may fit differently than a US 10 in Adidas. Always check the brand's own chart when buying online.
If you are between sizes, size up for athletic shoes (you need room for swelling during exercise) and consider sizing down for formal shoes (leather stretches over time).
Quick Reference
Quick reference: US 1Y = JP 20, US 4Y = JP 23, and US 7Y = JP 26. The full chart above covers all 13 sizes in this range.
This kids' data is also available in EU, UK, KR sizing. Use the converter tool above to switch between any pair of systems instantly.
Frequently Asked Questions
- How do I convert US kids' shoes sizes to JP?
- Use our US to JP kids' shoes size chart above. Find your US size in the left column and read across to find the JP equivalent. For example, US size 4Y equals JP size 23.
- What is US size 4Y in JP for kids' shoes?
- US size 4Y in kids' shoes is equivalent to JP size 23. This is a standard conversion used across most major brands, though fit can vary slightly between manufacturers.
- Are US and JP kids' shoes sizes the same?
- No, US and JP use different numbering systems for kids' shoes. The numbers do not match directly — for example, US 1Y corresponds to JP 20, not JP 1Y. Always use a conversion chart rather than assuming the sizes are equivalent.
- What size range does this kids' chart cover?
- This chart covers 13 sizes, from US 1Y (JP 20) to US 7Y (JP 26). Click any size in the chart for a detailed individual conversion page.
- How accurate are these kids' shoes size conversions?
- These conversions follow the industry-standard mapping used by major brands and international sizing organisations. However, individual brands may size slightly differently — a US 4Y in one brand might fit like a US 3.5Y in another. When possible, check the specific brand's size chart.
- What if I am between two kids' shoes sizes?
- If you fall between two sizes, the general advice is to size up for comfort, especially for athletic or walking shoes. You can also check whether the brand offers half sizes or fits that run large or small.
- Can I use this chart for all kids' brands?
- This chart provides the standard US to JP conversion for kids' shoes. Most mainstream brands follow this sizing closely, but some brands are known to run large or small. If accuracy is critical — for example, when ordering online with no option to try on — check the brand's own size chart alongside our conversion.