Shoe Sizing 101: Why UK, EU & US Sizes Aren’t Always Equal

The essential guide for online buyers of children's shoes

Shopping for children's shoes online can be convenient—but confusing. You’ve found the perfect pair, added it to your cart… and now you’re faced with choosing the right size. Is a UK 8 the same as a EU 25? What about US toddler sizes? Unfortunately, it’s not always a straightforward match.

At Little Lily & Co, we want online shopping to be simple, stress-free, and accurate. Here's a quick guide to understanding how children’s shoe sizing works across different systems—and how to find the right fit for your little one.

👟 Why Shoe Sizes Vary

Shoe sizing systems are not standardised globally. Different countries use different methods to measure shoe sizes, and they don’t always align evenly. Even within one system, sizes may differ slightly between brands depending on:

• Shoe last (the shape used to model the shoe)

• Width and fit style

• Manufacturer preferences

So, while a UK 6 might generally equal an EU 23, this can vary slightly depending on the brand.

🌍 The Three Most Common Children’s Shoe Sizing Systems

🇬🇧 UK Sizes

• Start from a baby size 0 up to around size 13 (child), then move to adult sizes.

• Half sizes are common (e.g., 6, 6.5, 7).

• Used in the UK and some Commonwealth countries.

🇪🇺 EU Sizes

• Use a numerical system (e.g., 19–34 for children).

• No half sizes, so conversions can be tricky.

• Based on the length of the last in centimetres, but rounded up.

🇺🇸 US Sizes

• Separate size systems for infants, toddlers, and kids.

• Starts at size 0, moves through to youth sizes.

• Slightly larger than UK sizing (roughly one full size up).

📏 General Conversion Chart (Approximate)

Note: This chart is a guideline only. Always refer to the brand's individual size guide when available.

✨ Online Shopping Tips for Shoe Sizing Success

1. Measure Their Feet at Home
   Use a ruler or printable foot gauge to measure from heel to toe in centimetres. Do both feet—use the longer one!

2. Use the Brand’s Size Chart
   Most reputable children’s shoe brands provide conversion and insole length charts. These are more accurate than general guides.

3. Check for Sizing Reviews
   Other parents often note if a style runs small, large, or true to size.

4. Look for Adjustable Features
   Shoes with Velcro straps or elastic panels offer more wiggle room for fast-growing feet.

5. Buy from Trusted Shops With a Good Returns Policy
   At Little Lily & Co, we offer easy exchanges and friendly sizing help—so you’re never stuck with the wrong fit.

👣 Remember: It’s About Fit, Not Just the Number

A shoe should fit securely at the heel, have room to wiggle toes (about a thumb’s width), and feel snug but not tight across the top of the foot.

When in doubt, reach out! We’re always happy to help you choose the right size, whether in-store or online.

📦 Shopping online with Little Lily & Co?
Check out our Size Guide on every product page and feel free to message us with any questions.
Because the right size means happy feet—and happy feet mean happy kids.