100% Free
WhatSizer is completely free to use - no subscriptions, no hidden fees
Instant Fit
Enter your child's age and size to get the right fit immediately

Future Size Forecast
See what size they'll need next season

Size Converter
Convert sizes across brands and countries

Easy Sharing
Share size info with grandparents and friends

Free & Fast
100% free to use and built for growing kids

Remember Sizes
Track your kid's growth—no more size guessing.
Next Season's Sizes
We use WHO growth data to predict what they'll need next.
Shop Smarter
Find clothes and shoes that fit—season after season.

Share WhatSizer with Friends and Family
Help other parents find the right sizes for their children by sharing WhatSizer with your network.