International Size Comparison
Compare sizes across all regions in one place
Quick Size Comparison
Quick Access by Category
Frequently Asked Questions
Why do international sizes differ so much?
Different countries use different measurement systems and standards. The US uses inches, Europe uses centimeters, and Japan uses its own sizing system. These historical differences persist because each region's fashion industry developed independently.
Can I trust these size conversions when shopping online?
Our conversions are based on standard international sizing charts and are accurate for most brands. However, sizing can vary between manufacturers, so always check the retailer's specific size chart and read customer reviews when available.
Should I size up or down when converting sizes?
Generally, use the exact converted size as a starting point. If you're between sizes or if customer reviews mention the brand runs small/large, adjust accordingly. For shoes, consider sizing up if you have wide feet or plan to wear thick socks.
Why do some items not convert directly between sizes?
Some categories like bras have complex sizing systems that don't map 1:1 across regions. Additionally, vanity sizing (making clothes run larger than labeled) varies by country and brand, which can affect conversions.
How can I save my common size conversions?
Use the bookmark feature to save sizes you use frequently. All bookmarks are stored locally in your browser and can be accessed anytime. You can also use our Size History page to track all your past conversions across categories.
Exploring more conversion helpers? Visit RankMaven — Visual Tier List Creator.