Size Converter
Select two brands and a clothing category to convert sizes instantly
No sizes available for this combination
Understanding Clothing Size Differences Between Brands
If you've ever wondered why a Medium in one brand fits perfectly while the same size in another brand is too tight or too loose, you're experiencing the reality of non-standardized clothing sizing. Unlike shoes (which are measured in precise units), clothing sizes like S, M, L, and XL have no universal standard. Each brand defines their own measurements for each size label.
American brands like Nike, Gap, and Old Navy tend to use more generous sizing. A Nike Medium, for example, typically fits a chest measurement of 37.5-41 inches. European brands like Zara, Adidas, and H&M lean toward slimmer cuts, where a Medium might correspond to 37-40 inches. This difference of even 1-2 inches can mean the difference between a comfortable fit and an awkward one.
The problem gets more complex with fast-fashion brands like Zara and Forever 21, where sizing can vary not just between brands but between different collections within the same brand. A Zara Medium from their TRF line can fit very differently from their main collection Medium.
That's exactly why we built SizeMatch. Our converter uses actual measurement data from official brand size charts — not just label matching — to find your equivalent size across 10 popular brands. For the most accurate results, we recommend:
- Take your body measurements using our Measurement Guide
- Check the source brand's size chart to confirm your starting size
- Use the converter above to find your target brand equivalent
- Always check the specific product's size guide when available, as styles within a brand can vary
Key Sizing Facts at a Glance
Brands that run large:
Old Navy, Gap, Nike — if between sizes, the smaller size often works.
Brands that run small:
Zara, Forever 21, Adidas — consider sizing up one from your usual American size.
Most consistent sizing:
Uniqlo, H&M — their sizes are closest to standardized US measurements.
Most variable sizing:
Forever 21, Zara — fast-fashion cycles mean sizes can vary between collections.