NikevsAsics, Size Comparison
Nike and Asics are both generally true to size. Your usual size should work at both brands, though fit can vary by category.
Nike vs Asics sizing, quick answer
Nike and Asics both fit true to size, so most shoppers can wear their usual size at either brand. Fit can still vary by category, check tops, bottoms and outerwear individually below.
- Nike: fits true to size
- Asics: fits true to size
- If between sizes: size up at the brand that runs smaller, or use the fit checker below for a personalised recommendation.
Brand guide
Compare how Nike and Asics usually fit, where cuts feel slimmer or roomier, and which categories are most predictable.
GENERAL BRAND GUIDANCE
This is a general brand-level sizing summary, not an exact product recommendation. For your specific size, paste a product link into the fit checker.
The Verdict
Nike sizing compared to Asics: Nike fits true to size while Asics fits true to size. Here is how the sizes translate.
Nike and Asics are both generally true to size. Your usual size should work at both brands, though fit can vary by category.
Category Match-up
Size Conversion Table
* Indicative only. For your personalised size at both brands,
Common Questions
Does Nike run smaller than Asics?
Nike and Asics both fit true to size, so most shoppers can wear their usual size at either brand. Fit can still vary by category, check tops, bottoms and outerwear individually below.
Should I size up or down at Nike vs Asics?
Neither, Nike and Asics have the same overall sizing tendency. Pick your usual size at both and refer to the category notes below.
If I'm a Medium at Nike, what size am I at Asics?
Nike and Asics have a similar overall sizing tendency, so a Medium at one is usually a Medium at the other. Category fit still varies, use the conversion table below.
Does Nike or Asics fit differently by category?
Yes, fit varies meaningfully by category. Shoes can each fit differently than the brand's overall tendency suggests. See the Category Match-up section below for per-category guidance.
Which brand is more accurate to its size chart, Nike or Asics?
Nike and Asics both publish official size charts, but real-world fit varies by fabric, cut and category. The ThisFits engine cross-references published charts with shopper fit reports across 197+ brands to predict your size in each.
What if I'm between sizes at Nike and Asics?
If you're between sizes, Nike tends to fit closer to the body, so trying the larger size first usually means fewer returns. Always confirm each retailer's return policy before ordering.