Do adidas Running Shoes Run Big or Small?

What the Feetlot Data Says About adidas Running Sizing

Based on 116 owner-reported pairs across 27 adidas Running models in the Feetlot database, the brand lands on the snug side of true to size. The central tendency is a clear lean toward running smaller than the Nike Air Force 1, the reference shoe Feetlot uses as its baseline. In plain terms, the typical adidas performance running shoe comes up about half a size smaller than that baseline, which is why so many runners reach for a half size up. Note this is the adidas performance running line (Supernova, adizero, Climacool, Falcon), not the adidas Originals lifestyle range, which is tracked separately and fits differently.

The more useful finding is consistency, and here adidas Running scores moderate. Sizing varies a fair amount model to model: most of the line pulls about half a size small, a couple run a full size small, and a meaningful group sits true to size. The half-size-up default is right for most models but will mislead you on some, so check the specific shoe before you commit.

Which adidas Running Shoes Run Big, and Which Run Small

None of the adidas Running models in the Feetlot data run genuinely big. The real question is how small each one runs, and the lineup splits into three bands: a few that run a full size small, the bulk that run about half a size small, and a group that lands true to size.

adidas Running models that run a full size small (size up one)

The snuggest models come up about a full size small. The CLIMACOOL Oscillation M runs about a full size small and is one of the more-owned shoes in this group, so the size-up-one call is well supported. The trail-oriented Kanadia 4 TR M runs about a full size small as well. For both, take a full size up rather than the usual half.

adidas Running models that run small (size up about a half size)

This is the largest group and the one that drives the brand verdict. The most-owned model in the dataset, the supernova Glide 4 M, runs about half a size small, and so does the popular Falcon Elite M, the two best-supported calls in the line. The Supernova cushioning family behaves the same across generations, with the Supernova Sequence 5 M and Supernova Sequence 4 M both about half a size small. The adizero racing line is just as snug, matching its reputation: the adiZero Boston 3 M, adizero F50 2 M, and adizero Tempo 5 M all come up about half a size small. For this band, a half size up is the common recommendation, with room for swelling on long runs.

adidas Running models that run true to size

On the other side, a solid group lands right at true to size. The Duramo 4 M, one of the most-owned shoes in the data, is true to size, as is the CLIMACOOL Ride TR M and the adiStar Ride 4 M. Within the otherwise-snug racing and Falcon families two models break the pattern: the Falcon Elite 2 M and the adiZero Adios 2 M both run true to size. For these, your standard sneaker size is the right starting point. Note the Boost-era models in particular are known to feel snug and long in the toe, exactly the snug-but-not-short pattern the data shows.

How to Find Your adidas Running Size

Because consistency is only moderate, start from the half-size-up default and then adjust by model and foot shape.

• Most performance running models (Supernova, adizero Boston, F50, Tempo, Falcon Elite): Size up a half size from your everyday sneaker size. These run snug and feet swell on long runs, so the room pays off.
• The snuggest models (Climacool Oscillation, Kanadia trail): Size up a full size. These come up a full size small, so a half is not enough.
• True-to-size models (Duramo, Climacool Ride TR, adiStar Ride, Falcon Elite 2, adiZero Adios 2): Start at your true size; these fit on the number.
• Lifestyle crossover: Do not size adidas Running off an adidas Originals pair; the performance line runs snugger on a different last.
• Wide feet: The Boost and adizero uppers run narrow with a long but snug toe box, so width is the real constraint. Look for wide variants rather than chasing room with a full size up.
• Narrow feet: The snug racing fit works in your favor. Stay at the half-up default and use a heel-lock lacing to lock the midfoot.
• Measure first: Measure both feet in the evening, in centimeters, and match the chart below.

adidas Running vs Other Brands

Against the major brands, adidas Running sits in the middle of the sizing spectrum on length. In the Feetlot data it fits about the same on average as Nike, so if you wear a size 10 in Nike, you wear about a size 10 in adidas Running, and the half-size-up advice above is about the specific snug models rather than a brand-wide gap versus Nike. It also fits about the same as New Balance, Brooks, ASICS, and Vans on average, so a straight same-number transfer from any of those is a reasonable starting point before the model-level adjustment.

adidas Running fits about the same as the adidas Originals lifestyle line on average too, though the two ranges sit on different lasts, so the labeled size carries across but the shape does not. The one clear exception is Converse, which runs about half a size bigger-fitting than adidas Running, so you would buy a half size smaller number in Converse than you take here. The practical summary: adidas Running is in the same length neighborhood as the other big running and sneaker brands, and the real work is picking the right model-specific adjustment within the line.

adidas Running Size Chart (US / UK / EU)

Standard adidas men's conversion. Measure foot length in centimeters and match the nearest size, rounding up if between sizes.

For adidas women's sizing, subtract roughly 1.5 from the US men's number; EU and centimeter values stay the same for a given foot length.

How Feetlot Measures This

Feetlot fits a global offset model to more than 100,000 owner-reported shoe records. Each shoe gets a single number that captures how its fit drifts from the reference shoe, the Nike Air Force 1. Aggregating those numbers across every model in a brand reveals the brand's overall pattern, how consistent it is, and which models break from it. For adidas Running, that aggregation across 116 pairs and 27 models separated the snug Supernova and adizero flagships from the daily trainers that fit on the number. To get a personal recommendation, sign in and add the shoes you own and how they fit, and Feetlot will translate your real fits into a predicted size across the lineup.