Do adidas Shoes Run Big or Small?

What the Feetlot Data Says About adidas Sizing

Based on 9,993 verified pairs across 110 adidas models in the Feetlot database, adidas as a whole leans slightly snug: the typical adidas shoe fits a little tighter in length than the Nike Air Force 1 that Feetlot uses as its reference point. For everyday wear that translates to a fit that is close to true to size on the brand's most popular silhouettes, which matches adidas's long-standing real-world reputation for fitting most people in their normal size.

The more useful finding is about consistency, and this is where Feetlot data tells you something a brand size chart never will. adidas is a low-consistency brand. Sizing varies a lot from one model to the next, with a wide spread between the snuggest and roomiest models in the catalog. In plain terms, knowing your size in one adidas shoe is a weak predictor of your size in another adidas shoe. A pair of Samba OG and a pair of Ultraboost can want different sizes on the same foot. That is why the brand-level verdict matters less for adidas than it does for a tightly consistent brand, and why the model-by-model breakdown below is the part worth reading.

For context on the catalog's most-owned shoes, the Superstar (1,678 pairs) and Stan Smith (950 pairs) both sit almost exactly true to size in the data, while the Gazelle (906 pairs) and NMD R1 (779 pairs) run just slightly on the snug side of neutral. These court classics are the safest bet for ordering your usual size.

Which adidas Shoes Run Big, and Which Run Small

Because adidas is inconsistent, this is the section to bookmark. The pattern in the Feetlot data is largely a category pattern: running and performance shoes tend to fit tighter and call for sizing up, while several heritage and knit-upper models fit roomier and can be sized down.

adidas models that run small (consider sizing up)

The clearest cluster of snug-fitting adidas shoes is its running line. The Ultraboost DNA and the Ultraboost 1.0 both run small enough that most owners go up about half a size, and the heavily owned Ultraboost 4.0 (577 pairs) shows the same snug, sock-like Primeknit fit. The original-era EQT Support 91/18 lands in the same size-up territory. Beyond running, performance categories tell the same story: the Dame 6 basketball shoe and the adipower barricade 7.0 tennis shoe both fit short and reward going up a size. On the lifestyle side, the premium Y-3 Kaiwa is the snuggest model in this group, and the Samba Millennium fits tighter than the classic Samba it is named after.

adidas models that run large (consider sizing down or staying true)

A smaller set of adidas models fits roomy enough to size down, and they skew toward knit and streetwear-leaning silhouettes. The D.O.N. Issue #1 is the roomiest model in this group and the one most worth trying a half size down. The knit-upper NMD R1 Primeknit, the chunky Yung-96, the EQT Support ADV, the Iniki Runner, and the Stan Smith Primeknit all fit at or just past true to size, so true-to-size buyers are safe and anyone between sizes can comfortably take the smaller one.

The true-to-size core

The brand's most iconic court and terrace shoes are the dependable middle. The Superstar, Stan Smith, Gazelle, NMD R1, and Samba OG all measure close to neutral in the Feetlot data, which is why adidas earns its reputation as a true-to-size brand on its bestsellers even though its catalog as a whole is not.

How to Find Your adidas Size

Start with the category, since that is the strongest signal in the adidas data:

• Lifestyle and terrace classics (Superstar, Stan Smith, Gazelle, Samba OG): order your normal size. If you are between sizes or have a wider foot, these leather uppers have little give, so lean to the larger size.
• Running and Boost models (the Ultraboost family, EQT runners): plan to go up about half a size. The Primeknit upper hugs the foot and the toe box is short, so true-to-size buyers often feel cramped.
• Basketball and performance (Dame, barricade): these run short and athletic, so size up and prioritize a locked-in midfoot.
• Knit streetwear (NMD Primeknit, Yung-96, Iniki): these run roomier, so true to size works and between-size buyers can size down.

For width, adidas tends to run medium-to-narrow, especially in the knit running uppers. Wide-footed buyers are usually more comfortable in the leather lifestyle models or going up a half size in the runners rather than chasing a wide variant, which adidas offers on few styles. To measure, stand on a sheet of paper in the evening, trace both feet, measure heel to longest toe in centimeters, use the larger foot, and match it to the chart below rather than guessing from a different brand's size.

adidas vs Other Brands

Against Nike, adidas generally fits a half size larger on comparable lifestyle shoes: the Nike Air Force 1 runs famously long, and most adidas court classics fit a touch trimmer than that but still close to true. Buyers moving from Nike running shoes to the Ultraboost line usually keep the same size or go up slightly, because both brands build snug performance uppers. Compared with New Balance, which many consider one of the more consistently true-to-size and width-friendly brands, adidas is less predictable across its catalog and narrower in most running models. Against Converse and Vans, which are well known for running large and calling for a size down, adidas runs closer to true and rarely needs sizing down outside the roomy knit models noted above. The practical takeaway: do not copy a size straight from another brand into adidas, and especially not across adidas categories.

adidas Size Chart (US / UK / EU)

Standard adidas men's conversions. Women's US sizes typically run about 1.5 sizes above men's at the same foot length. Use this as a starting point, then apply the model-level adjustments above.

How Feetlot Measures This

Feetlot fits a single global offset model to more than 100,000 verified owner-reported shoe records. Each shoe earns a number that captures how its real-world fit drifts from a reference shoe, the Nike Air Force 1. Aggregating those numbers across every adidas model in the database reveals the brand's overall tendency, how consistent it is from model to model, and exactly which shoes break the pattern, which is how the snug runners and roomy knits above were identified rather than guessed. To get a personal recommendation in any specific model, sign in to Feetlot and add the shoes you already own and how they fit. Feetlot then calibrates to your foot and tells you the right size in the adidas model you are considering.