Do Nike Shoes Run Big or Small?

What the Feetlot Data Says About Nike Sizing

The Feetlot database holds 36,578 verified owner-reported pairs across 200 Nike models, which makes Nike one of the most heavily measured brands on the platform. That depth matters here, because the single most important finding about Nike sizing is not a direction. It is the inconsistency.

Nike sizing consistency rates LOW in Feetlot data. It is one of the least consistent brands measured, meaning the fit drifts a lot from one model to the next. Some Nike silhouettes run roughly half a size large, others run roughly half a size small, and they sit under the same Swoosh in the same box with the same number printed inside. A single rule like "Nike runs small, always size up" does not hold, and that is exactly the advice most generic blogs still give. The honest takeaway from the data is that the brand-level answer is close to true to size on average, but the model-level answer is the one worth trusting.

Historically Nike had a reputation for running small, which is where the old "size up in Nike" habit comes from. Across the modern catalog that reputation has softened, and the typical Nike shoe now lands close to true to size. The spread around that average is wide, though, and Feetlot data makes the spread visible instead of hiding it behind one verdict.

Which Nike Shoes Run Big, and Which Run Small

Feetlot measures every model against a single reference shoe, the Nike Air Force 1, which is the most-owned Nike pair in the database with 13,837 logged pairs. The Air Force 1 itself runs about half a size large, so it is a useful anchor: models that fit as roomy as the Air Force 1 effectively run large, and models that fit noticeably tighter than it run small. The pattern below is grouped by category, because in Nike the category predicts the fit better than anything else.

Nike models that run large (order true to size or go down half a size)

Nike's lifestyle and court shoes cluster at the brand's roomy end. The Air Force 1 leads the group and runs about half a size large, and its variants behave almost identically: the Air Force 1 Mid, the Air Force 1 Low Utility, and the Air Force 1 Flyknit Low all sit right alongside the standard Air Force 1, just a hair more fitted. The Blazer Low is another roomy court shoe in this group, fitting nearly as generous as the Air Force 1. The SB Dunk Low rounds out the large-fitting court and skate lineup. For all of these, most owners are best served ordering their true size, and people who like a snug fit can go down half a size.

Nike models that run small (go up about half a size)

Nike's running and basketball shoes are the opposite story, and this is where the brand's old small-fitting reputation still lives. The Kyrie 6 runs the smallest of any Nike model in this list, fitting close to a full size tighter than the Air Force 1, so basketball players should size up confidently. The Air Huarache is the snuggest of the lifestyle runners thanks to its tight neoprene bootie and runs well over half a size small. The retro Cortez runs small with a narrow last, and the Free 3.0 v4 runs small as well, as flexible minimalist runners tend to.

The Air Max family runs small with remarkable agreement across its members. The Air Max 97 and Air Max 95 both run a little under half a size small and are among the most-measured runners in the data, so that read is reliable. The Air Max Plus (the TN) runs small to a similar degree, and so do the Air Max 270 and the Air Max Vapormax Flyknit. Going up half a size is the safe call across the Air Max line.

Two more basketball and budget picks follow the same size-up rule. The Hyperdunk runs small like most performance basketball models. On the value end, the Tanjun and the Revolution are thin textile trainers that run snug and narrow, so half a size up gives them breathing room. The Blazer Mid is the interesting exception inside the retro court group: unlike the roomy Blazer Low, the Mid runs slightly small, which is a good example of why the model, and even the specific cut of a model, beats any brand-wide rule in Nike.

How to Find Your Nike Size

Because Nike is so model-dependent, the most reliable approach is to size by category rather than by brand:

• Lifestyle and court (Air Force 1, Blazer Low, Dunk): order your true size. If you prefer a tight fit or have narrow feet, go down half a size.
• Running (Air Max, Free, Vapormax, Huarache, Cortez, Pegasus): go up half a size from your true size, especially if you wear thicker socks or run in them.
• Basketball (Kyrie, Hyperdunk): go up half a size, and consider a full size up in the snuggest models if you want toe room for lateral movement.
• Budget textile trainers (Tanjun, Revolution): go up half a size, because the thin uppers run both short and narrow.

Wide feet: Nike tends to run narrow across most lines, the running and budget models especially. Look for Nike's Wide (2E) or Extra Wide (4E) widths where offered, or favor the roomier lifestyle silhouettes like the Air Force 1, which has more volume in the toe box than a knit runner.

Narrow feet: the snug runners and basketball models will lock the foot down well, and you can usually skip sizing up on the lifestyle shoes.

Measure first: stand on a sheet of paper late in the day, trace both feet, measure heel to longest toe in centimeters, and size to the larger foot. Then apply the category rule above. Measuring removes most of the guesswork that brand-level advice leaves behind.

Nike vs Other Brands

Compared with its main rivals, Nike sits roughly in the middle for overall fit but toward the high end for variability. Adidas is generally regarded as the more consistent of the two big sportswear brands and tends to run slightly long in many lifestyle and running models, so people moving from Nike running shoes to Adidas often find they need a touch less length. New Balance is widely seen as true to size and is the go-to for wide feet because of its broad width range, which is where Nike is weakest. Converse and Vans both run large and are commonly bought half a size down, more generous than most Nike models. Within Nike's own house, Jordan Brand lifestyle models tend to track close to the Air Force 1 end, fitting fairly true to slightly large. The practical summary: Nike is not reliably bigger or smaller than the field, but it is less predictable, so the per-model check matters more for Nike than for most brands.

Nike Size Chart (US / UK / EU)

Use this as a starting conversion, then apply the category sizing rule for the specific model. Sizes are for men's US unless noted.

How Feetlot Measures This

Feetlot fits a global offset model to more than 100,000 verified owner-reported shoe records. Each shoe earns a single number that captures how its fit drifts from a reference shoe, the Nike Air Force 1. Aggregating those numbers across every model in a brand reveals the brand's central tendency, how tightly its models agree, and which models break the pattern. That is how Feetlot can say, with data rather than guesswork, that Nike's lifestyle shoes cluster large while its runners cluster small, and that the brand as a whole is unusually inconsistent. Sign in and add the Nike shoes already owned, and Feetlot will translate that history into a personalized size recommendation for any model in the catalog.