Brand Sizing Variation Analysis

This page compares how selected athletic and casual footwear brands align with standard centimeter-based equivalents. We do not claim proprietary access to brand data; we analyze published size charts and describe variation in plain language. The goal is to explain why the same numeric size can fit differently across brands.

Concept: Variation Offset

We define variation as the difference between a brand’s effective size and a standard CM equivalent:

Offset = S(brand) − S(standard)

In practice: some brands run longer (positive offset for length), some run narrower, and some compress or expand half sizes relative to a standard scale. Brand sizing charts demonstrate these differences when compared to a consistent cm baseline.

Brands Analyzed

We look at published size charts and fit reports for the following brands. All references are to publicly available charts and common fit descriptions.

Nike — Nike sizing charts are widely published. Retail analyses commonly show Nike running and lifestyle shoes often run slightly narrow and sometimes short relative to a standard US/EU conversion; half sizes are offered and matter for fit. See our Nike size guide for conversion and fit notes.
Adidas — Adidas size charts are published for many models. Footwear is frequently cited as running close to standard or slightly long in some lines; width tends to be standard to narrow. Our Adidas size guide summarizes chart-based conversions.
New Balance — New Balance publishes detailed charts and offers multiple widths. Brand sizing charts demonstrate that length can run true to standard or slightly long, with width options (e.g. D, 2E) affecting fit. New Balance size guide.
ASICS — ASICS running charts are publicly available. Industry reports indicate running shoes often run narrow and sometimes short; going up a half size is commonly suggested for wider feet. ASICS size guide.
Converse — Converse size charts show a distinct pattern: many consumers and fit guides suggest sizing down or that Converse runs long relative to standard. Some models compress half sizes (e.g. fewer half-size options). Converse size guide.

How We Use This

We do not invent numbers. We use phrases like “brand sizing charts demonstrate,” “retail analyses commonly show,” and “footwear is frequently cited as” to reflect that our analysis is based on published information and common fit feedback. Our conversion tools use standardized baselines; for brand-specific decisions, we recommend checking the brand’s official size chart and, when possible, measuring your foot in cm.