Clothing and shoe size converter for AU, UK, US, CA and EU
Find your best clothing and shoe size match before you buy. SizeSwapper compares official brand size guides, AU, UK, US, CA and EU sizing, and your own measurements — the strongest fit guidance available, short of trying it on. Get a confidence rating and between-size advice, so you shop faster with less guesswork and fewer wrong-size returns.
Popular examples- AU 12 → US 8
- Zara M → ASOS 10
- EU 39 → US 8
- Between sizes? We guide you to tighter or roomier fits
How the SizeSwapper clothing and shoe size converter works
SizeSwapper uses international size systems and official brand size guides to suggest the closest available fit match. You can convert AU, UK, US, CA and EU size labels, compare one brand against another, or enter your own body or foot measurements.
Fit is not one-size-fits-all. Style, fabric, cut, collection and product line can all change how a size feels, especially for brands with multiple suppliers or more variable sizing.
That is why each result includes a confidence rating. For brand-to-brand conversions, SizeSwapper also flags when you may be between sizes and shows both options, so you can choose between a closer fit and a more relaxed fit.
Privacy-friendly by design: your measurements stay on your device and are used only to calculate your result. We do not store your body measurements on our servers, and you do not need an account to use the converter.
Data last checked: June 2026.
Frequently asked questions
How do I convert clothing sizes between brands?
Choose "Brand & size," select the brand and size that already fits you, then pick the brand you're shopping. SizeSwapper compares each brand's official measurement chart directly and shows the closest matching size, rather than assuming a label like "size 12" means the same thing everywhere.
How do I convert sizes between AU, UK, US, CA and EU?
Use "Size by region" for a general regional conversion with no specific brand involved — for example, AU 10 to US size, or UK to EU. You can convert in any direction. If you're shopping a specific brand, "Brand & size" gives a more accurate result, since individual brands often run differently from the general regional standard.
Is SizeSwapper accurate?
As accurate as the published data allows. Each brand shows a confidence rating based on how consistently that brand sizes across its range — some brands are very consistent, others vary by category or collection. SizeSwapper shows you which is which rather than presenting every result as an equally reliable fact. See the methodology page for details.
Which brands does SizeSwapper support?
SizeSwapper currently covers 48 brands, including Zara, ASOS, COS, across tops, dresses, bottoms, and shoes. The full list is on the brands page, and you can request a brand that isn't covered yet directly from the converter.
Do I need to enter my measurements?
No. If you already know your size in one brand, SizeSwapper converts it directly without needing measurements. If you'd rather get a result based on your own bust, waist, hip, or foot measurements, switch to "Measurements" mode instead.
Is SizeSwapper free?
Yes, completely free, with no account or sign-up required.