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
Frequently asked questions
Is SizeSwapper free to use?
Yes, completely. There's no sign-up, no paywall, and no limit on how many conversions you can run.
Do I need to create an account?
No. SizeSwapper works entirely without an account. If you want to keep a result for later, use the "save conversion" or "copy link" buttons instead.
How accurate are the size conversions?
As accurate as each brand's own published size chart allows. We show a confidence rating per brand so you know whether a result is a close, reliable match or a rougher starting guide. See our methodology page for details.
Why does one brand show a stronger result than another?
Some brands publish very consistent measurements across their whole range; others vary by category or supplier. We rate each brand's consistency so the confidence shown reflects the underlying data quality, not a guess.
Does SizeSwapper store my body measurements?
No. Measurements you type in are used only to calculate your result on the page and are never saved, shared in links, or sent anywhere. See our privacy policy for full details.
Can I compare sizes without knowing my measurements?
Yes. If you already know your size in one brand, enter that brand and size and we'll convert it to your target brand directly — no measuring required.
What if my brand or a specific comparison isn't listed?
Use the "request a brand or comparison" option in the converter. We're adding coverage regularly and prioritise requests with genuine demand.
Why is a result shown as "between sizes"?
When your measurements sit close to two different sizes in the target brand, we show both options and explain which runs closer to your measurements and which gives you more room, rather than forcing a single guess.
Does SizeSwapper work on mobile?
Yes, the whole tool is designed mobile-first and works the same way on phones, tablets, and desktop.
I think a size chart is wrong or outdated. What do I do?
Use the "report an issue" link shown with every result. We check brand size guides periodically, but if a brand has updated their chart since our last check, let us know and we'll review it.