What Size Am I? Here’s How to Find Out (For Every Brand)

Ever feel like every clothing brand has its own secret code for sizing? You’re a 10 at Zara, an 8 at H&M, and somehow both a small and large at ASOS. It’s frustrating, confusing, and enough to make anyone want to give up on online shopping altogether.

At Tellar, we’ve been there. That’s why we created a free tool that makes sizing simple across over 1,500 brands. Whether you shop at high street favourites or niche labels, this is how to finally know your size — and get it right every time.

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Why Clothing Sizes Make No Sense

Let’s get this out of the way: if you’ve ever struggled with sizing, it’s not your body — it’s the system.

There’s no universal standard for clothing sizes. The UK, US, and EU all use different number systems. And brands? They change their sizing charts all the time. Some add stretch. Others use vanity sizing to flatter you into thinking you’re a size smaller than you are.

Even within a single brand, sizing can change from season to season. It’s a total mess.

That’s why guessing doesn’t work. To get your perfect fit, you need a better approach — one that starts with you.

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Your 3 Key Measurements (And Why They Matter)

To finally take control of sizing, all you need are three numbers:

• Bust – measured around the fullest part of your chest

• Waist – the narrowest part of your torso, usually just above the belly button

• Hips – the widest part of your lower body, around your bum and hips

Grab a soft tape measure, or use a string and a ruler if you’re improvising. Take these three measurements in either cm or inches, whichever you prefer.

Once you have them, you can accurately compare your body to any brand’s sizing.

The easiest way to do that? Use Tellar.co.uk.

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Let Tellar Match You to 1,500+ Brands Instantly

We’ve done the hard work for you. At Tellar, we’ve built a database of sizing charts from over 1,500 clothing brands — from Zara to COS, H&M, ASOS, and everything in between.

All you have to do is:

1. Create a free profile at https://tellar.co.uk/create-your-profile

2. Enter your bust, waist, and hip measurements (or choose inches/cm)

3. Head to the Store Size Lookup and search for the brand you want

We’ll instantly tell you what size fits your body best — based on that store’s actual measurements. No more guessing. No more frustration.

You can also log in anytime to update your profile or see size results again at https://tellar.co.uk/log-in-page/.

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Size Conversion? We’ve Got You Covered

Here’s a common problem: you know you’re a UK 10, but you’re shopping a US brand. Or worse — a European one.

Here’s a quick conversion table:

But remember, these are just ballpark. Brands often deviate from these, which is why Tellar’s Size Lookup Tool is a game-changer — it checks the actual chart used by the brand, not just a rough guess.

Want the full charts? Visit our Size Conversion Guide.

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What About Brands That Run Big or Small?

You’ve probably noticed that some brands just don’t fit like others. That’s because they don’t!

We’ve compiled brand-specific sizing advice too, like:

• Zara Size Guide – Zara typically runs small, especially in dresses and trousers

• ASOS Size Guide – Varies a lot depending on the sub-brand (ASOS DESIGN, COLLUSION, etc.)

• H&M Size Guide – Inconsistent sizing across categories, from oversized basics to tight jeans

With Tellar, we tell you before you buy if that brand runs large, small, or true to size — so you can shop with confidence.

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Between Sizes? Here’s What to Do

If you land between two sizes, it’s all about the style and the fabric:

• If the item is fitted or rigid, size up

• If it’s stretchy or oversized, size down for a neater look

• Still unsure? Our recommendations always factor in fabric stretch and fit type, so you don’t have to overthink it

You can also add a known store and size when creating your profile — for example, “Size 10 at Zara” — and we’ll use that as a base. Try it here: https://tellar.co.uk/create-your-profile

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Choose CM or Inches — It’s Up to You

At Tellar, we let you choose your preferred unit right inside the profile setup. Want cm? Great. Prefer inches? That works too. Just tap to toggle, and we’ll automatically display your measurements in that unit across all brands.

See it in action on the profile page or log-in page.

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Skip the Charts. Use the App.

Tellar is now available as an app — so you can carry your size with you wherever you shop.

Get instant recommendations for any brand, on any site, with a few taps. No more screenshots, guesswork, or embarrassing returns.

➡️ Download the Tellar app today at https://tellar.co.uk/app and take the stress out of shopping.

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Summary: The Right Size, Every Time

To find your perfect size across every brand:

1. Take your bust, waist, and hip measurements

2. Create a free profile at https://tellar.co.uk/create-your-profile

3. Use the Store Size Lookup Tool to check your best fit

4. Download the Tellar App from https://tellar.co.uk/app

5. Enjoy sizing that actually works.

No more wasted money. No more returns. Just clothes that fit — first time.