What Size Am I in H&M? The Complete Sizing Guide

H&M runs true to size or slightly small – but here's where it gets tricky: sizing varies dramatically depending on which collection you're shopping and what style you choose. I've learnt this the hard way after years of grabbing my usual size only to find it either drowning me or cutting off my circulation.

The H&M Collections Problem

Here's what most people don't realise: H&M isn't one brand. It's multiple collections under one roof, and they all fit completely differently. I discovered this after buying two "size 12" tops on the same day – one was baggy, the other couldn't zip.

The main collections you'll encounter:

H&M Conscious – Tends to run smaller, especially in structured pieces
Divided – Their younger range, generally more generous and relaxed
Trend pieces – Inconsistent sizing, often cut slimmer to match runway proportions
Premium Quality – Usually true to size with better tailoring

This is why you can wear three different sizes in one shopping trip. It's not you – it's them.

What Actually Fits True to Size

After countless fitting room disasters, here's what I've found works:

Skirts – Surprisingly consistent. If you're normally a UK 12, grab a 12. Their A-line and midi skirts are particularly reliable.

Knitwear – Generally true to size unless marked "oversized". Their fine-gauge jumpers fit as expected, though watch the length if you're petite.

Dresses (jersey) – The stretchy casual dresses are forgiving and run true to size. Structured dresses? Size up.

Where H&M Runs Small

This is where it gets frustrating:

Tops & Blouses – Run small through the bust and shoulders. I always size up in anything fitted or with buttons. Those cute pussy-bow blouses? Definitely need a size larger if you're fuller in the chest.

Trousers – Notoriously tight, especially across the hips and thighs. A BuzzFeed investigation actually found that H&M's size 14 measured smaller than a size 12 at both ASOS and Zara. That's shocking.

Jeans – Hit or miss. The stretchy denim is more forgiving, but their rigid denim runs incredibly small. I'm talking two sizes up territory.

Tailored Blazers – Cut slim with narrow shoulders. Size up if you want to layer anything underneath.

How H&M Compares to Other Brands

If you shop at multiple high street stores, here's the comparison:

H&M runs larger than Zara (Zara is notoriously fitted)
H&M runs smaller than M&S, ASOS, and Next
Similar sizing to Mango, though Mango is narrower through the hips
H&M runs smaller than Boden and White Stuff
More generous than Massimo Dutti and Reiss

My Honest Shopping Strategy

I never just grab my usual size anymore. Here's what actually works:

Check the measurements in each product description – H&M provides these for every item
Read the reviews – people will tell you if it runs small
If ordering online, I size up in anything fitted
For basics like T-shirts, my usual size works
Anything structured or tailored? Go up a size

Where to Shop If H&M Sizing Frustrates You

If you're fed up with H&M's inconsistency, here are alternatives with better sizing reliability:

High Street Options:

COS – More consistent sizing with a similar minimalist aesthetic. Their pieces run true to size and the quality is noticeably better.

Whistles – Contemporary style with reliable sizing. More expensive than H&M but you'll actually know what size you need.

Jigsaw – Classic pieces that fit consistently. Their trousers are particularly well-cut for different body shapes.

& Other Stories (H&M's sister brand) – Similar price point but more consistent sizing and better fabric quality.

Anthropologie – For those boho pieces H&M tries to copy. Sizing runs true with detailed measurements provided.

Premium Options:

Me&Em – Investment pieces with impeccable fit. Their size guide is accurate and customer service will help you choose.

Hobbs – Workwear and occasionwear that fits like a dream. Consistent sizing across all collections.

Independent Brands Worth Discovering:

Kitri – London-based brand with playful prints and reliable sizing. Their dresses are Instagram famous for good reason.

Rixo – Vintage-inspired pieces with consistent sizing. Their size guide is spot-on and they cater to UK 6-18.

The Ultimate Solution: Never Guess Your Size Again

Here's the thing – you shouldn't have to play sizing roulette every time you shop. That's exactly why we created Tellar.co.uk.

Tellar is the UK's leading sizing tool that matches your body to over 1,500 brands instantly. Measure yourself once using bust, waist, and hip measurements (or input your size from a brand that fits you perfectly), and you'll never need to look at another confusing size chart again.

Here's how it works:

Use our Store Size Lookup tool to find your precise size in H&M, COS, Reiss, and 1,500+ other brands
It's completely free – no downloads, no subscriptions, works straight in your browser
Get your size before you buy, avoiding returns and wardrobe regrets
Compare how you fit across different brands in seconds

Plus, explore the Tellar Fashion Hub – a library packed with honest, unbiased style advice from professional stylists. We cover everything from jean trends for 2026 to the ultimate guide to jackets. All free, always independent.

Want to understand sizing better? Check out our Ultimate Clothing Sizing Guide for everything you need to know about finding your perfect fit across all brands.

The Bottom Line on H&M Sizing

H&M's sizing is frustrating because there's simply no consistency between collections. You genuinely need to check measurements for each individual item rather than relying on your usual size. Their quality and trend-led pieces are brilliant for the price, but the sizing lottery is real.

My advice? Always read the product measurements, size up in anything fitted or tailored, and use Tellar to take the guesswork out entirely. You'll save time, money, and the headache of returns.

Shopping should be enjoyable, not a maths equation. With the right tools and knowledge, you can navigate H&M's sizing chaos and come out with pieces you'll actually wear.