Free tool · 10 brands · built on official charts
What size am I in every brand?
Enter your measurements to see the size you wear in H&M, Zara, Uniqlo, ASOS, Nike, adidas, Lululemon, Shein, Boohoo and Gap — or pick a size you already know in one brand and instantly convert it to the others.
Sizes aren't standardised between brands — results are a starting point, not a guarantee. To see the actual fit on your body, try the look on virtually.
How to measure yourself
Chest / bust
Tape around the fullest part, level under the arms and across the shoulder blades. Drives tops & dresses.
Waist
Tape around the narrowest part of your natural waist, snug and level. Drives trousers, jeans & skirts.
Hip
Tape around the fullest part of your hips and seat. Useful to cross-check bottoms when waist and hip disagree.
Keep the tape firm but not tight, and measure over light clothing or skin. Not sure which way a brand runs, or stuck between two sizes? Read does it fit me? for how to read a size chart and why the same label varies. Buying shoes too? The shoe size converter and shoe size recommender do the same for footwear (EU / US / UK / cm).
Brand size charts in centimetres
The body measurements behind the converter. Chest/bust drives tops and dresses; waist (with hip as a cross-check) drives bottoms. Values are representative body measurements published by each brand — see Sources.
Why the same size fits differently in every brand
There is no legal or industry standard that says what a "medium" must measure. Each brand chooses its own fit model and its own body-measurement ranges, then prints a letter on the label. The result: a men's M chest can sit anywhere from about 96 cm at H&M to 100–104 cm at Nike, and a women's M bust ranges by roughly 8–12 cm across the brands in this tool. Add vanity sizing — labelling a garment smaller than it really is, so the shopper feels good — and the letter on the tag becomes almost meaningless on its own.
That's the whole point of comparing the centimetres, not the letters. Your chest, waist and hips don't change between websites; only each brand's mapping of those numbers to a size does. This converter does that mapping for you. For the questions a number still can't answer — how does it actually drape and look on me? — see the garment on your own body with generative-AI virtual try-on, or learn how try-on works.
Frequently asked questions
How do I know what size I am in different clothing brands?
Measure your chest/bust (tops) and waist (bottoms) in centimetres, then enter the number above. The tool compares it against each brand's size chart and shows the size to start with in all ten brands. The same body is often an M in one brand and an L in another — that's normal.
If I'm a medium in one brand, what size am I in another?
Switch to "Convert my size", pick the brand and size you know, and the tool maps it to a body measurement, then finds the closest size in every other brand. A Zara M lands near a Boohoo M (UK 12) and an H&M M, for instance.
Why is the same size different in every brand?
Letter sizes aren't standardised. Each brand uses its own fit model and measurement ranges, and vanity sizing shifts labels, so a "medium" can vary by 8–12 cm. The centimetres are the reliable thing to compare, not the letter.
Are these size charts accurate?
They're built from each brand's own size guide where available, otherwise reputable aggregators (noted in Sources). They're body — not garment — measurements, and fit varies by product (slim, oversized, tall). Use the result as a strong starting point, confirm on the brand's chart for the specific item, or check fit with virtual try-on.
Sources
Each brand's measurements come from its official size guide where that was accessible, or a reputable aggregator/retailer where it wasn't (marked below). Links checked June 2026. Brands update their charts periodically — if a number looks off, the brand's own current guide is the final word.