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There’s no single ‘AliExpress size’ — every listing sets its own chart
Unlike a single retailer with one house sizing standard, AliExpress hosts many independent sellers, and a Reddit thread on the platform’s own size-chart confusion reflects the buyer-community consensus: take your own chest, waist, length and arm measurements in centimeters, then compare them to that specific store’s own size chart, not a general conversion table. The chart is almost always a separate image on the listing page, not a standardized field, so it’s easy to skip past it and rely on the S/M/L label alone.
Why Chinese sizing tends to run smaller
A sourcing/fulfillment guide summarizes the common explanation: Chinese clothing and footwear sizing is generally built around East Asian body-proportion averages, which this source describes as slimmer through the torso, narrower in the shoulders and shorter in the arms and legs than Western sizing averages, and treats this as a design-standard difference rather than simply “smaller numbers.” The same source’s rough size-label mapping, offered as an approximation rather than a fixed conversion:
| Chinese label | Roughly equivalent US size | Caveat |
|---|---|---|
| M | US XS | Approximate; varies by seller and garment cut |
| L | US S | Approximate |
| XL | US M | Approximate |
| XXL | US L | Approximate |
Treat this table as a rough starting expectation, not a rule to apply to every listing; the whole point of the centimeter-measurement approach below is that it replaces guesses like this with the actual listing’s own numbers.
Body measurements vs. garment measurements: a critical distinction
A body measurement describes who the garment is designed to fit (for example “fits a 96-100cm chest”). A garment measurement is the actual item’s own dimensions, laid flat and measured directly. A sourcing guide flags this distinction as one of the most common sources of confusion: a size chart giving body measurements assumes some built-in ease (extra room), while a chart giving flat garment measurements doesn’t, so the same number can imply a different actual fit depending on which one a listing is showing you. If a listing’s chart doesn’t say which type it is, treat the numbers as approximate rather than exact.
How to measure yourself for clothing
- Use a soft tailor’s tape measure, over thin clothing rather than a thick sweater.
- Bust/chest: wrap the tape around the fullest part of your chest, keeping it horizontal.
- Waist: measure around your natural waistline, the narrowest part of your torso, roughly 2-3cm above your belly button.
- Hips: wrap the tape around the widest part of your hips and seat.
- Write every number down in centimeters, then compare against the specific listing’s own chart, not the S/M/L label.
The ‘Free Size’ (均码) trap
“Free Size” (均码) on Chinese shopping platforms means the garment comes in exactly one size, not that it fits everyone. A sourcing guide’s own estimate puts a typical Free Size item’s actual fit at roughly an 80-88cm bust (about a US XS to M), so anyone above a US Medium is likely to find a Free Size item too small regardless of how it’s marketed.
Decoding a Chinese size tag like ‘160/84A’
Some listings or received garments carry a numeric code rather than a letter. Per China’s national clothing-size standard (GB/T 1335), the first number is the wearer’s intended height in centimeters, the second is the intended bust or waist measurement in centimeters, and the letter indicates body shape (A for a standard build, B for fuller, Y for slimmer). So “160/84A” targets someone around 160cm tall with an 84cm bust and an average build, which a sourcing guide estimates as roughly a Chinese Medium or a US 4-6, though this is again an approximation, not a fixed rule.
Shoes: two different Chinese sizing systems
Shoe sizing has its own, separate complication. China has historically used two different numbering systems, and a shoe-sizing guide citing China’s national standard (GB/T 3293.1) and the international Mondopoint system (ISO 9407) explains both:
- The ‘Old’ Chinese system uses numbers like 38, 39, 40 that superficially resemble EU sizes but aren’t calculated the same way.
- The ‘New’ (Mondopoint) system uses your actual foot length in millimeters directly as the size number (for example 250, 260, 270).
- The two systems only roughly line up with EU sizing around a 250mm foot (about EU/CN 40). Above that, the gap widens quickly; the same guide’s own example puts an Old Chinese size 44 at a 270mm foot, while a genuine EU 44 fits a 280mm foot, a 10mm difference.
The reliable fix, per the same guide, is to measure your actual foot length rather than trust the label:
- Stand on a sheet of paper against a wall, wearing your normal socks.
- Mark your longest toe and the back of your heel.
- Measure the distance between the marks in millimeters.
- Measure both feet and use the longer measurement.
- Add roughly 5-10mm of comfort room, then match that number to the listing’s own foot-length chart if it provides one.
Red flags in a listing’s own size chart
- The chart only shows letters (S/M/L/XL) with no centimeter or millimeter numbers. For shoes especially, a shoe-sizing guide calls this a clear red flag, since a real fit needs a foot-length number, not just a letter.
- Every row shows the Chinese size and the EU size as identical numbers, all the way down the chart. The same guide flags this as a sign the numbers may have been copied without actually converting them, since Old Chinese and EU sizes only align closely around one point (roughly a 250mm foot) and diverge elsewhere.
- No foot length in mm or cm anywhere on a shoe listing. China’s own national standard is built around foot length, so a listing that omits it entirely is skipping the one number that actually matters.
- Many reviews specifically say ‘runs small’ or ‘runs big.’ If you’re unsure, the same guide’s suggestion is to message the seller for the exact insole length in centimeters before you order.
If it doesn’t fit anyway
Even careful measuring can still miss, since cut and stated measurements vary seller to seller. Check the listing’s own return policy before you buy, and keep your order and any size-chart screenshots in case you need to raise a dispute. What AliExpress Buyer Protection covers.
Common mistakes
- Ordering your usual home-country size label instead of comparing your own cm measurements to the listing’s own chart.
- Assuming ‘Free Size’ fits everyone, when it’s really a single fixed size that suits a narrower range than the name implies.
- Confusing body measurements with garment measurements on a chart that doesn’t specify which it’s showing.
- Trusting a shoe chart with no foot-length number, or one where Chinese and EU sizes look suspiciously identical all the way through.
- Not reading recent reviews for fit-specific comments before ordering something you can’t easily size up or down.
Before you buy: size chart checklist
- ☐ I’ve measured myself in centimeters rather than assuming my usual home-country size label applies.
- ☐ I’ve compared my measurements to this specific listing’s own size chart, not a general conversion table.
- ☐ For clothing, I’ve checked whether the chart shows body measurements or garment measurements.
- ☐ For shoes, I’ve measured my actual foot length in mm rather than trusting the size label alone.
- ☐ I’ve read recent reviews for fit-specific comments (“runs small”, “runs big”).
- ☐ I’ve checked the listing’s return policy before ordering, in case the fit is still off.
Ready to shop?
Once you’ve measured yourself, open the listing on AliExpress and compare your numbers to that store’s own size chart before you choose an option. Search AliExpress for a second listing of the same item to compare charts, and check the current price once you’ve picked the size that actually matches your measurements.
Where to go next
- AliExpress product specifications: which numbers actually matter
- AliExpress product red flags to watch for
- AliExpress Buyer Protection: what’s covered before you pay
- AliExpress trusted sellers: the seven checks that matter
Frequently asked questions
Is there one standard AliExpress size chart?
No. Each seller sets its own size chart for its own listings, usually as an image, so the same letter label can mean a different actual measurement from one store to the next. Always check the specific listing’s own chart.
Why do Chinese sizes run smaller than US or EU sizes?
Sourcing guides attribute this to Chinese clothing and footwear being designed around East Asian body-proportion averages, generally slimmer through the torso and narrower in the shoulders than Western sizing assumes, rather than simply using smaller numbers for the same fit.
What does ‘Free Size’ mean on a listing?
It means the garment comes in only one size, not that it fits everyone. Estimates put a typical Free Size item’s actual fit around a US XS to M equivalent, so it’s likely too small for anyone above a US Medium.
How do I find my real shoe size on AliExpress?
Measure your actual foot length in millimeters (heel to longest toe, standing on paper), add roughly 5-10mm of comfort room, and match that number to the listing’s own foot-length chart if it provides one, rather than trusting a size label that may use either of China’s two different numbering systems.
What if the item still doesn’t fit when it arrives?
Check the listing’s own return policy before you order, and keep your size-chart screenshots and order details in case you need to raise a dispute through AliExpress Buyer Protection.
The bottom line
Skip the letter label and measure yourself in centimeters first, then compare those numbers against the specific listing’s own size chart, not a general conversion table. For shoes, measure your actual foot length rather than trusting a size number that could belong to either of China’s two different sizing systems.
Check current prices on AliExpress →
Sources
- Reddit r/Aliexpress: Help on AliExpress size charts (buyer-community measuring advice)
- DailyFulfill: Chinese Size Chart: US, EU & UK Conversion (clothing/shoe/ring overview; sourcing/fulfillment vendor)
- DailyFulfill: Chinese Shoe Size to US/EU/UK Size Chart (Old vs. New/Mondopoint systems, citing GB/T 3293.1 and ISO 9407)
- DailyFulfill: Exact Chinese Clothing Size Charts Guide (160/84A tag system, citing GB/T 1335; Free Size explanation)
- AliExpress: Buyer Protection
Sizing varies seller to seller and cut to cut. Treat every chart and conversion table here as a starting estimate, and always check the specific listing’s own chart and recent reviews before you order.
