Asian Size to US Size: The Seller’s Conversion Guide (2026 Charts + Tolerance Rules)

Most size guides tell you to “add one or two sizes.” That advice is what fills your returns shelf. Asian garments are not just smaller — they are cut to a different shape. This guide gives you the real charts, the factory tolerance numbers, and the listing fixes that actually cut returns.

Alan Xiao Founder of Sourcing Pioneer

· Updated Aug 18, 2026 · 14 min read

Why “just add two sizes” fails

Apparel has the worst return rate in e-commerce. Industry data for 2026 puts clothing returns at 20–40%, against about 20% for online retail overall. Fit is the number one reason.

So sellers reach for a simple rule: Asian sizes run small, add two. It sounds right. It fails because it only fixes one of three problems.

Sizing up solves problem 1 and ignores problems 2 and 3. That is why the complaints keep coming even after you “fixed” the chart.

How Chinese size labels actually work

Chinese garments follow a national standard called GB/T 1335. The label looks like a fraction:

The letter at the end is the body type. It tells you the drop — the gap between chest and waist:

This system is more precise than US alpha sizing, because it states real body numbers instead of a letter. The catch: it describes the body, not the finished garment. Two factories can cut very different shirts for the same 165/88A body.

The conversion charts

Use these as a starting point, then confirm with the flat measurements from your own sample. Every table below gives body measurements in both inches and centimetres.

Women’s tops and jackets

The shoulder column is the one to watch. Bust width can be forgiving on a knit top; shoulder width cannot. If your sample’s shoulder seam is more than 2 cm narrower than the US equivalent, the garment will feel tight no matter what the bust says.

Women’s bottoms and dresses

Men’s tops and shirts

Shoes — convert from millimetres

Chinese footwear is graded by foot length in millimetres. That number is stable across factories, unlike the printed size. Always ask for the mm value.

Asian shoe lasts have a wider toe box and a higher arch than US and European lasts. A customer with narrow feet who orders by length alone will find the shoe loose across the front. Say so on the listing.

Kids’ clothing — height, not age

Asian kidswear is sized by the child’s height in centimetres. US kidswear is sized by age. Age is a poor proxy — two eight-year-olds can differ by 15 cm. List the height range on every kids’ product page and returns drop immediately.

Bras

Cup letters match up to D. Above D the systems split: China continues E, F, G while the US switches to DD, DDD. This single gap causes a large share of lingerie returns.

How to measure a sample in 10 minutes

Flat measurement is the only number you can defend to a customer. Lay the garment on a flat table, smooth it out, close all buttons and zips, and do not stretch the fabric.

Factory tolerance: the number nobody tells you

This is the part missing from every consumer size guide, and it is where sellers lose money.

Chinese apparel factories work to a production tolerance — an accepted margin of error on every measurement. Standard practice is ±2–3 cm. Nobody mentions it unless you ask.

Do the arithmetic. If your approved sample has a 96 cm chest and the factory works to ±3 cm, your bulk order can legitimately ship anywhere from 93 cm to 99 cm. That 6 cm spread is a full size grade. Your customers receive garments labelled “L” that range from a snug M to a loose XL — and every complaint is technically within spec.

Write the tolerance into your purchase order. Reasonable, achievable numbers:

Listing fixes that actually cut returns

1. Publish numbers, not letters

Never upload the factory’s size image straight to your product page. Build your own chart from your own measurements, in both inches and centimetres. US shoppers think in inches; your factory works in centimetres. Show both and neither side has to convert.

2. Add a model reference line

One sentence under the chart does more than the chart itself:

This works because shoppers compare themselves to a person, not to a table. It costs nothing to add.

3. State the cut in plain words

Tell the buyer which shape they are getting, before they order:

• Asian slim cut: “Cut close to the body. If you prefer a relaxed fit, order one size up.”
• US-adjusted cut: “Standard US relaxed fit. Order your usual size.”

4. Kill “One Size”

Most Asian “free size” or “one size” garments fit roughly 155–165 cm frames, which is around US S–M. If you must list them, publish the flat bust and waist numbers and state the height range. A shopper who knows it will not fit simply does not order — and a lost sale is far cheaper than a return.

5. Ask the factory to print dual labels

For private label orders, have the inner label carry both the US alpha size and the cm measurements. Cost is a few cents per piece. It removes the single most common post-delivery complaint: “the tag says L but it fits like a small.”

Five mistakes that cost real money

The last one catches experienced sellers. A factory changes fabric supplier or re-draws a pattern to save material, and your second production run fits differently from the first — with identical labels. Measure every run.

Frequently asked questions