Convert Liang/Tael to troy ounces

Decimalised by reform

The historical liang was one-sixteenth of a jin. The market system reform set the jin at exactly 500 g and, later, made the liang one-tenth of it, so the modern mainland liang is exactly 50 g. That single change is the reason old and new Chinese sources disagree: a pre-reform liang is about 31.25 g, a modern one 50 g.

Below the liang sits the qian (mace) at 5 g and the fen at 0.5 g, both still used in pharmacy and jewellery. The whole ladder is decimal now, which is what made it survivable alongside the metric system.

Everyday Chinese quantity language

Chinese cooking measures by weight, not volume, and the liang is the granularity home cooks use: half a jin of pork, three liang of noodles. Restaurant menus in northern China price dumplings and noodles per liang, and street markets weigh produce in jin with liang as the remainder.

Because the jin is exactly 500 g, the whole system converts trivially — one jin is half a kilogram — which is precisely why Chinese consumers never needed to abandon it. Metrication in China succeeded by absorbing the traditional units rather than replacing them.

Medicine and metals

Traditional Chinese medicine prescriptions are written in liang, qian and fen. Mainland practice uses the 50 g liang; Hong Kong and Taiwanese practice uses the older 37.799 g and 37.5 g taels. A prescription transcribed across that boundary without conversion changes the dose by about a third.

Silver historically circulated as sycee ingots denominated in liang — the "tael of silver" of Qing-era accounts — and those taels varied by treasury and by city (Kuping, Haiguan, Shanghai taels all differed). Historical monetary figures in liang need the specific tael standard, not the modern 50 g.

Reading liang in practice

For any modern mainland source, 50 g is safe and exact. For anything before the mid-twentieth century, or for Hong Kong, Taiwan or overseas Chinese usage, establish the standard first.

When converting recipes, remember that Chinese weights are given as-purchased: three liang of dried noodles is 150 g dry, not cooked. The unit is exact; the culinary assumption around it is the part that travels badly.

Two liang, one character

The mainland liang is exactly 50 grams — one tenth of the 500 gram jin — while the Hong Kong liang follows the sixteen-tael catty and is 37.799 grams. Both are written the same way, and neither is signalled by anything in the number, so the jurisdiction of the document is the only reliable discriminator.

The mainland redefinition also changed the structure, not just the value: ten liang to a jin replaced the traditional sixteen. Steelyard balances graduated in sixteenths therefore cannot be read against mainland figures, which is why traditional shops in Hong Kong and Southeast Asia kept their own scales rather than adopting mainland ones. A converted liang figure should always state which system produced it.

Cooking sources add a third hazard. Older Chinese recipes written before the mainland redefinition use the sixteen-liang jin, so a quantity given in liang in a pre-1959 cookbook is about 31.25 grams rather than 50. Recipes reprinted without adjustment therefore call for substantially more of every ingredient than the author intended.

Common mistakes to avoid

• The modern mainland liang is 50 g; the pre-reform liang was about 31.25 g (one-sixteenth of a jin).
• Hong Kong (37.799 g) and Taiwan (37.5 g) use different taels under the same character — critical in medicine dosing.
• Qing-era silver taels varied by treasury and city; do not apply a modern liang to historical monetary figures.

Questions people ask about the Liang/Tael

How many grams is one liang in China?

Exactly 50 g in mainland China, because ten liang make one 500 g jin under the market system of units.

How many liang are in a jin?

Ten in modern mainland usage. Historically it was sixteen, which is why old sources give a liang of about 31.25 g.

Is a liang the same as a tael?

They are the same word in Chinese and English, but the mainland liang (50 g) differs from the Hong Kong tael (37.799 g) and the Taiwanese tael (37.5 g).