21 units across 5 measurement systems — metric, imperial, Chinese & precious metals
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| Unit | Symbol | System | 1 Unit = (in grams) |
|---|---|---|---|
| Tonne (metric ton) | t | Metric (SI) | 1,000,000 |
| Kilogram | kg | Metric (SI base) | 1,000 |
| Gram | g | Metric | 1 |
| Milligram | mg | Metric | 0.001 |
| Microgram | µg | Metric | 0.000001 |
| 斤 (Jin / Catty) | 市斤 | Chinese Traditional (PRC) | 500 |
| 两 (Liang / Tael) | 市两 | Chinese Traditional (PRC) | 50 |
| 钱 (Qian / Mace) | 市钱 | Chinese Traditional (PRC) | 5 |
| 台斤 (Taiwan Jin) | 台斤 | Taiwan Regional | 600 |
| 港斤 (HK Catty) | 港斤 | Hong Kong / SE Asia | 604.79 |
| Stone | st | Imperial (UK/Ireland) | 6,350.293 |
| Pound | lb | Imperial / US Customary | 453.592 |
| Ounce | oz | Imperial / US Customary | 28.3495 |
| Dram | dr | Imperial / US Customary | 1.7718 |
| Grain | gr | Imperial / US Customary | 0.0648 |
| Troy Ounce | oz t | Precious Metals | 31.1035 |
| Troy Pound | lb t | Precious Metals | 373.242 |
| Carat | ct | Gemstones | 0.2 |
| Long Ton (UK) | long tn | Imperial | 1,016,047 |
| Short Ton (US) | sh tn | US Customary | 907,185 |
| Hundredweight (US) | cwt | US Customary | 45,359.2 |
The PRC Jin (市斤) = 500 grams exactly. In 1959, the People's Republic of China reformed traditional weights to align with the metric system. The jin was redefined as exactly half a kilogram — a clean decimal bridge between Chinese tradition and the international system. At the same time, the liang was redefined from 1/16 jin to 1/10 jin (50 g), making the entire system decimal: 1 jin = 10 liang = 100 qian.
The Taiwan Jin (台斤) = 600 grams. Taiwan never adopted the PRC's 1959 reform. It retained the older Japanese-influenced standard where 1 jin = 600 g, and 1 liang = 37.5 g (1/16 jin — the traditional hexadecimal division). This means a Taiwanese recipe calling for "1 jin of pork" is asking for 20% more meat than a mainland Chinese recipe with the same characters.
The Hong Kong Catty (港斤) ≈ 604.8 grams. Hong Kong's catty descends from the British colonial standard, itself derived from the Malay kati. At roughly 1⅓ pounds, it's close to the Taiwan jin but not identical. Hong Kong gold shops quote prices in HKD per tael (37.8 g), and wet markets sell vegetables by the catty — a living example of traditional weights surviving in a modern financial hub.
The stone (14 lbs) is uniquely British — no other country uses it for human body weight. A British person says "I weigh 11 stone 4," meaning 11 st 4 lbs = 158 lbs = 71.7 kg. The stone likely originated from the practice of using actual stones as counterweights in medieval European trade, with different commodities having different standard stones. The pound (lb) derives from the Roman libra (hence the symbol "lb"), originally the weight of 5,040 grains of barley. The ounce (oz) comes from the Roman uncia, meaning "one-twelfth" — originally 1/12 of a Roman pound. Today, 1 lb = 16 oz, and 1 oz = 16 drams = 437.5 grains.
A troy ounce (31.1035 g) is about 10% heavier than a regular avoirdupois ounce (28.3495 g). Precious metals (gold, silver, platinum) are always weighed in troy ounces, while everything else uses avoirdupois ounces. A carat (0.2 g) is the standard unit for gemstones — not to be confused with "karat," which measures gold purity. The word comes from the carob seed, which ancient gem traders used as counterweights because carob seeds have remarkably uniform mass.
| From | To | Multiply By | Example |
|---|---|---|---|
| Kilograms | Pounds | × 2.20462 | 70 kg = 154.3 lbs |
| Pounds | Kilograms | × 0.453592 | 150 lbs = 68.04 kg |
| Stone | Kilograms | × 6.35029 | 11 st = 69.85 kg |
| Jin (PRC) | Kilograms | × 0.5 | 3 jin = 1.5 kg |
| Jin (PRC) | Pounds | × 1.10231 | 3 jin = 3.307 lbs |
| Taiwan Jin | Kilograms | × 0.6 | 2台斤 = 1.2 kg |
| Liang (PRC) | Grams | × 50 | 2两 = 100 g |
| Liang (PRC) | Ounces | × 1.7637 | 2两 = 3.527 oz |
| Troy Ounce | Grams | × 31.1035 | 1 oz t = 31.10 g |
| Carat | Grams | × 0.2 | 5 ct = 1 g |
| Ounces | Grams | × 28.3495 | 16 oz = 453.6 g |
| Long Ton (UK) | Short Ton (US) | × 1.12 | 1 long tn = 1.12 sh tn |
Enter your value in the Kilogram (kg) field. The Pound (lb) field shows the result instantly. 1 kg = 2.20462 lbs. Quick mental shortcut: double the kg number and add 10%. For example, 70 kg → 70 × 2 = 140, plus 14 = 154 lbs (actual: 154.3 lbs).
1 PRC jin (市斤) = 500 g = 0.5 kg = 1.1023 lbs. But be careful — the same character "斤" represents different weights depending on the region. A Taiwan jin = 600 g (20% heavier), and a Hong Kong catty ≈ 604.8 g. This converter shows all three side by side so you can see the difference instantly.
In 1959, mainland China redefined 1 jin = 500 g (exactly half a kilogram) to align with the metric system. Taiwan retained the older standard of 1 jin = 600 g. Hong Kong and Southeast Asian markets use the colonial catty of ~604.8 g (approximately 1⅓ lbs). The historical reason: before 1959, many Chinese regions used 1 jin = 16 liang (hexadecimal division). The PRC decimalized to 1 jin = 10 liang; Taiwan and HK kept the 16-liang structure but with different base values. See the full comparison table above.
1 PRC liang (市两) = 50 g = 1.7637 oz. 1 Taiwan liang = 37.5 g. 1 HK tael = 37.8 g. The liang/tael is commonly used in Chinese medicine prescriptions, gold and silver trading, and traditional food markets. Important: a Hong Kong gold tael (37.8 g) is not the same as a troy ounce (31.1 g) — if you're comparing gold prices, you need to convert both the currency and the weight unit.
1 stone (st) = 14 pounds = 6.35029 kg. The stone is used almost exclusively in the UK and Ireland for expressing human body weight. A British person might say "I weigh 11 stone 4" (11 st 4 lbs = 71.7 kg). The unit dates back to medieval Europe where various standard "stones" were used for trading specific commodities. Britain formally adopted the 14-pound stone in 1835. Interestingly, the UK uses stone for people but kilograms for most other weight measurements — one of the few remaining examples of dual-system usage in everyday life.