Convert weight and mass units — kilograms, pounds, grams, ounces, tons, carats and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 ct | 0.2 mg | |
| 0.01 ct | 2 mg | |
| 0.1 ct | 20 mg | |
| 1 ct | 200 mg | |
| 5 ct | 1000 mg | |
| 10 ct | 2000 mg | |
| 50 ct | 10000 mg | |
| 100 ct | 20000 mg | |
| 1000 ct | 200000 mg |
The Milligram (mg) and the Gram (g) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 ct = 200 mg
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Carat (ct) | Milligram (mg) | Real-world context |
|---|---|---|
| 0.1 ct | 20 mg | |
| 1 ct | 200 mg | solitaire diamond |
| 5 ct | 1000 mg | |
| 10 ct | 2000 mg | collector gem |
| 100 ct | 20000 mg |
1 carat (ct) equals exactly 200 milligrams (mg). Use the formula: ct × 200 = mg.
To convert carats to milligrams, multiply your value in carats by 200. For example, 5 ct × 200 = 1000 mg.
100 carats = 20000 milligrams. Calculation: 100 × 200 = 20000.
To convert milligrams back to carats, divide by 200 (or multiply by 0.005). Example: 10 mg ÷ 200 = 0.05 ct.
Yes. This converter uses the internationally recognised exact conversion factor: 1 ct = 200 mg. All calculations are performed in your browser with no rounding until display.
10 carats = 2000 milligrams. Simply multiply by 200.
Converting carats to milligrams is commonly needed for medical dosing, laboratory measurements, pharmaceutical calculations, and quality control testing where one system uses ct and another uses mg.
The metric carat (ct) is the unit of mass used worldwide for gemstones and pearls, equal to exactly 200 milligrams (0.2 g). It is distinct from "karat" (K), the measure of gold purity (24K = 100% gold). A 1-carat diamond weighs exactly 0.2 g; the famous 45.52-carat Hope Diamond weighs approximately 9.1 g.
The milligram (mg) is a unit of mass equal to one-thousandth of a gram (0.001 g) or one-millionth of a kilogram (10⁻⁶ kg). It is the standard unit for drug dosing in medicine and pharmacology, where precise small quantities are critical for safety and efficacy. The prefix "milli-" comes from Latin mille meaning one thousand.
The word "carat" derives from Greek keration (κεράτιον), meaning carob pod. Carob seeds were believed to have remarkably uniform weight and were used as counterweights for balancing precious stones. The carat value varied across countries (0.187–0.216 g) until the Fourth General Conference on Weights and Measures standardised the metric carat at exactly 200 mg in 1907. Most countries adopted the metric carat between 1914 and 1930.
Interesting fact: The largest gem-quality diamond ever found, the Cullinan Diamond (1905), weighed 3,106.75 carats (621.35 g) before being cut into 9 major and 96 minor stones, two of which are in the British Crown Jewels.
Established as a derived unit when the metric system was formalised in the late 18th century. The milligram rose to critical importance with the growth of pharmacology in the 19th and 20th centuries, as chemists isolated active compounds and found that tiny quantities produced strong therapeutic — or toxic — effects. Modern pharmacopoeias worldwide specify drug doses in milligrams.
Interesting fact: A single grain of table salt weighs about 58 mg. One standard 325 mg aspirin tablet means that 1,000 tablets weigh only 325 grams — less than a can of soft drink.