Convert Carats to Milligrams
Convert Carats to Milligrams instantly. 1 Carat (ct) equals 200 Milligrams (mg).
Carats to Milligrams conversion table
| Carats (ct) | Milligrams (mg) |
|---|---|
| 1 ct | 200 mg |
| 2 ct | 400 mg |
| 3 ct | 600 mg |
| 5 ct | 1,000 mg |
| 10 ct | 2,000 mg |
| 20 ct | 4,000 mg |
| 50 ct | 10,000 mg |
| 100 ct | 20,000 mg |
| 500 ct | 100,000 mg |
| 1,000 ct | 200,000 mg |
1 Carat = 200 Milligrams · multiply Carats by 200
About converting Carats to Milligrams
Carats (ct) and Milligrams (mg) are both units of weight & mass, so converting between them is a single multiplication: multiply your Carats figure by 200. Ten Carats comes to 2,000 Milligrams, and a hundred works out at 20,000 Milligrams.
Rule of thumb: going from Carats to Milligrams multiplies, so the figure always grows — one Carat is already 200 Milligrams. If your answer came out smaller, you have the conversion the wrong way round.
What is a Carat?
The metric carat is 0.2 grams exactly, standardised early in the twentieth century to replace a tangle of local carats that differed from one gem market to the next. Its name is traditionally traced to the carob seed, once used as a counterweight for small valuables. The trap is the near-identical karat, which is not a mass at all — it measures gold purity in twenty-fourths, so 18-karat gold is eighteen parts gold to six of other metal. Jewellers also split the carat into 100 points, which is why a "fifty-point" diamond is simply half a carat.
What is a Milligram?
A milligram is one thousandth of a gram, and it marks the point where measurement stops being about objects and starts being about doses and traces. Nutrition labels give sodium, cholesterol and most vitamins in milligrams; pharmacies dispense tablets by them; environmental limits on lead or arsenic are written in milligrams per litre. Milligrams sit well below the resolution of any kitchen or shop scale — reading them takes a laboratory balance — which is why the unit belongs to pharmacists, chemists and regulators rather than to everyday life.
To put both in perspective: a typical engagement-ring diamond weighs about one carat, while a grain of rice weighs roughly 25 milligrams.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Milligrams to Carats converter, or browse all Weight & Mass converters.
Frequently asked questions
How many Milligrams are in one Carat?
There are 200 Milligrams in one Carat.
How do I convert Carats to Milligrams?
Multiply the number of Carats by 200. For example, 10 Carats = 2,000 Milligrams.
What is 100 Carats in Milligrams?
100 Carats is equal to 20,000 Milligrams.
How do I convert Milligrams to Carats?
Multiply the Milligrams value by 0.005 (or divide by 200).
Is this Carats to Milligrams conversion exact?
Yes, exactly. Both units are fixed against the same base by definition, and 1 Carat = 200 Milligrams is the complete value — nothing is rounded away.
What is a Carat?
The metric carat is 0.2 grams exactly, standardised early in the twentieth century to replace a tangle of local carats that differed from one gem market to the next. Its name is traditionally traced to the carob seed, once used as a counterweight for small valuables. The trap is the near-identical karat, which is not a mass at all — it measures gold purity in twenty-fourths, so 18-karat gold is eighteen parts gold to six of other metal. Jewellers also split the carat into 100 points, which is why a "fifty-point" diamond is simply half a carat.
What is a Milligram?
A milligram is one thousandth of a gram, and it marks the point where measurement stops being about objects and starts being about doses and traces. Nutrition labels give sodium, cholesterol and most vitamins in milligrams; pharmacies dispense tablets by them; environmental limits on lead or arsenic are written in milligrams per litre. Milligrams sit well below the resolution of any kitchen or shop scale — reading them takes a laboratory balance — which is why the unit belongs to pharmacists, chemists and regulators rather than to everyday life.