Convert Carats to Micrograms
Convert Carats to Micrograms instantly. 1 Carat (ct) equals 200,000 Micrograms (µg).
Carats to Micrograms conversion table
| Carats (ct) | Micrograms (µg) |
|---|---|
| 1 ct | 200,000 µg |
| 2 ct | 400,000 µg |
| 3 ct | 600,000 µg |
| 5 ct | 1,000,000 µg |
| 10 ct | 2,000,000 µg |
| 20 ct | 4,000,000 µg |
| 50 ct | 10,000,000 µg |
| 100 ct | 20,000,000 µg |
| 500 ct | 100,000,000 µg |
| 1,000 ct | 200,000,000 µg |
1 Carat = 200,000 Micrograms · multiply Carats by 200,000
About converting Carats to Micrograms
Carats (ct) and Micrograms (µg) are both units of weight & mass, so converting between them is a single multiplication: multiply your Carats figure by 200,000. Ten Carats comes to 2,000,000 Micrograms, and a hundred works out at 20,000,000 Micrograms.
Rule of thumb: going from Carats to Micrograms multiplies, so the figure always grows — one Carat is already 200,000 Micrograms. 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 Microgram?
A microgram is one millionth of a gram, and in medicine it is a genuinely dangerous unit. Several important drugs — levothyroxine for the thyroid, fentanyl, digoxin — are dosed in micrograms while others are dosed in milligrams, and a prescription misread across that thousandfold gap is a well-documented category of medication error. Because a handwritten Greek µ can be mistaken for an m, hospital safety guidance often requires the abbreviation to be spelled out as "mcg" instead. Outside the clinic, micrograms measure vitamins and airborne pollutants.
To put both in perspective: a typical engagement-ring diamond weighs about one carat, while a single grain of table salt weighs a few dozen micrograms.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Micrograms to Carats converter, or browse all Weight & Mass converters.
Frequently asked questions
How many Micrograms are in one Carat?
There are 200,000 Micrograms in one Carat.
How do I convert Carats to Micrograms?
Multiply the number of Carats by 200,000. For example, 10 Carats = 2,000,000 Micrograms.
What is 100 Carats in Micrograms?
100 Carats is equal to 20,000,000 Micrograms.
How do I convert Micrograms to Carats?
Multiply the Micrograms value by 0.000005 (or divide by 200,000).
Is this Carats to Micrograms conversion exact?
The definition is exact — Carats and Micrograms are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
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 Microgram?
A microgram is one millionth of a gram, and in medicine it is a genuinely dangerous unit. Several important drugs — levothyroxine for the thyroid, fentanyl, digoxin — are dosed in micrograms while others are dosed in milligrams, and a prescription misread across that thousandfold gap is a well-documented category of medication error. Because a handwritten Greek µ can be mistaken for an m, hospital safety guidance often requires the abbreviation to be spelled out as "mcg" instead. Outside the clinic, micrograms measure vitamins and airborne pollutants.