Carats to mcg Converter

How to convert carats to micrograms

Formulaµg = ct × 200,000

Multiply the value in carats by 200,000. To go the other way, multiply by 0.000005 (or divide by 200,000).

A carat is larger than a microgram: one carat contains 200,000 micrograms.

Worked examples

1 carat1 ct × 200,000 = 200,000 µg
5 carats5 ct × 200,000 = 1,000,000 µg
10 carats10 ct × 200,000 = 2,000,000 µg
20 carats20 ct × 200,000 = 4,000,000 µg
100 carats100 ct × 200,000 = 20,000,000 µg

Carats to micrograms conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Carats to micrograms: 0.1–10 ct
Carats (ct)	Micrograms (µg)
0.1 ct	20,000 µg
0.25 ct	50,000 µg
0.5 ct	100,000 µg
1 ct	200,000 µg
2 ct	400,000 µg
3 ct	600,000 µg
4 ct	800,000 µg
5 ct	1,000,000 µg
6 ct	1,200,000 µg
7 ct	1,400,000 µg
8 ct	1,600,000 µg
9 ct	1,800,000 µg
10 ct	2,000,000 µg

Carats to micrograms: 12–1,000 ct
Carats (ct)	Micrograms (µg)
12 ct	2,400,000 µg
15 ct	3,000,000 µg
20 ct	4,000,000 µg
25 ct	5,000,000 µg
30 ct	6,000,000 µg
40 ct	8,000,000 µg
50 ct	10,000,000 µg
75 ct	15,000,000 µg
100 ct	20,000,000 µg
250 ct	50,000,000 µg
500 ct	100,000,000 µg
1,000 ct	200,000,000 µg

About the units

Carat (ct)

The metric carat is exactly 200 mg and is used to weigh gemstones. (Karat, a gold-purity scale, is a different thing.) One carat equals 0.0002 kilograms (kg).

Microgram (µg)

One millionth of a gram, often written “mcg” on supplement labels to avoid confusion with mg. One microgram equals 1×10⁻⁹ kilograms (kg).

Frequently asked questions

How many micrograms are in one carat?

There are 200,000 micrograms in one carat, and this value is exact by definition.

How do I convert carats to micrograms?

Multiply the number of carats by 200,000. For example, 10 ct × 200,000 = 2,000,000 µg.

How many carats are in one microgram?

One microgram equals 0.000005 carats. That is the reverse factor, 1 ÷ 200,000.

What is 10 carats in micrograms?

10 ct = 2,000,000 µg.

Is this ct to µg converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.