mcg to Carats Converter

How to convert micrograms to carats

Formulact = µg × 0.000005

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

A microgram is smaller than a carat: it takes 200,000 micrograms to make one carat.

Worked examples

1 microgram1 µg × 0.000005 = 0.000005 ct
5 micrograms5 µg × 0.000005 = 0.000025 ct
10 micrograms10 µg × 0.000005 = 0.00005 ct
20 micrograms20 µg × 0.000005 = 0.0001 ct
100 micrograms100 µg × 0.000005 = 0.0005 ct

Micrograms to carats conversion table

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

Micrograms to carats: 0.1–10 µg
Micrograms (µg)	Carats (ct)
0.1 µg	5×10⁻⁷ ct
0.25 µg	0.00000125 ct
0.5 µg	0.0000025 ct
1 µg	0.000005 ct
2 µg	0.00001 ct
3 µg	0.000015 ct
4 µg	0.00002 ct
5 µg	0.000025 ct
6 µg	0.00003 ct
7 µg	0.000035 ct
8 µg	0.00004 ct
9 µg	0.000045 ct
10 µg	0.00005 ct

Micrograms to carats: 12–1,000 µg
Micrograms (µg)	Carats (ct)
12 µg	0.00006 ct
15 µg	0.000075 ct
20 µg	0.0001 ct
25 µg	0.000125 ct
30 µg	0.00015 ct
40 µg	0.0002 ct
50 µg	0.00025 ct
75 µg	0.000375 ct
100 µg	0.0005 ct
250 µg	0.00125 ct
500 µg	0.0025 ct
1,000 µg	0.005 ct

About the units

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).

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).

Frequently asked questions

How many carats are in one microgram?

There are 0.000005 carats in one microgram, and this value is exact by definition.

How do I convert micrograms to carats?

Multiply the number of micrograms by 0.000005. For example, 10 µg × 0.000005 = 0.00005 ct.

How many micrograms are in one carat?

One carat equals 200,000 micrograms. That is the reverse factor, 1 ÷ 0.000005.

What is 10 micrograms in carats?

10 µg = 0.00005 ct.

Is this µg to ct 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.