Milligrams to Carats Conversion (mg to ct)

Milligrams to Carats Converter

Enter the weight in milligrams below to convert it to carats.

Result in Carats:

1 mg = 0.005 ct

How to Convert Milligrams to Carats

To convert a measurement in milligrams to a measurement in carats, divide the weight by the following conversion ratio: 200 milligrams/carat.

Since one carat is equal to 200 milligrams, you can use this simple formula to convert:

carats = milligrams ÷ 200

The weight in carats is equal to the weight in milligrams divided by 200.

For example, here's how to convert 500 milligrams to carats using the formula above.

carats = (500 mg ÷ 200) = 2.5 ct

Milligrams and carats are both units used to measure weight. Keep reading to learn more about each unit of measure.

What Is a Milligram?

The milligram is a unit of mass equal to 1/1,000 of a gram, or 0.0154 grains.

The milligram, or milligramme, is an SI unit of weight in the metric system. In the metric system, "milli" is the prefix for thousandths, or 10^-3. Milligrams can be abbreviated as mg; for example, 1 milligram can be written as 1 mg.

Learn more about milligrams.

What Is a Carat?

The carat is a unit of mass/weight equal to 200 milligrams.^[1]

A carat is sometimes also referred to as a metric carat. Carats can be abbreviated as ct, and are also sometimes abbreviated as CD. For example, 1 carat can be written as 1 ct or 1 CD.

Learn more about carats.

Milligram to Carat Conversion Table

Table showing various milligram measurements converted to carats.
Milligrams	Carats
1 mg	0.005 ct
2 mg	0.01 ct
3 mg	0.015 ct
4 mg	0.02 ct
5 mg	0.025 ct
6 mg	0.03 ct
7 mg	0.035 ct
8 mg	0.04 ct
9 mg	0.045 ct
10 mg	0.05 ct
20 mg	0.1 ct
30 mg	0.15 ct
40 mg	0.2 ct
50 mg	0.25 ct
60 mg	0.3 ct
70 mg	0.35 ct
80 mg	0.4 ct
90 mg	0.45 ct
100 mg	0.5 ct
200 mg	1 ct
300 mg	1.5 ct
400 mg	2 ct
500 mg	2.5 ct
600 mg	3 ct
700 mg	3.5 ct
800 mg	4 ct
900 mg	4.5 ct
1,000 mg	5 ct

Table showing various milligram measurements converted to carats.

Milligrams

Carats

1 mg

0.005 ct

2 mg

0.01 ct

3 mg

0.015 ct

4 mg

0.02 ct

5 mg

0.025 ct

6 mg

0.03 ct

7 mg

0.035 ct

8 mg

0.04 ct

9 mg

0.045 ct

10 mg

0.05 ct

20 mg

0.1 ct

30 mg

0.15 ct

40 mg

0.2 ct

50 mg

0.25 ct

60 mg

0.3 ct

70 mg

0.35 ct

80 mg

0.4 ct

90 mg

0.45 ct

100 mg

0.5 ct

200 mg

1 ct

300 mg

1.5 ct

400 mg

2 ct

500 mg

2.5 ct

600 mg

3 ct

700 mg

3.5 ct

800 mg

4 ct

900 mg

4.5 ct

1,000 mg

5 ct

References

National Institute of Standards and Technology, Precious Metals Conversion Information, https://www.nist.gov/pml/owm/laws-and-regulations/precious-metals-conversion