Carats to Milligrams Conversion (ct to mg)

Carats to Milligrams Converter

Enter the weight in carats below to get the value converted to milligrams.

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Result in Milligrams:

1 ct = 200 mg

How to Convert Carats to Milligrams

To convert a measurement in carats to a measurement in milligrams, multiply 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:

milligrams = carats × 200

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

For example, here's how to convert 5 carats to milligrams using the formula above.

milligrams = (5 ct × 200) = 1,000 mg

How Many Milligrams Are in a Carat?

There are 200 milligrams in a carat, which is why we use this value in the formula above.

1 ct = 200 mg

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

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.

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.

Carat to Milligram Conversion Table

Table showing various carat measurements converted to milligrams.
Carats	Milligrams
1 ct	200 mg
2 ct	400 mg
3 ct	600 mg
4 ct	800 mg
5 ct	1,000 mg
6 ct	1,200 mg
7 ct	1,400 mg
8 ct	1,600 mg
9 ct	1,800 mg
10 ct	2,000 mg
11 ct	2,200 mg
12 ct	2,400 mg
13 ct	2,600 mg
14 ct	2,800 mg
15 ct	3,000 mg
16 ct	3,200 mg
17 ct	3,400 mg
18 ct	3,600 mg
19 ct	3,800 mg
20 ct	4,000 mg
21 ct	4,200 mg
22 ct	4,400 mg
23 ct	4,600 mg
24 ct	4,800 mg
25 ct	5,000 mg
26 ct	5,200 mg
27 ct	5,400 mg
28 ct	5,600 mg
29 ct	5,800 mg
30 ct	6,000 mg
31 ct	6,200 mg
32 ct	6,400 mg
33 ct	6,600 mg
34 ct	6,800 mg
35 ct	7,000 mg
36 ct	7,200 mg
37 ct	7,400 mg
38 ct	7,600 mg
39 ct	7,800 mg
40 ct	8,000 mg

Table showing various carat measurements converted to milligrams.

Carats

Milligrams

1 ct

200 mg

2 ct

400 mg

3 ct

600 mg

4 ct

800 mg

5 ct

1,000 mg

6 ct

1,200 mg

7 ct

1,400 mg

8 ct

1,600 mg

9 ct

1,800 mg

10 ct

2,000 mg

11 ct

2,200 mg

12 ct

2,400 mg

13 ct

2,600 mg

14 ct

2,800 mg

15 ct

3,000 mg

16 ct

3,200 mg

17 ct

3,400 mg

18 ct

3,600 mg

19 ct

3,800 mg

20 ct

4,000 mg

21 ct

4,200 mg

22 ct

4,400 mg

23 ct

4,600 mg

24 ct

4,800 mg

25 ct

5,000 mg

26 ct

5,200 mg

27 ct

5,400 mg

28 ct

5,600 mg

29 ct

5,800 mg

30 ct

6,000 mg

31 ct

6,200 mg

32 ct

6,400 mg

33 ct

6,600 mg

34 ct

6,800 mg

35 ct

7,000 mg

36 ct

7,200 mg

37 ct

7,400 mg

38 ct

7,600 mg

39 ct

7,800 mg

40 ct

8,000 mg

References

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