Carats to mg Converter

How to convert carats to milligrams

Formulamg = ct × 200

Multiply the value in carats by 200. To go the other way, multiply by 0.005 (or divide by 200).

A carat is larger than a milligram: one carat contains 200 milligrams.

Worked examples

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

Carats to milligrams conversion table

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

Carats to milligrams: 0.1–10 ct
Carats (ct)	Milligrams (mg)
0.1 ct	20 mg
0.25 ct	50 mg
0.5 ct	100 mg
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

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

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).

Milligram (mg)

One thousandth of a gram. Medication doses and vitamin contents are usually given in milligrams. One milligram equals 0.000001 kilograms (kg).

Frequently asked questions

How many milligrams are in one carat?

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

How do I convert carats to milligrams?

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

How many carats are in one milligram?

One milligram equals 0.005 carats. That is the reverse factor, 1 ÷ 200.

What is 10 carats in milligrams?

10 ct = 2,000 mg.

Is this ct to mg 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.