mg to Carats Converter

How to convert milligrams to carats

Formulact = mg × 0.005

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

A milligram is smaller than a carat: it takes 200 milligrams to make one carat.

Worked examples

1 milligram1 mg × 0.005 = 0.005 ct
5 milligrams5 mg × 0.005 = 0.025 ct
10 milligrams10 mg × 0.005 = 0.05 ct
20 milligrams20 mg × 0.005 = 0.1 ct
100 milligrams100 mg × 0.005 = 0.5 ct

Milligrams to carats conversion table

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

Milligrams to carats: 0.1–10 mg
Milligrams (mg)	Carats (ct)
0.1 mg	0.0005 ct
0.25 mg	0.00125 ct
0.5 mg	0.0025 ct
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

Milligrams to carats: 12–1,000 mg
Milligrams (mg)	Carats (ct)
12 mg	0.06 ct
15 mg	0.075 ct
20 mg	0.1 ct
25 mg	0.125 ct
30 mg	0.15 ct
40 mg	0.2 ct
50 mg	0.25 ct
75 mg	0.375 ct
100 mg	0.5 ct
250 mg	1.25 ct
500 mg	2.5 ct
1,000 mg	5 ct

About the units

Milligram (mg)

One thousandth of a gram. Medication doses and vitamin contents are usually given in milligrams. One milligram equals 0.000001 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 milligram?

There are 0.005 carats in one milligram, and this value is exact by definition.

How do I convert milligrams to carats?

Multiply the number of milligrams by 0.005. For example, 10 mg × 0.005 = 0.05 ct.

How many milligrams are in one carat?

One carat equals 200 milligrams. That is the reverse factor, 1 ÷ 0.005.

What is 10 milligrams in carats?

10 mg = 0.05 ct.

Is this mg 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.