Carats to Kilograms Conversion (ct to kg)

Carats to Kilograms Converter

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

Result in Kilograms:

1 ct = 0.0002 kg

How to Convert Carats to Kilograms

To convert a measurement in carats to a measurement in kilograms, divide the weight by the following conversion ratio: 5,000 carats/kilogram.

Since one kilogram is equal to 5,000 carats, you can use this simple formula to convert:

kilograms = carats ÷ 5,000

The weight in kilograms is equal to the weight in carats divided by 5,000.

For example, here's how to convert 5,000 carats to kilograms using the formula above.

kilograms = (5,000 ct ÷ 5,000) = 1 kg

Carats and kilograms 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 Kilogram?

One kilogram is equal to 1,000 grams, 2.204623 pounds, or 1/1,000 of a metric ton.

The formal definition of the kilogram changed in 2019. One kilogram was previously equal to the mass of the platinum-iridium bar, known as the International Prototype of the Kilogram, which was stored in Sèvres, France.

The 2019 SI brochure now defines the kilogram using the Planck constant, and it is defined using the meter and second.^[2] It is equal to the mass of 1,000 cubic centimeters, or milliliters, of water.

The kilogram, or kilogramme, is the SI base unit for weight and is also a multiple of the gram. In the metric system, "kilo" is the prefix for thousands, or 10³. Kilograms can be abbreviated as kg; for example, 1 kilogram can be written as 1 kg.

Learn more about kilograms.

Carat to Kilogram Conversion Table

Table showing various carat measurements converted to kilograms.
Carats	Kilograms
1 ct	0.0002 kg
2 ct	0.0004 kg
3 ct	0.0006 kg
4 ct	0.0008 kg
5 ct	0.001 kg
6 ct	0.0012 kg
7 ct	0.0014 kg
8 ct	0.0016 kg
9 ct	0.0018 kg
10 ct	0.002 kg
20 ct	0.004 kg
30 ct	0.006 kg
40 ct	0.008 kg
50 ct	0.01 kg
60 ct	0.012 kg
70 ct	0.014 kg
80 ct	0.016 kg
90 ct	0.018 kg
100 ct	0.02 kg
200 ct	0.04 kg
300 ct	0.06 kg
400 ct	0.08 kg
500 ct	0.1 kg
600 ct	0.12 kg
700 ct	0.14 kg
800 ct	0.16 kg
900 ct	0.18 kg
1,000 ct	0.2 kg
2,000 ct	0.4 kg
3,000 ct	0.6 kg
4,000 ct	0.8 kg
5,000 ct	1 kg
6,000 ct	1.2 kg
7,000 ct	1.4 kg
8,000 ct	1.6 kg
9,000 ct	1.8 kg
10,000 ct	2 kg

Table showing various carat measurements converted to kilograms.

Carats

Kilograms

1 ct

0.0002 kg

2 ct

0.0004 kg

3 ct

0.0006 kg

4 ct

0.0008 kg

5 ct

0.001 kg

6 ct

0.0012 kg

7 ct

0.0014 kg

8 ct

0.0016 kg

9 ct

0.0018 kg

10 ct

0.002 kg

20 ct

0.004 kg

30 ct

0.006 kg

40 ct

0.008 kg

50 ct

0.01 kg

60 ct

0.012 kg

70 ct

0.014 kg

80 ct

0.016 kg

90 ct

0.018 kg

100 ct

0.02 kg

200 ct

0.04 kg

300 ct

0.06 kg

400 ct

0.08 kg

500 ct

0.1 kg

600 ct

0.12 kg

700 ct

0.14 kg

800 ct

0.16 kg

900 ct

0.18 kg

1,000 ct

0.2 kg

2,000 ct

0.4 kg

3,000 ct

0.6 kg

4,000 ct

0.8 kg

5,000 ct

1 kg

6,000 ct

1.2 kg

7,000 ct

1.4 kg

8,000 ct

1.6 kg

9,000 ct

1.8 kg

10,000 ct

2 kg

References

National Institute of Standards and Technology, Precious Metals Conversion Information, https://www.nist.gov/pml/owm/laws-and-regulations/precious-metals-conversion
International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf