Carats to kg Converter

How to convert carats to kilograms

Formulakg = ct × 0.0002

Multiply the value in carats by 0.0002. To go the other way, multiply by 5,000 (or divide by 0.0002).

A carat is smaller than a kilogram: it takes 5,000 carats to make one kilogram.

Worked examples

1 carat1 ct × 0.0002 = 0.0002 kg
5 carats5 ct × 0.0002 = 0.001 kg
10 carats10 ct × 0.0002 = 0.002 kg
20 carats20 ct × 0.0002 = 0.004 kg
100 carats100 ct × 0.0002 = 0.02 kg

Carats to kilograms conversion table

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

Carats to kilograms: 0.1–10 ct
Carats (ct)	Kilograms (kg)
0.1 ct	0.00002 kg
0.25 ct	0.00005 kg
0.5 ct	0.0001 kg
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

Carats to kilograms: 12–1,000 ct
Carats (ct)	Kilograms (kg)
12 ct	0.0024 kg
15 ct	0.003 kg
20 ct	0.004 kg
25 ct	0.005 kg
30 ct	0.006 kg
40 ct	0.008 kg
50 ct	0.01 kg
75 ct	0.015 kg
100 ct	0.02 kg
250 ct	0.05 kg
500 ct	0.1 kg
1,000 ct	0.2 kg

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).

Kilogram (kg)

The SI base unit of mass, defined since 2019 through the Planck constant. A litre of water has a mass of almost exactly 1 kg.

Frequently asked questions

How many kilograms are in one carat?

There are 0.0002 kilograms in one carat, and this value is exact by definition.

How do I convert carats to kilograms?

Multiply the number of carats by 0.0002. For example, 10 ct × 0.0002 = 0.002 kg.

How many carats are in one kilogram?

One kilogram equals 5,000 carats. That is the reverse factor, 1 ÷ 0.0002.

What is 10 carats in kilograms?

10 ct = 0.002 kg.

Is this ct to kg 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.