Convert weight and mass units — kilograms, pounds, grams, ounces, tons, carats and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 ct | 2e-07 kg | |
| 0.01 ct | 2e-06 kg | |
| 0.1 ct | 2e-05 kg | |
| 1 ct | 0.0002 kg | |
| 5 ct | 0.001 kg | |
| 10 ct | 0.002 kg | |
| 50 ct | 0.01 kg | |
| 100 ct | 0.02 kg | |
| 1000 ct | 0.2 kg |
The Milligram (mg) and the Gram (g) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 ct = 0.0002 kg
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Carat (ct) | Kilogram (kg) | Real-world context |
|---|---|---|
| 1 ct | 0.0002 kg | solitaire diamond |
| 100 ct | 0.02 kg | |
| 1000 ct | 0.2 kg | |
| 10000 ct | 2 kg | |
| 100000 ct | 20 kg |
1 carat (ct) equals exactly 0.0002 kilograms (kg). Use the formula: ct × 0.0002 = kg.
To convert carats to kilograms, multiply your value in carats by 0.0002. For example, 5 ct × 0.0002 = 0.001 kg.
100 carats = 0.02 kilograms. Calculation: 100 × 0.0002 = 0.02.
To convert kilograms back to carats, divide by 0.0002 (or multiply by 5000). Example: 10 kg ÷ 0.0002 = 50000 ct.
Yes. This converter uses the internationally recognised exact conversion factor: 1 ct = 0.0002 kg. All calculations are performed in your browser with no rounding until display.
10 carats = 0.002 kilograms. Simply multiply by 0.0002.
Converting carats to kilograms is commonly needed for jewellery valuation, gemstone trading, precious metal buying and selling, and hallmarking compliance where one system uses ct and another uses kg.
The metric carat (ct) is the unit of mass used worldwide for gemstones and pearls, equal to exactly 200 milligrams (0.2 g). It is distinct from "karat" (K), the measure of gold purity (24K = 100% gold). A 1-carat diamond weighs exactly 0.2 g; the famous 45.52-carat Hope Diamond weighs approximately 9.1 g.
The kilogram (kg) is the SI base unit of mass — one of seven fundamental units in the International System. Equal to exactly 1,000 grams, it is the foundation of weight measurement in science, medicine, engineering, and commerce worldwide. Uniquely among SI base units, the kilogram is named with a metric prefix ("kilo-" = 1,000).
The word "carat" derives from Greek keration (κεράτιον), meaning carob pod. Carob seeds were believed to have remarkably uniform weight and were used as counterweights for balancing precious stones. The carat value varied across countries (0.187–0.216 g) until the Fourth General Conference on Weights and Measures standardised the metric carat at exactly 200 mg in 1907. Most countries adopted the metric carat between 1914 and 1930.
Interesting fact: The largest gem-quality diamond ever found, the Cullinan Diamond (1905), weighed 3,106.75 carats (621.35 g) before being cut into 9 major and 96 minor stones, two of which are in the British Crown Jewels.
Defined in 1795 by the French Revolutionary government as the mass of one cubic decimetre of distilled water at 4 °C. A platinum prototype (the Kilogramme des Archives) was created in 1799. From 1889 until 2019, the world's mass standard was the International Prototype Kilogram — a platinum-iridium cylinder stored in Sèvres, France. In 2019, the kilogram was redefined in terms of Planck's constant (h = 6.626 070 15 × 10⁻³⁴ J·s), eliminating the need for a physical artifact.
Interesting fact: The IPK and its official copies drifted apart by up to 50 micrograms over 130 years, motivating the 2019 redefinition. The kilogram is the only SI unit whose name starts with a prefix.