How to convert carats to grams
g = ct × 0.2Multiply the value in carats by 0.2. To go the other way, multiply by 5 (or divide by 0.2).
A carat is smaller than a gram: it takes 5 carats to make one gram.
Worked examples
- 1 carat1 ct × 0.2 = 0.2 g
- 5 carats5 ct × 0.2 = 1 g
- 10 carats10 ct × 0.2 = 2 g
- 20 carats20 ct × 0.2 = 4 g
- 100 carats100 ct × 0.2 = 20 g
Carats to grams conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Carats (ct) | Grams (g) |
|---|---|
| 0.1 ct | 0.02 g |
| 0.25 ct | 0.05 g |
| 0.5 ct | 0.1 g |
| 1 ct | 0.2 g |
| 2 ct | 0.4 g |
| 3 ct | 0.6 g |
| 4 ct | 0.8 g |
| 5 ct | 1 g |
| 6 ct | 1.2 g |
| 7 ct | 1.4 g |
| 8 ct | 1.6 g |
| 9 ct | 1.8 g |
| 10 ct | 2 g |
| Carats (ct) | Grams (g) |
|---|---|
| 12 ct | 2.4 g |
| 15 ct | 3 g |
| 20 ct | 4 g |
| 25 ct | 5 g |
| 30 ct | 6 g |
| 40 ct | 8 g |
| 50 ct | 10 g |
| 75 ct | 15 g |
| 100 ct | 20 g |
| 250 ct | 50 g |
| 500 ct | 100 g |
| 1,000 ct | 200 g |
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).
Gram (g)
One thousandth of a kilogram. Recipes, nutrition labels and postal scales use grams; a US nickel weighs 5 g. One gram equals 0.001 kilograms (kg).
Frequently asked questions
How many grams are in one carat?
There are 0.2 grams in one carat, and this value is exact by definition.
How do I convert carats to grams?
Multiply the number of carats by 0.2. For example, 10 ct × 0.2 = 2 g.
How many carats are in one gram?
One gram equals 5 carats. That is the reverse factor, 1 ÷ 0.2.
What is 10 carats in grams?
10 ct = 2 g.
Is this ct to g 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.