How to convert carats to grams
g = ct × 0.2
Example: 5 ct × 0.2 = 1 g
Carats to Grams table
| Carats (ct) | Grams (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 |
| 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 these units
Carats (ct): The metric carat is exactly 200 milligrams (0.2 g). It is used to weigh diamonds and gemstones – not to be confused with karat, the purity of gold.
Grams (g): A gram is one thousandth of a kilogram, used for food, ingredients, jewellery and postage.
Frequently asked questions
How many grams are in 1 carat?
1 carat (ct) equals 0.2 grams.
How do I convert ct to g?
Multiply the value in carats by 0.2. For example, 5 ct × 0.2 = 1 g.
How do I convert grams back to carats?
Multiply by 5 (or divide by 0.2). 1 g = 5 ct.
What is a carat?
The metric carat is exactly 200 milligrams (0.2 g). It is used to weigh diamonds and gemstones – not to be confused with karat, the purity of gold.
Conversion factors come from exact international definitions (NIST SP 811, BIPM) where they exist. Results show up to 10 significant digits. Need every weight / mass unit at once? Use the Weight Converter.