# Carats to Grams (ct to g)

Source: https://www.unitconvertercalculator.com/weight/carats-to-grams/

**1 ct = 0.2 g**

One carat equals exactly 0.2 grams or 200 milligrams. This conversion is fundamental in the gemstone and jewelry trade, where diamonds and precious stones are weighed in carats but gold and settings are measured in grams.

## Formula

Apply the conversion factor

## Conversion Table

| Carats (ct) | Grams (g) |
|---|---|
| 0.1 ct | 0.02 g |
| 0.25 ct | 0.05 g |
| 0.5 ct | 0.1 g |
| 0.75 ct | 0.15 g |
| 1 ct | 0.2 g |
| 1.5 ct | 0.3 g |
| 2 ct | 0.4 g |
| 3 ct | 0.6 g |
| 5 ct | 1 g |
| 10 ct | 2 g |
| 15 ct | 3 g |
| 20 ct | 4 g |
| 25 ct | 5 g |
| 50 ct | 10 g |
| 100 ct | 20 g |
| 250 ct | 50 g |
| 500 ct | 100 g |
| 1000 ct | 200 g |
| 5000 ct | 1000 g |

## Units

### Carat (ct)

A carat is a unit of mass equal to exactly 200 milligrams (0.2 grams), used for measuring gemstones and pearls. Adopted internationally in 1907 by the Fourth General Conference on Weights and Measures.

### Gram (g)

A metric unit of mass equal to one thousandth of a kilogram. Widely used in cooking, nutrition labeling, and science.

## Background

A 2-carat diamond weighs just 0.4 grams - surprisingly light for its value. A jeweler weighing a loose stone on a gram scale needs to multiply by 5 to get the carat weight. When comparing gemstone prices internationally, the carat-to-gram conversion helps standardize valuations across different weighing conventions.

## Good to Know

Diamond engagement rings in the US average about 1 carat (0.2 grams). In many Asian countries, gold weight matters more than diamond size for jewelry value, making the carat-to-gram distinction culturally significant.

## FAQ

### How many grams is 1 carat?

One metric carat equals exactly 0.2 grams (200 milligrams). This has been the standard since 1907 when the Fourth General Conference on Weights and Measures adopted this definition.

### How do I convert carats to grams?

Multiply the number of carats by 0.2. For example, 3 carats × 0.2 = 0.6 grams. Alternatively, divide the carat weight by 5.

### Is a carat the same as a karat?

No. A carat (ct) measures the weight of gemstones (1 ct = 0.2 grams). A karat (K or kt) measures the purity of gold alloys (24K = pure gold, 18K = 75% gold). They are completely different units that sound alike.

## Non-Frequently Asked Questions

### Is a carat the same as a carrot?

No. A carat (200 mg) measures gemstone weight. A carrot (about 60 g) is a vegetable. A 1-carat diamond costs thousands. A 1-carrot... costs about 10 cents. The spelling difference is worth approximately $4,999.90.

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## See Also

- [Grams to Carats](https://www.unitconvertercalculator.com/weight/grams-to-carats/)