Carat to Gram Converter
Convert Carat (ct) to Gram (g) instantly. 1 ct = 0.2 g.
Mass Converter
26 units available
1 ct = 0.2 g
Formula:
g = ct × 0.2With your value: 1 ct = 0.2 g
How big is that?
Everyday references on a logarithmic scale, all expressed in carat so you can sanity-check the result.
Other Carat to Gram conversions
Carat to Gram Conversion Table
| Carat (ct) | Gram (g) |
|---|---|
| 0.5 | 0.1 |
| 1 | 0.2 |
| 2 | 0.4 |
| 5 | 1 |
| 10 | 2 |
| 15 | 3 |
| 20 | 4 |
| 25 | 5 |
| 50 | 10 |
| 100 | 20 |
| 250 | 50 |
| 500 | 100 |
| 1000 | 200 |
Gram to Carat Conversion Table
| Gram (g) | Carat (ct) |
|---|---|
| 0.5 | 2.5 |
| 1 | 5 |
| 2 | 10 |
| 5 | 25 |
| 10 | 50 |
| 15 | 75 |
| 20 | 100 |
| 25 | 125 |
| 50 | 250 |
| 100 | 500 |
| 250 | 1,250 |
| 500 | 2,500 |
| 1000 | 5,000 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Carat (ct)
Mass
The metric carat is exactly 200 mg, agreed internationally in 1907.
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Gram (g)
Mass
Traceable to the kilogram, defined by fixing the Planck constant at 6.626 070 15 × 10⁻³⁴ J·s. Avoirdupois masses derive from the 1959 international pound (0.453 592 37 kg exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Carat to Gram
To convert from Carat (ct) to Gram (g), multiply the value by 0.2.
Formula: g = ct × 0.2
Reverse: ct = g × 5
Step-by-Step Example
- Start with your value in Carat. For example: 5 ct
- Multiply by the conversion factor: 5 x 0.2
- The result is: 1 g
About Carat
The carat equals 200 milligrams and is the standard unit for measuring gemstone weight.
Fun Fact: The word "carat" comes from the carob seed, which was used as a balance weight in ancient gem trading.
Common uses: gemstones, diamonds, jewelry.
About Gram
The gram equals one thousandth of a kilogram. It is commonly used for measuring food, ingredients, and small items.
Common uses: cooking, nutrition labels, jewelry.
Frequently Asked Questions
How many Gram are in 1 Carat?
There are exactly 0.2 Gram in 1 Carat. This means the conversion factor from Carat to Gram is 0.2.
What is the formula to convert Carat to Gram?
The formula to convert Carat to Gram is: g = ct × 0.2. For example, to convert 10 Carat to Gram, you would multiply 10 by 0.2.
What is a Carat?
The carat equals 200 milligrams and is the standard unit for measuring gemstone weight.
What is a Gram?
The gram equals one thousandth of a kilogram. It is commonly used for measuring food, ingredients, and small items.
What are the common uses of Carat?
The Carat is commonly used in gemstones, diamonds, jewelry.
Related Mass Conversions
Cite this page
UnitConvertLab. (2026). Carat to Gram converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/carat-to-gram