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.

Carats to Grams (ct to g) Converter

1 ct = 0.2 g

1 Carat equals 0.2 Grams (1 ct = 0.2 g). Convert Carats to Grams with formula, table, and examples.

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.

How to Convert Carats to Grams

g = ct ÷ 5

Divide the value in Carats by 5

Take your value in Carats
Divide by 5
Read the result in Grams

Common Carats to Grams Conversions

Carats (ct)	Grams (g)	Status
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
1,000 ct	200 g
5,000 ct	1,000 g

Good to Know About Carats to Grams Conversion

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.

Carats to Grams: What You Need to Know

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.

What is a 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.

Metric diamond weight gemstone grading pearl measurement

Learn more about Carat →

What is a Gram? g

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

Metric cooking nutrition labels postal weight

Learn more about Gram →

Going the other way? Use our Grams to Carats converter.

Carats to Grams FAQ

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

Questions nobody should ask - but someone did.

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.