How many centigrams are in one carat?

One carat equals exactly 20 centigrams. This comes from 1 carat being 0.2 grams (200 milligrams) and 1 centigram being 0.01 grams (10 milligrams): 200 divided by 10 equals 20.

When would I need to convert centigrams to carats?

This conversion arises when using laboratory scales that display in centigrams, reading historical pharmaceutical records that recorded gemstone weights in metric sub-units, or converting between European scientific notation and gemological terminology.

Is the centigram part of the metric system?

Yes. The centigram (cg) is a standard SI-compatible unit equal to one hundredth of a gram. It follows the same prefix logic as centimeter (one hundredth of a meter). However, it is rarely used in practice, with milligrams and grams preferred for most applications.

Centigrams to Carats (cg to ct) Converter

1 cg = 0.05 ct

1 Centigram equals 0.05 Carats (1 cg = 0.05 ct). Convert Centigrams to Carats with formula, table, and examples.

One centigram equals exactly 0.05 carats. Since a carat is defined as 200 milligrams (0.2 grams) and a centigram is 10 milligrams (0.01 grams), the ratio is simply 0.01 divided by 0.2, giving a clean 0.05. Put differently, exactly 20 centigrams make one carat - a tidy relationship that comes from the carat being deliberately standardized in metric terms.

How to Convert Centigrams to Carats

ct = cg ÷ 20

Divide the value in Centigrams by 20

Take your value in Centigrams
Divide by 20
Read the result in Carats

Common Centigrams to Carats Conversions

Centigrams (cg)	Carats (ct)	Status
1 cg	0.05 ct
2 cg	0.1 ct
5 cg	0.25 ct
10 cg	0.5 ct
20 cg	1 ct
50 cg	2.5 ct
100 cg	5 ct
200 cg	10 ct
500 cg	25 ct
1,000 cg	50 ct
2,000 cg	100 ct
5,000 cg	250 ct
10,000 cg	500 ct
50,000 cg	2,500 ct
100,000 cg	5,000 ct

Good to Know About Centigrams to Carats Conversion

The centigram and the carat share an interesting parallel: both are 'centi-' scale measurements in their respective domains. The centigram is one hundredth of a gram, while the carat's own subdivision - the 'point' - is one hundredth of a carat. This means 1 point equals 0.2 centigrams, creating a nested system of hundredths that the 1907 standardization committee probably did not intend but mathematicians can appreciate.

Centigrams to Carats: What You Need to Know

This conversion is relevant when laboratory instruments display readings in centigrams but the user needs a gemstone weight in carats. Older European analytical balances sometimes defaulted to centigram resolution, and pharmacists in some traditions recorded measurements this way. A typical 1-carat engagement diamond reads as 20 centigrams on such a scale, while a 0.5-carat stone registers as exactly 10 centigrams.

What is a Centigram? cg

A centigram is one hundredth of a gram. It is a metric unit rarely used in everyday life but appears in some scientific and educational contexts.

Metric scientific measurement education

Learn more about Centigram →

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 →

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

Centigrams to Carats FAQ

One carat equals exactly 20 centigrams. This comes from 1 carat being 0.2 grams (200 milligrams) and 1 centigram being 0.01 grams (10 milligrams): 200 divided by 10 equals 20.
This conversion arises when using laboratory scales that display in centigrams, reading historical pharmaceutical records that recorded gemstone weights in metric sub-units, or converting between European scientific notation and gemological terminology.
Yes. The centigram (cg) is a standard SI-compatible unit equal to one hundredth of a gram. It follows the same prefix logic as centimeter (one hundredth of a meter). However, it is rarely used in practice, with milligrams and grams preferred for most applications.

Non-Frequently Asked Questions About Centigrams to Carats

Questions nobody should ask - but someone did.

At one centigram per day, reaching 20 centigrams (1 carat or 0.2 grams) takes exactly 20 days. But gold is priced by troy ounces, not carats, so your 0.2-gram gold stash would be worth about 13 dollars. The patience required vastly exceeds the payoff.
Almost certainly not. The difference is 1 centigram (10 milligrams), roughly the weight of two grains of salt. Humans can typically detect weight differences starting at about 1 gram (100 centigrams) when holding small objects. Your palm is a poor substitute for a gem scale.
It is impressively clean: multiply by 0.05 or divide by 20. The only conversion that might rival it for neatness is carats to decigrams (multiply by 2). These tidy ratios exist because the metric carat was standardized at exactly 200 milligrams - a number chosen partly for its compatibility with the decimal system.