A metric carat is exactly 200 milligrams.
Carats to Centigrams Converter — ct to cg
Convert Carat (ct) to Centigram (cg) using the exact conversion factor (1 carat = 20 centigram). See the formula, worked examples, and conversion table.
Carats to Centigrams converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
Centigram is 0.01 gram units.
Result = input x 0.0002 / 1e-5.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Carats to Centigrams
Weight conversions between Carat and Centigram come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Specifically: A metric carat is exactly 200 milligrams, and centigram is 0.01 gram units.
Formula
centigrams = carats × 20
This factor comes from each unit's defined relationship to the category's base unit: 1 carat equals 0.0002 base units, and 1 centigram equals 0.00001 base units, so dividing one by the other gives the direct carat-to-centigram factor of 20.
Simple example
1 ct × 20 = 20 cg
1 carat = 20 centigrams.
Real-world example
50 ct × 20 = 1,000 cg
50 carats = 1,000 centigrams.
Conversion table
| Carat (ct) | Centigram (cg) |
|---|---|
| 1 ct | 20 cg |
| 5 ct | 100 cg |
| 10 ct | 200 cg |
| 25 ct | 500 cg |
| 50 ct | 1,000 cg |
| 100 ct | 2,000 cg |
Reverse conversion: Centigram to Carat
20 cg × 0.05 = 1 ct
20 centigrams = 1 carat.
carats = centigrams × 0.05
For a page dedicated to this direction, see Centigram to Carat.
Understanding the Carat (ct)
A metric carat is exactly 200 milligrams.
Understanding the Centigram (cg)
Centigram is 0.01 gram units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many centigrams are in 1 carat?
1 carat equals 20 centigrams, using the exact defined conversion factor rather than an estimate.
How do I convert carat to centigram?
Multiply the carat value by 20. The converter above does this instantly to whatever precision you set.
How do I convert centigram back to carat?
Use the reverse factor: 1 centigram equals 0.05 carats. You can also use the swap control in the converter above to flip the direction instantly.
What is a carat?
Carat (ct) is a unit of mass/weight.
What is a centigram?
Centigram (cg) is a unit of mass/weight.
Is the carat to centigram conversion exact?
Yes. Both carat and centigram are defined by fixed standards rather than physical artifacts, so the factor of 20 used above is exact to as many digits as you choose to display.