A metric carat is exactly 200 milligrams.
Carats to Micrograms Converter — ct to ug
Convert Carat (ct) to Microgram (ug) using the exact conversion factor (1 carat = 200,000 microgram). See the formula, worked examples, and conversion table.
Carats to Micrograms 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.
Microgram is 0.000001 gram units.
Result = input x 0.0002 / 1e-9.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Carats to Micrograms
Weight conversions between Carat and Microgram 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 microgram is 0.000001 gram units.
Formula
micrograms = carats × 200000
This factor comes from each unit's defined relationship to the category's base unit: 1 carat equals 0.0002 base units, and 1 microgram equals 1e-9 base units, so dividing one by the other gives the direct carat-to-microgram factor of 200000.
Simple example
1 ct × 200000 = 200,000 ug
1 carat = 200,000 micrograms.
Real-world example
50 ct × 200000 = 10,000,000 ug
50 carats = 10,000,000 micrograms.
Conversion table
| Carat (ct) | Microgram (ug) |
|---|---|
| 1 ct | 200,000 ug |
| 5 ct | 1,000,000 ug |
| 10 ct | 2,000,000 ug |
| 25 ct | 5,000,000 ug |
| 50 ct | 10,000,000 ug |
| 100 ct | 20,000,000 ug |
Reverse conversion: Microgram to Carat
1 ug × 0.000005 = 0.000005 ct
1 microgram = 0.000005 carats.
carats = micrograms × 0.000005
For a page dedicated to this direction, see Microgram to Carat.
Understanding the Carat (ct)
A metric carat is exactly 200 milligrams.
Understanding the Microgram (ug)
Microgram is 0.000001 gram units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many micrograms are in 1 carat?
1 carat equals 200,000 micrograms, using the exact defined conversion factor rather than an estimate.
How do I convert carat to microgram?
Multiply the carat value by 200000. The converter above does this instantly to whatever precision you set.
How do I convert microgram back to carat?
Use the reverse factor: 1 microgram equals 0.000005 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 microgram?
Microgram (ug) is a unit of mass/weight.
Is the carat to microgram conversion exact?
Yes. Both carat and microgram are defined by fixed standards rather than physical artifacts, so the factor of 200000 used above is exact to as many digits as you choose to display.