A metric carat is exactly 200 milligrams.
Carats to Nanograms Converter — ct to ng
Convert Carat (ct) to Nanogram (ng) using the exact conversion factor (1 carat = 200,000,000 nanogram). See the formula, worked examples, and conversion table.
Carats to Nanograms 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.
Nanogram is 1e-9 gram units.
Result = input x 0.0002 / 1e-12.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Carats to Nanograms
Weight conversions between Carat and Nanogram 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 nanogram is 1e-9 gram units.
Formula
nanograms = carats × 200000000
This factor comes from each unit's defined relationship to the category's base unit: 1 carat equals 0.0002 base units, and 1 nanogram equals 1e-12 base units, so dividing one by the other gives the direct carat-to-nanogram factor of 200000000.
Simple example
1 ct × 200000000 = 200,000,000 ng
1 carat = 200,000,000 nanograms.
Real-world example
50 ct × 200000000 = 10,000,000,000 ng
50 carats = 10,000,000,000 nanograms.
Conversion table
| Carat (ct) | Nanogram (ng) |
|---|---|
| 1 ct | 200,000,000 ng |
| 5 ct | 1,000,000,000 ng |
| 10 ct | 2,000,000,000 ng |
| 25 ct | 5,000,000,000 ng |
| 50 ct | 10,000,000,000 ng |
| 100 ct | 20,000,000,000 ng |
Reverse conversion: Nanogram to Carat
1 ng × 5e-9 = 5e-9 ct
1 nanogram = 5e-9 carats.
carats = nanograms × 5e-9
For a page dedicated to this direction, see Nanogram to Carat.
Understanding the Carat (ct)
A metric carat is exactly 200 milligrams.
Understanding the Nanogram (ng)
Nanogram is 1e-9 gram units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanograms are in 1 carat?
1 carat equals 200,000,000 nanograms, using the exact defined conversion factor rather than an estimate.
How do I convert carat to nanogram?
Multiply the carat value by 200000000. The converter above does this instantly to whatever precision you set.
How do I convert nanogram back to carat?
Use the reverse factor: 1 nanogram equals 5e-9 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 nanogram?
Nanogram (ng) is a unit of mass/weight.
Is the carat to nanogram conversion exact?
Yes. Both carat and nanogram are defined by fixed standards rather than physical artifacts, so the factor of 200000000 used above is exact to as many digits as you choose to display.