Femtogram is 1e-15 gram units.
Femtograms to Carats Converter — fg to ct
Convert Femtogram (fg) to Carat (ct) using the exact conversion factor (1 femtogram = 5e-15 carat). See the formula, worked examples, and conversion table.
Femtograms to Carats 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.
A metric carat is exactly 200 milligrams.
Result = input x 1e-18 / 0.0002.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Femtograms to Carats
Weight conversions between Femtogram and Carat 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: Femtogram is 1e-15 gram units, and a metric carat is exactly 200 milligrams.
Formula
carats = femtograms × 5e-15
This factor comes from each unit's defined relationship to the category's base unit: 1 femtogram equals 1e-18 base units, and 1 carat equals 0.0002 base units, so dividing one by the other gives the direct femtogram-to-carat factor of 5e-15.
Simple example
1 fg × 5e-15 = 5e-15 ct
1 femtogram = 5e-15 carats.
Real-world example
50 fg × 5e-15 = 2.5e-13 ct
50 femtograms = 2.5e-13 carats.
Conversion table
| Femtogram (fg) | Carat (ct) |
|---|---|
| 1 fg | 5e-15 ct |
| 5 fg | 2.5e-14 ct |
| 10 fg | 5e-14 ct |
| 25 fg | 1.25e-13 ct |
| 50 fg | 2.5e-13 ct |
| 100 fg | 5e-13 ct |
Reverse conversion: Carat to Femtogram
5e-15 ct × 2e+14 = 1 fg
5e-15 carats = 1 femtogram.
femtograms = carats × 2e+14
For a page dedicated to this direction, see Carat to Femtogram.
Understanding the Femtogram (fg)
Femtogram is 1e-15 gram units.
Understanding the Carat (ct)
A metric carat is exactly 200 milligrams.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many carats are in 1 femtogram?
1 femtogram equals 5e-15 carats, using the exact defined conversion factor rather than an estimate.
How do I convert femtogram to carat?
Multiply the femtogram value by 5e-15. The converter above does this instantly to whatever precision you set.
How do I convert carat back to femtogram?
Use the reverse factor: 1 carat equals 2e+14 femtograms. You can also use the swap control in the converter above to flip the direction instantly.
What is a femtogram?
Femtogram (fg) is a unit of mass/weight.
What is a carat?
Carat (ct) is a unit of mass/weight.
Is the femtogram to carat conversion exact?
Yes. Both femtogram and carat are defined by fixed standards rather than physical artifacts, so the factor of 5e-15 used above is exact to as many digits as you choose to display.