Zeptogram is 1e-21 gram units.
Zeptograms to Femtograms Converter — zg to fg
Convert Zeptogram (zg) to Femtogram (fg) using the exact conversion factor (1 zeptogram = 0.000001 femtogram). See the formula, worked examples, and conversion table.
Zeptograms to Femtograms 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.
Femtogram is 1e-15 gram units.
Result = input x 1e-24 / 1e-18.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Zeptograms to Femtograms
Weight conversions between Zeptogram and Femtogram 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: Zeptogram is 1e-21 gram units, and femtogram is 1e-15 gram units.
Formula
femtograms = zeptograms × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptogram equals 1e-24 base units, and 1 femtogram equals 1e-18 base units, so dividing one by the other gives the direct zeptogram-to-femtogram factor of 0.000001.
Simple example
1 zg × 0.000001 = 0.000001 fg
1 zeptogram = 0.000001 femtograms.
Real-world example
50 zg × 0.000001 = 0.00005 fg
50 zeptograms = 0.00005 femtograms.
Conversion table
| Zeptogram (zg) | Femtogram (fg) |
|---|---|
| 1 zg | 0.000001 fg |
| 5 zg | 0.000005 fg |
| 10 zg | 0.00001 fg |
| 25 zg | 0.000025 fg |
| 50 zg | 0.00005 fg |
| 100 zg | 0.0001 fg |
Reverse conversion: Femtogram to Zeptogram
0.000001 fg × 1000000 = 1 zg
0.000001 femtograms = 1 zeptograms.
zeptograms = femtograms × 1000000
For a page dedicated to this direction, see Femtogram to Zeptogram.
Understanding the Zeptogram (zg)
Zeptogram is 1e-21 gram units.
Understanding the Femtogram (fg)
Femtogram is 1e-15 gram units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtograms are in 1 zeptogram?
1 zeptogram equals 0.000001 femtograms, using the exact defined conversion factor rather than an estimate.
How do I convert zeptogram to femtogram?
Multiply the zeptogram value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert femtogram back to zeptogram?
Use the reverse factor: 1 femtogram equals 1,000,000 zeptograms. You can also use the swap control in the converter above to flip the direction instantly.
What is a zeptogram?
Zeptogram (zg) is a unit of mass/weight.
What is a femtogram?
Femtogram (fg) is a unit of mass/weight.
Is the zeptogram to femtogram conversion exact?
Yes. Both zeptogram and femtogram are defined by fixed standards rather than physical artifacts, so the factor of 0.000001 used above is exact to as many digits as you choose to display.