Femtosecond is 1e-15 second units.
Femtoseconds to Zeptoseconds Converter — fs to zs
Convert Femtosecond (fs) to Zeptosecond (zs) using the exact conversion factor (1 femtosecond = 1,000,000 zeptosecond). See the formula, worked examples, and conversion table.
Femtoseconds to Zeptoseconds converter
Converter
Time Converter
Convert SI time, civil time, historical durations, months, and years.
Context values
Some unit families need one extra value for a physically accurate result.
Zeptosecond is 1e-21 second units.
Result = input x 1e-15 / 1e-21.
Months and years use the average Gregorian year.
Reserved above the conversion cards and below the converter.
About Converting Femtoseconds to Zeptoseconds
Femtosecond and Zeptosecond are both everyday units of duration, and converting between them is one of the most routine calculations there is — scheduling, project planning, and billing all depend on it. Specifically: Femtosecond is 1e-15 second units, and zeptosecond is 1e-21 second units.
Formula
zeptoseconds = femtoseconds × 1000000
This factor comes from each unit's defined relationship to the category's base unit: 1 femtosecond equals 1e-15 base units, and 1 zeptosecond equals 1e-21 base units, so dividing one by the other gives the direct femtosecond-to-zeptosecond factor of 1000000.
Simple example
1 fs × 1000000 = 1,000,000 zs
1 femtosecond = 1,000,000 zeptoseconds.
Real-world example
24 fs × 1000000 = 24,000,000 zs
24 femtoseconds = 24,000,000 zeptoseconds.
Conversion table
| Femtosecond (fs) | Zeptosecond (zs) |
|---|---|
| 1 fs | 1,000,000 zs |
| 7 fs | 7,000,000 zs |
| 24 fs | 24,000,000 zs |
| 30 fs | 30,000,000 zs |
| 100 fs | 100,000,000 zs |
| 365 fs | 365,000,000 zs |
Reverse conversion: Zeptosecond to Femtosecond
1 zs × 1e-6 = 1e-6 fs
1 zeptosecond = 1e-6 femtoseconds.
femtoseconds = zeptoseconds × 1e-6
For a page dedicated to this direction, see Zeptosecond to Femtosecond.
Understanding the Femtosecond (fs)
Femtosecond is 1e-15 second units.
Understanding the Zeptosecond (zs)
Zeptosecond is 1e-21 second units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zeptoseconds are in 1 femtosecond?
1 femtosecond equals 1,000,000 zeptoseconds, using the exact defined conversion factor rather than an estimate.
How do I convert femtosecond to zeptosecond?
Multiply the femtosecond value by 1000000. The converter above does this instantly to whatever precision you set.
How do I convert zeptosecond back to femtosecond?
Use the reverse factor: 1 zeptosecond equals 1e-6 femtoseconds. You can also use the swap control in the converter above to flip the direction instantly.
What is a femtosecond?
Femtosecond (fs) is a unit of time.
What is a zeptosecond?
Zeptosecond (zs) is a unit of time.
Is the femtosecond to zeptosecond conversion exact?
Yes. Both femtosecond and zeptosecond are defined by fixed standards rather than physical artifacts, so the factor of 1000000 used above is exact to as many digits as you choose to display.