Femtosecond is 1e-15 second units.
Femtoseconds to Yoctoseconds Converter — fs to ys
Convert Femtosecond (fs) to Yoctosecond (ys) using the exact conversion factor (1 femtosecond = 1,000,000,000 yoctosecond). See the formula, worked examples, and conversion table.
Femtoseconds to Yoctoseconds 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.
Yoctosecond is 1e-24 second units.
Result = input x 1e-15 / 1e-24.
Months and years use the average Gregorian year.
Reserved above the conversion cards and below the converter.
About Converting Femtoseconds to Yoctoseconds
Femtosecond and Yoctosecond 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 yoctosecond is 1e-24 second units.
Formula
yoctoseconds = femtoseconds × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 femtosecond equals 1e-15 base units, and 1 yoctosecond equals 1e-24 base units, so dividing one by the other gives the direct femtosecond-to-yoctosecond factor of 1000000000.
Simple example
1 fs × 1000000000 = 1,000,000,000 ys
1 femtosecond = 1,000,000,000 yoctoseconds.
Real-world example
24 fs × 1000000000 = 24,000,000,000 ys
24 femtoseconds = 24,000,000,000 yoctoseconds.
Conversion table
| Femtosecond (fs) | Yoctosecond (ys) |
|---|---|
| 1 fs | 1,000,000,000 ys |
| 7 fs | 7,000,000,000 ys |
| 24 fs | 24,000,000,000 ys |
| 30 fs | 30,000,000,000 ys |
| 100 fs | 100,000,000,000 ys |
| 365 fs | 365,000,000,000 ys |
Reverse conversion: Yoctosecond to Femtosecond
1 ys × 1e-9 = 1e-9 fs
1 yoctosecond = 1e-9 femtoseconds.
femtoseconds = yoctoseconds × 1e-9
For a page dedicated to this direction, see Yoctosecond to Femtosecond.
Understanding the Femtosecond (fs)
Femtosecond is 1e-15 second units.
Understanding the Yoctosecond (ys)
Yoctosecond is 1e-24 second units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many yoctoseconds are in 1 femtosecond?
1 femtosecond equals 1,000,000,000 yoctoseconds, using the exact defined conversion factor rather than an estimate.
How do I convert femtosecond to yoctosecond?
Multiply the femtosecond value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert yoctosecond back to femtosecond?
Use the reverse factor: 1 yoctosecond equals 1e-9 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 yoctosecond?
Yoctosecond (ys) is a unit of time.
Is the femtosecond to yoctosecond conversion exact?
Yes. Both femtosecond and yoctosecond are defined by fixed standards rather than physical artifacts, so the factor of 1000000000 used above is exact to as many digits as you choose to display.