Femtosecond is 1e-15 second units.
Femtoseconds to Nanoseconds Converter — fs to ns
Convert Femtosecond (fs) to Nanosecond (ns) using the exact conversion factor (1 femtosecond = 0.000001 nanosecond). See the formula, worked examples, and conversion table.
Femtoseconds to Nanoseconds 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.
Nanosecond is 1e-9 second units.
Result = input x 1e-15 / 1e-9.
Months and years use the average Gregorian year.
Reserved above the conversion cards and below the converter.
About Converting Femtoseconds to Nanoseconds
Femtosecond and Nanosecond 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 nanosecond is 1e-9 second units.
Formula
nanoseconds = femtoseconds × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 femtosecond equals 1e-15 base units, and 1 nanosecond equals 1e-9 base units, so dividing one by the other gives the direct femtosecond-to-nanosecond factor of 0.000001.
Simple example
1 fs × 0.000001 = 0.000001 ns
1 femtosecond = 0.000001 nanoseconds.
Real-world example
24 fs × 0.000001 = 0.000024 ns
24 femtoseconds = 0.000024 nanoseconds.
Conversion table
| Femtosecond (fs) | Nanosecond (ns) |
|---|---|
| 1 fs | 0.000001 ns |
| 7 fs | 0.000007 ns |
| 24 fs | 0.000024 ns |
| 30 fs | 0.00003 ns |
| 100 fs | 0.0001 ns |
| 365 fs | 0.000365 ns |
Reverse conversion: Nanosecond to Femtosecond
0.000001 ns × 1000000 = 1 fs
0.000001 nanoseconds = 1 femtosecond.
femtoseconds = nanoseconds × 1000000
For a page dedicated to this direction, see Nanosecond to Femtosecond.
Understanding the Femtosecond (fs)
Femtosecond is 1e-15 second units.
Understanding the Nanosecond (ns)
Nanosecond is 1e-9 second units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanoseconds are in 1 femtosecond?
1 femtosecond equals 0.000001 nanoseconds, using the exact defined conversion factor rather than an estimate.
How do I convert femtosecond to nanosecond?
Multiply the femtosecond value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert nanosecond back to femtosecond?
Use the reverse factor: 1 nanosecond equals 1,000,000 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 nanosecond?
Nanosecond (ns) is a unit of time.
Is the femtosecond to nanosecond conversion exact?
Yes. Both femtosecond and nanosecond 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.