Femtoseconds to Microseconds Converter
Enter the time in femtoseconds below to convert it to microseconds.
Convert Femtoseconds to Microseconds
Enter a value in femtoseconds (fs) to convert to microseconds (µs).
Femtosecond to Microsecond Conversion Table
Table showing various femtosecond measurements converted to microseconds. Click any preset value or arrow to load it into the converter.
| Femtoseconds (fs) | Microseconds (µs) |
|---|---|
| 1 fs | 1e-9 µs |
| 10 fs | 0.00000001 µs |
| 100 fs | 0.0000001 µs |
| 1,000 fs | 0.000001 µs |
| 10,000 fs | 0.00001 µs |
| 100,000 fs | 0.0001 µs |
| 1,000,000 fs | 0.001 µs |
| 5,000,000 fs | 0.005 µs |
| 10,000,000 fs | 0.01 µs |
| 25,400,000 fs | 0.0254 µs |
How to Convert Femtoseconds to Microseconds
To convert femtoseconds to microseconds, multiply the time by the following conversion ratio: 1e-9 microseconds/femtosecond.
Since one femtosecond is equal to 1e-9 microseconds, you can use this simple formula to convert:
The time in microseconds is equal to the time in femtoseconds multiplied by 1e-9.
For example, here's how to convert 5 femtoseconds to microseconds using the formula above.
How Many Microseconds Are in a Femtosecond?
There are 1e-9 microseconds in a femtosecond, which is why we use this value in the formula above.
Our femtosecond to microsecond calculator automatically converts your time measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Femtoseconds and microseconds are both units used to measure time. Keep reading to learn more about each unit.
What Is a Femtosecond?
A femtosecond is a unit of time equal to 1e-15 seconds (s), the base unit for time. One-quadrillionth of a second (10⁻¹⁵ s), used in ultrafast laser physics. [1]
The femtosecond is classified as a metric and SI-compatible unit of time. Femtoseconds can be abbreviated as fs; for example, 1 femtosecond can be written as 1 fs.
In the metric system, "femto" is the standard SI prefix for quadrillionths, or 10⁻¹⁵. This makes the femtosecond (fs) a convenient decimal multiple of the second (s).
In practice, femtoseconds (fs) are widely used across fine-tolerance laboratory, analytical, and micro-scale time measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Microsecond?
A microsecond is a unit of time equal to 1/1,000,000 of a second (0.000001 s). One-millionth of a second (10⁻⁶ s). [2]
The microsecond is classified as a metric and SI-compatible unit of time. Microseconds can be abbreviated as µs; for example, 1 microsecond can be written as 1 µs.
In the metric system, "micro" is the standard SI prefix for millionths, or 10⁻⁶. This makes the microsecond (µs) a convenient decimal multiple of the second (s).
In practice, microseconds (µs) are widely used across fine-tolerance laboratory, analytical, and micro-scale time measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting time between femtoseconds (fs) and microseconds (µs), keep full floating-point precision (1 fs = 1e-9 µs; 1 µs = 999,999,999.9999999 fs) during intermediate calculations and round only the final microsecond figure to match your instrument tolerance.
More Femtosecond & Microsecond Conversions
Need to calculate in the opposite direction? Use our microseconds to femtoseconds calculator to switch your starting unit immediately. You can also explore related tools such as converting microseconds to femtoseconds, converting seconds to minutes, or converting seconds to milliseconds.
Convert from Femtoseconds
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Time)·Time Metrology Standard — Femtoseconds (fs) to Microseconds (µs)
- [2]BIPM SpecificationBIPM (SI Base Unit: Second (s))·Unit Specifications: Femtosecond (fs) & Microsecond (µs)
- [3]NIST CUU ReferenceNIST CUU (Non-SI Units Accepted for Use (min, h, d))·Conversion Factors & Mathematical Basis (fs to µs)