Microseconds to Femtoseconds Converter
Enter the time in microseconds below to convert it to femtoseconds.
Convert Microseconds to Femtoseconds
Enter a value in microseconds (µs) to convert to femtoseconds (fs).
Microsecond to Femtosecond Conversion Table
Table showing various microsecond measurements converted to femtoseconds. Click any preset value or arrow to load it into the converter.
How to Convert Microseconds to Femtoseconds
To convert microseconds to femtoseconds, multiply the time by the following conversion ratio: 999,999,999.9999999 femtoseconds/microsecond.
Since one microsecond is equal to 999,999,999.9999999 femtoseconds, you can use this simple formula to convert:
The time in femtoseconds is equal to the time in microseconds multiplied by 999,999,999.9999999.
For example, here's how to convert 5 microseconds to femtoseconds using the formula above.
How Many Femtoseconds Are in a Microsecond?
There are 999,999,999.9999999 femtoseconds in a microsecond, which is why we use this value in the formula above.
Our microsecond to femtosecond calculator automatically converts your time measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Microseconds and femtoseconds are both units used to measure time. Keep reading to learn more about each unit.
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). [1]
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.
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. [2]
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.
When converting time between microseconds (µs) and femtoseconds (fs), keep full floating-point precision (1 µs = 999,999,999.9999999 fs; 1 fs = 1e-9 µs) during intermediate calculations and round only the final femtosecond figure to match your instrument tolerance.
More Microsecond & Femtosecond Conversions
Need to calculate in the opposite direction? Use our femtoseconds to microseconds calculator to switch your starting unit immediately. You can also explore related tools such as converting femtoseconds to microseconds, converting seconds to minutes, or converting seconds to milliseconds.
Convert from Microseconds
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Time)·Time Metrology Standard — Microseconds (µs) to Femtoseconds (fs)
- [2]BIPM SpecificationBIPM (SI Base Unit: Second (s))·Unit Specifications: Microsecond (µs) & Femtosecond (fs)
- [3]NIST CUU ReferenceNIST CUU (Non-SI Units Accepted for Use (min, h, d))·Conversion Factors & Mathematical Basis (µs to fs)