Femtoseconds to Milliseconds Converter
Enter the time in femtoseconds below to convert it to milliseconds.
Convert Femtoseconds to Milliseconds
Enter a value in femtoseconds (fs) to convert to milliseconds (ms).
Femtosecond to Millisecond Conversion Table
Table showing various femtosecond measurements converted to milliseconds. Click any preset value or arrow to load it into the converter.
| Femtoseconds (fs) | Milliseconds (ms) |
|---|---|
| 1 fs | 1e-12 ms |
| 10 fs | 1e-11 ms |
| 100 fs | 1e-10 ms |
| 1,000 fs | 1e-9 ms |
| 10,000 fs | 0.00000001 ms |
| 100,000 fs | 0.0000001 ms |
| 1,000,000 fs | 0.000001 ms |
| 5,000,000 fs | 0.000005 ms |
| 10,000,000 fs | 0.00001 ms |
| 25,400,000 fs | 0.0000254 ms |
How to Convert Femtoseconds to Milliseconds
To convert femtoseconds to milliseconds, multiply the time by the following conversion ratio: 1e-12 milliseconds/femtosecond.
Since one femtosecond is equal to 1e-12 milliseconds, you can use this simple formula to convert:
The time in milliseconds is equal to the time in femtoseconds multiplied by 1e-12.
For example, here's how to convert 5 femtoseconds to milliseconds using the formula above.
How Many Milliseconds Are in a Femtosecond?
There are 1e-12 milliseconds in a femtosecond, which is why we use this value in the formula above.
Our femtosecond to millisecond calculator automatically converts your time measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Femtoseconds and milliseconds 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 Millisecond?
A millisecond is a unit of time equal to 1/1,000 of a second (0.001 s). One-thousandth of a second (10⁻³ s). [2]
The millisecond is classified as a metric and SI-compatible unit of time. Milliseconds can be abbreviated as ms; for example, 1 millisecond can be written as 1 ms.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millisecond (ms) a convenient decimal multiple of the second (s).
In practice, milliseconds (ms) 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 milliseconds (ms), keep full floating-point precision (1 fs = 1e-12 ms; 1 ms = 1e+12 fs) during intermediate calculations and round only the final millisecond figure to match your instrument tolerance.
More Femtosecond & Millisecond Conversions
Need to calculate in the opposite direction? Use our milliseconds to femtoseconds calculator to switch your starting unit immediately. You can also explore related tools such as converting milliseconds to femtoseconds, converting seconds to milliseconds, or converting seconds to minutes.
Convert from Femtoseconds
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Time)·Time Metrology Standard — Femtoseconds (fs) to Milliseconds (ms)
- [2]BIPM SpecificationBIPM (SI Base Unit: Second (s))·Unit Specifications: Femtosecond (fs) & Millisecond (ms)
- [3]NIST CUU ReferenceNIST CUU (Non-SI Units Accepted for Use (min, h, d))·Conversion Factors & Mathematical Basis (fs to ms)