Milliseconds to Femtoseconds Converter
Enter the time in milliseconds below to convert it to femtoseconds.
Convert Milliseconds to Femtoseconds
Enter a value in milliseconds (ms) to convert to femtoseconds (fs).
Millisecond to Femtosecond Conversion Table
Table showing various millisecond measurements converted to femtoseconds. Click any preset value or arrow to load it into the converter.
| Milliseconds (ms) | Femtoseconds (fs) |
|---|---|
| 0.0000001 ms | 100,000 fs |
| 0.0000002 ms | 200,000 fs |
| 0.0000003 ms | 300,000 fs |
| 0.0000004 ms | 400,000 fs |
| 0.0000005 ms | 500,000 fs |
| 0.0000006 ms | 600,000 fs |
| 0.0000007 ms | 700,000 fs |
| 0.0000008 ms | 800,000 fs |
| 0.0000009 ms | 900,000 fs |
| 0.00000001 ms | 10,000 fs |
How to Convert Milliseconds to Femtoseconds
To convert milliseconds to femtoseconds, multiply the time by the following conversion ratio: 1e+12 femtoseconds/millisecond.
Since one millisecond is equal to 1e+12 femtoseconds, you can use this simple formula to convert:
The time in femtoseconds is equal to the time in milliseconds multiplied by 1e+12.
For example, here's how to convert 5 milliseconds to femtoseconds using the formula above.
How Many Femtoseconds Are in a Millisecond?
There are 1e+12 femtoseconds in a millisecond, which is why we use this value in the formula above.
Our millisecond to femtosecond calculator automatically converts your time measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milliseconds and femtoseconds are both units used to measure time. Keep reading to learn more about each unit.
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). [1]
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.
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 milliseconds (ms) and femtoseconds (fs), keep full floating-point precision (1 ms = 1e+12 fs; 1 fs = 1e-12 ms) during intermediate calculations and round only the final femtosecond figure to match your instrument tolerance.
More Millisecond & Femtosecond Conversions
Need to calculate in the opposite direction? Use our femtoseconds to milliseconds calculator to switch your starting unit immediately. You can also explore related tools such as converting femtoseconds to milliseconds, converting milliseconds to seconds, or converting seconds to minutes.
Convert from Milliseconds
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Time)·Time Metrology Standard — Milliseconds (ms) to Femtoseconds (fs)
- [2]BIPM SpecificationBIPM (SI Base Unit: Second (s))·Unit Specifications: Millisecond (ms) & Femtosecond (fs)
- [3]NIST CUU ReferenceNIST CUU (Non-SI Units Accepted for Use (min, h, d))·Conversion Factors & Mathematical Basis (ms to fs)