Planck Times to Femtoseconds Converter
Enter the time in planck times below to convert it to femtoseconds.
Convert Planck Times to Femtoseconds
Enter a value in planck times (tₚ) to convert to femtoseconds (fs).
Planck Time to Femtosecond Conversion Table
Table showing various planck time measurements converted to femtoseconds. Click any preset value or arrow to load it into the converter.
| Planck Times (tₚ) | Femtoseconds (fs) |
|---|---|
| 1 tₚ | 5.391247e-29 fs |
| 10 tₚ | 5.391247e-28 fs |
| 100 tₚ | 5.391247e-27 fs |
| 1,000 tₚ | 5.391247e-26 fs |
| 10,000 tₚ | 5.391247e-25 fs |
| 100,000 tₚ | 5.391247e-24 fs |
| 1,000,000 tₚ | 5.391247e-23 fs |
| 5,000,000 tₚ | 2.695623e-22 fs |
| 10,000,000 tₚ | 5.391247e-22 fs |
| 25,400,000 tₚ | 1.369377e-21 fs |
How to Convert Planck Times to Femtoseconds
To convert planck times to femtoseconds, multiply the time by the following conversion ratio: 5.391247e-29 femtoseconds/planck time.
Since one planck time is equal to 5.391247e-29 femtoseconds, you can use this simple formula to convert:
The time in femtoseconds is equal to the time in planck times multiplied by 5.391247e-29.
For example, here's how to convert 5 planck times to femtoseconds using the formula above.
How Many Femtoseconds Are in a Planck Time?
There are 5.391247e-29 femtoseconds in a planck time, which is why we use this value in the formula above.
Our planck time to femtosecond calculator automatically converts your time measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Planck Times and femtoseconds are both units used to measure time. Keep reading to learn more about each unit.
What Is a Planck Time?
A planck time is a unit of time equal to 1/18,548,584,399,861,480,000,000,000,000,000,000,000,000,000 of a second (5.391247e-44 s). Time required for light to travel 1 Planck length in vacuum (~5.39×10⁻⁴⁴ s). [1]
The planck time is classified as a standard unit of time. Planck Times can be abbreviated as tₚ; for example, 1 planck time can be written as 1 tₚ.
When working with planck times (tₚ) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, planck times (tₚ) are widely used across fine-tolerance laboratory, analytical, and micro-scale time measurements within international standard 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 planck times (tₚ) and femtoseconds (fs), keep full floating-point precision (1 tₚ = 5.391247e-29 fs; 1 fs = 1.854858e+28 tₚ) during intermediate calculations and round only the final femtosecond figure to match your instrument tolerance.
More Planck Time & Femtosecond Conversions
Need to calculate in the opposite direction? Use our femtoseconds to planck times calculator to switch your starting unit immediately. You can also explore related tools such as converting femtoseconds to planck times, converting seconds to minutes, or converting seconds to milliseconds.
Convert from Planck Times
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Time)·Time Metrology Standard — Planck Times (tₚ) to Femtoseconds (fs)
- [2]BIPM SpecificationBIPM (SI Base Unit: Second (s))·Unit Specifications: Planck Time (tₚ) & Femtosecond (fs)
- [3]NIST CUU ReferenceNIST CUU (Non-SI Units Accepted for Use (min, h, d))·Conversion Factors & Mathematical Basis (tₚ to fs)