Femtoseconds to Planck Times Converter
Enter the time in femtoseconds below to convert it to planck times.
Convert Femtoseconds to Planck Times
Enter a value in femtoseconds (fs) to convert to planck times (tₚ).
Femtosecond to Planck Time Conversion Table
Table showing various femtosecond measurements converted to planck times. Click any preset value or arrow to load it into the converter.
| Femtoseconds (fs) | Planck Times (tₚ) |
|---|---|
| 0.0000001 fs | 1.854858e+21 tₚ |
| 0.0000002 fs | 3.709717e+21 tₚ |
| 0.0000003 fs | 5.564575e+21 tₚ |
| 0.0000004 fs | 7.419434e+21 tₚ |
| 0.0000005 fs | 9.274292e+21 tₚ |
| 0.0000006 fs | 1.112915e+22 tₚ |
| 0.0000007 fs | 1.298401e+22 tₚ |
| 0.0000008 fs | 1.483887e+22 tₚ |
| 0.0000009 fs | 1.669373e+22 tₚ |
| 0.00000001 fs | 1.854858e+20 tₚ |
How to Convert Femtoseconds to Planck Times
To convert femtoseconds to planck times, multiply the time by the following conversion ratio: 1.854858e+28 planck times/femtosecond.
Since one femtosecond is equal to 1.854858e+28 planck times, you can use this simple formula to convert:
The time in planck times is equal to the time in femtoseconds multiplied by 1.854858e+28.
For example, here's how to convert 5 femtoseconds to planck times using the formula above.
How Many Planck Times Are in a Femtosecond?
There are 1.854858e+28 planck times in a femtosecond, which is why we use this value in the formula above.
Our femtosecond to planck time calculator automatically converts your time measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Femtoseconds and planck times 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 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). [2]
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.
When converting time between femtoseconds (fs) and planck times (tₚ), keep full floating-point precision (1 fs = 1.854858e+28 tₚ; 1 tₚ = 5.391247e-29 fs) during intermediate calculations and round only the final planck time figure to match your instrument tolerance.
More Femtosecond & Planck Time Conversions
Need to calculate in the opposite direction? Use our planck times to femtoseconds calculator to switch your starting unit immediately. You can also explore related tools such as converting planck times 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 Planck Times (tₚ)
- [2]BIPM SpecificationBIPM (SI Base Unit: Second (s))·Unit Specifications: Femtosecond (fs) & Planck Time (tₚ)
- [3]NIST CUU ReferenceNIST CUU (Non-SI Units Accepted for Use (min, h, d))·Conversion Factors & Mathematical Basis (fs to tₚ)