Photon Momentum Calculator


Calculating photon momentum is essential in various scientific and engineering fields, particularly in optics and quantum mechanics. A photon, being a fundamental particle of light, carries momentum proportional to its frequency and wavelength. This article provides a simple yet accurate method to calculate photon momentum using the appropriate formula.

How to Use

To calculate photon momentum, input the values of frequency or wavelength into the corresponding fields below. Then, click the “Calculate” button to obtain the result.


The formula to calculate photon momentum is given by:


  • p is the momentum of the photon.
  • h is Planck’s constant (6.62607015×10−346.62607015×10−34 m² kg / s).
  • f is the frequency of the photon (Hz).
  • c is the speed of light in a vacuum (2.998×1082.998×108 m/s).

Example Solve

Let’s say we have a photon with a frequency of 5×1014 Hz. We can calculate its momentum using the formula mentioned above:

By performing the calculation, we find:


Q: What are the units of photon momentum?
A: Photon momentum is typically measured in kilograms meters per second (kg m/s), consistent with other momentum units.

Q: Can I calculate photon momentum using wavelength instead of frequency?
A: Yes, you can use either frequency or wavelength in the formula, as they are inversely proportional (by the speed of light).

Q: Why is calculating photon momentum important?
A: Understanding photon momentum is crucial in various fields, including optics, quantum mechanics, and photonics, as it helps in analyzing light-matter interactions and designing optical devices.


Calculating photon momentum is fundamental in understanding the behavior of light and its interactions with matter. By utilizing the provided formula and example, you can accurately determine the momentum of photons based on their frequency or wavelength.

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