Enter the speed of light and wavelength into the calculator to determine the frequency in Hertz. This calculator can also evaluate any of the variables given the others are known.

Mm To Hz Calculator

Vacuum (Basic)
Custom Medium / Speed

Enter either Wavelength or Frequency to calculate the missing value (in vacuum).

Mm To Hz Formula

The following formula is used to calculate the frequency in Hertz from the wavelength in millimeters.

f = c / λ

Variables:

  • f is the frequency in Hertz (Hz)
  • c is the speed of light (299,792,458 meters per second)
  • λ is the wavelength in millimeters (mm)

To calculate the frequency in Hertz, divide the speed of light by the wavelength in millimeters. Note that the speed of light is a constant value, and the wavelength must be converted from millimeters to meters (1mm = 0.001m) before performing the calculation.

Millimeters to Hertz Conversion Table (Vacuum, c = 299,792,458 m/s)
Wavelength (mm) Frequency (GHz) Frequency (Hz)
0.5599.585599584916000
1299.792299792458000
1.25239.834239833966400
1.5199.862199861638667
2149.896149896229000
2.5119.917119916983200
399.93199930819333
474.94874948114500
559.95859958491600
649.96549965409667
7.539.97239972327733
837.47437474057250
933.31033310273111
1029.97929979245800
12.523.98323983396640
1519.98619986163867
2014.99014989622900
2511.99211991698320
505.9965995849160
1002.9982997924580
*Assumes electromagnetic waves in vacuum. Formula: f = c / λ, with λ in meters (1 mm = 1×10⁻³ m). 1 mm ≈ 299.792458 GHz.

What is a Mm To Hz?

Mm to Hz refers to the conversion from millimeters (mm), a unit of length, to Hertz (Hz), a unit of frequency. This conversion is typically used in the context of electromagnetic waves, such as light or radio waves, where the wavelength of the wave (measured in millimeters) is inversely proportional to its frequency (measured in Hertz). Therefore, a wave with a shorter wavelength will have a higher frequency, and vice versa.

How to Calculate Mm To Hz?

The following steps outline how to calculate the Mm To Hz using the formula: f = c / λ


  1. First, determine the wavelength in millimeters (λ).
  2. Next, determine the speed of light (c) in meters per second.
  3. Next, use the formula f = c / λ to calculate the frequency in Hertz (Hz).
  4. Finally, calculate the Mm To Hz.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

wavelength in millimeters (λ) = 10

speed of light (c) = 299,792,458 meters per second