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Frequency Calculator


Table of Content


An online frequency calculator lets you quickly find the frequency of a wave, and either the velocity or period. Our frequency to period calculator aids in determining the number of times through which the data value occurs. 

What Is Frequency?

Frequency is the number of complete wave cycles that pass from the place per second. The frequency of a wave tells us how many wave crests pass from the given point in a given amount of time.

The SI unit of the frequency is the hertz (Hz) which corresponds to the number of waveforms that repeat in one second. There are some units in which frequency can be calculated:

  • Cycle per second CPS
  • Revolution per minute rpm
  • Millihertz (mHz)
  • Megahertz (MHz)
  • Kilohertz (kHz)
  • Gigahertz (GHz)
  • Terahertz (THz)

By using our wavelength calculator, you can be able to calculate the wavelength of light in vacuum, air, or water.


The frequency is the number of cycles completed per unit of time. Our frequency calculator enhances precision, streamlines processes, and contributes to numerous disciplines.

To calculate the number of waves frequency of a wave calculator use the following formula.

F = 1 / T


F = Frequency of a wave
T = Taken time to complete one wave cycle

Frequency can also be calculated by taking into account wavelength and velocity.

F = v / λ


  • V is the velocity. The value of velocity is 299,792,458 m/s
  • λ (Lambda) is the distance between the crests and the troughs

Frequency is directly to the velocity and is inversely proportional to the wavelength. Click on to learn what is force and how we calculate force by using a force calculator

How To Calculate Frequency?

The period to frequency calculator is loaded with a user-friendly interface that makes the calculations faster and shows the results within a couple of seconds. But if your goal comes up with manual computations, take a look at a couple of the examples below!

Example # 1

Suppose that the light is travelling through the vacuum and we have to measure its frequency.


You are required to determine the value of v and λ (lambda) of light to calculate the frequency of the light that travels through the vacuum.

V = 299,792,458 m/s

λ = 682899 m


F = v / λ
F = 299,792,458 / 682899 

F = 438 hertz 

Example # 2

If the heartbeat has a frequency of 120 times a minute the period T - finds the interval at which the beat repeats.



 2 Hz 

Working Of Frequency Calculator:

The period frequency calculator instantly finds the frequency. Get steps involved in the calculation within a couple of seconds by putting data in the fields.


  • Choose the light option (light in vacuum, light in air, light in water)
  • Put the value of the wavelength
  • Select the unit from the filed 
  • Tap “calculate”


Our tool will give you the results as the return is as follows:

  • Frequency value 
  • Step-by-step calculations 


What Is The Relation Of Velocity And The Frequency?

Velocity and frequency are directly related to each other. The velocity of the wave can be measured by multiplying the frequency by the wavelength. 

V = f * λ

  • If the value of λ is the constant then the velocity is doubled 
  • If the frequency is double then the velocity is also doubled 

Does Frequency Depend On The Speed?

The speed of the wave is unaffected by the change in the frequency. If there is an increase in the velocity, then a certain change in the frequency will occur.

Why Is The Frequency Always Constant?

The frequency always remains the same during the propagation of the wave while the velocity and the wavelength change. The frequency is the count of the oscillation and it maintains the frequency of the original source within the given time interval. 

Does Period Equal The Frequency?

Frequency and the period are the same measuring characteristics of the wave and can be related to the equation.

Period = 1 / frequency 

Both are inversely related to each other. It means that the higher frequency means a shorter period.


From the source Wikipedia: Frequency, Definitions, and units, Period versus frequency, Related quantities, In wave propagation, Measurement, Examples, Aperiodic frequency.

From the source Lumen Learning: Frequency, Frequency Tables, and Levels of Measurement, Answers, and Rounding Off. 

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