Enter the line frequency and the number of phases into the calculator to determine the ripple frequency.

Ripple Frequency Formula

The following equation is used to calculate the Ripple Frequency.

RF = 2*LF*#P

  • Where RF is the ripple frequency (hz)
  • LF is the line frequency (hz)
  • #P is the number of phases

To calculate the ripple frequency, multiply the line frequency by 2, then multiply that result by the number of phases.

What is a Ripple Frequency?


A ripple frequency is a frequency at which a composite waveform, consisting of harmonics of some fundamental frequency, is oscillating.

How to Calculate Ripple Frequency?

Example Problem:

The following example outlines the steps and information needed to calculate Ripple Frequency.

First, determine the line frequency. In this example, the line frequency is measured to be 500 hz.

Next, determine the number of phases of the power supply. For this problem, the number of phases is 3.

Finally, calculate the ripple frequency using the formula above:

RF = 2*LF*#P

RF = 2*500*3

RF = 3,000 hz