RMS Voltage Calculator

This RMS Voltage calculator helps to find the RMS voltage value from the known values of either peak voltage, peak-to-peak voltage or average voltage. It calculates the RMS voltage based on the given equations.


rms voltage calculation and formulas







How to Calculate RMS Voltage?


RMS (Root Mean Square) Voltage (Vrms)

Every waveform’s RMS value is the DC-equivalent voltage. Let’s take an example, if the RMS value of a sine wave is 10 volts then it means you can deliver the same amount of power via DC source of 10 volts. Do not confuse in between Average voltage and RMS voltage, as they not equal.


Peak Voltage (Vp)

A Peak voltage of a sine wave is measured from the horizontal axis (which is taken from the reference point 0) to the crest (which is the top or maximum voltage level) of the waveform. Peak voltage shows the amplitude of the waveform.


Vp = √2 * Vrms


By, this formula we can get the value Vrms of  with respect to peak voltage.


Vrms = 0.7071 * Vp


Peak-to-Peak voltage (Vpp)

The difference between maximum peak voltage and minimum peak voltage, or the sum of the positive and negative magnitude of peaks is known as the Peak-to-Peak voltage.


Vpp = 2√2 * Vrms


By, this formula we can get the value of Vrms with respect to peak-to-peak voltage.


Vrms = 0.35355 * Vpp


Average voltage (Vavg)

The average value of a sine wave is zero because the area covered by the positive half cycle is similar to the area of the negative half cycle, so these value cancel each other when the mean is taken. Then the average value is measured by the half cycle only, generally we take the positive half cycle part for measuring.

The average voltage defined as “the quotient of the area under the waveform with respect to time”.


Vavg = 2√2/π * Vrms


By, this formula we can get the value of  Vrms with respect to peak-to-peak voltage.


Vrms = 1.1107 * Vavg