VRMS stands for “root-mean-square”, which is a measurement of the voltage on an alternating current power line.

The voltage varies cyclically, and has a maximum value where it crosses zero volts, and this value is associated with the peak or pk volts (V P ). The root mean square voltage (V rms ) is typically 3.16 times greater than V P . Note that these are different because they use different dimensions of measurement, since rms amps require time while P amps do not require any time measurements at all. Therefore V rms -V P =constant*time*3.16

In simple words: If you have two voltages mentioned in RMS and non-RMS, you can convert the RMS voltage into non-RMS by multiplying it with 3.16. However, in most cases they are mentioned in the same number and it is the amps which need to be converted.