Peak Voltage Calculator
Calculate the peak voltage using either the peak-to-peak or the RMS voltage and the calculator below.
Convert Peak-to-Peak Voltage to Peak Voltage
Convert RMS Voltage to Peak Voltage
Peak Voltage Results:
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How to Calculate Peak Voltage
The peak voltage is the distance from 0 volts to the peak of the AC sine waveform, or the highest point of the waveform. Peak voltage can be found if you know the peak-to-peak voltage or the RMS voltage.
Peak-to-Peak Voltage to Peak Voltage Formula
If you know the peak-to-peak voltage then you can find the peak voltage using this formula where VP-P is the peak-to-peak voltage.
VP = VP-P / 2
Thus, peak voltage is equal to peak-to-peak voltage divided by two.
For example, find the peak voltage given a peak-to-peak voltage of 240 V.
VP = 240 V / 2
VP = 120 V
RMS Voltage to Peak Voltage Formula
If the RMS voltage is known then the peak voltage can be found using this formula where VRMS is the RMS voltage.
VP = √2 × VRMS
Thus, peak voltage is equal to the square root of two times the RMS voltage.
For example, find the peak voltage if the RMS voltage is 85 V.
VP = √2 × 85 V
VP = 120.208 V