# 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:

## On this page:

Do you want to calculate peak-to-peak voltage or RMS voltage?

## 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 V_{P-P} is the peak-to-peak voltage.

V_{P} = V_{P-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.

V_{P} = 240 V / 2

V_{P} = 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 V_{RMS} is the RMS voltage.

V_{P} = √2 × V_{RMS}

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.

V_{P} = √2 × 85 V

V_{P} = 120.208 V