Enter the peak voltage (volts) into the calculator to determine the Effective Voltage. 

Effective Voltage Formula

The following formula is used to calculate the Effective Voltage. 

Veff = Vp / SQRT(2)


  • Where Veff is the Effective Voltage (volts)
  • Vp is the peak voltage (volts) 

To calculate the effective voltage, divide the peak voltage by the square root of 2.

How to Calculate Effective Voltage?

The following two example problems outline how to calculate the Effective Voltage.

Example Problem #1:

  1. First, determine the peak voltage (volts). In this example, the peak voltage (volts) is measured to be 37.
  2. Finally, calculate the Effective Voltage using the formula above: 

Veff = Vp / SQRT(2)

Inserting the values from above and solving the equation with the imputed values gives: 

Veff = 37 / SQRT(2) = 26.162 (volts)

Example Problem #2: 

Using the same process as example problem 1, we first define the variables outlined by the formula. In this case, the values are:

peak voltage (volts) = 1000

Entering these values into the formula or calculator above gives us:: 

Veff = 1000 / SQRT(2) = 707.106 (volts)