Enter the line voltage (volts) into the calculator to determine the Line to Phase Voltage. 

Line to Phase Voltage Formula

The following formula is used to calculate the Line to Phase Voltage. 

Vphase = VL-L / 1.732


  • Where Vphase is the Line to Phase Voltage (volts)
  • VL-L is the line voltage (volts) 

To calculate the phase voltage from line to line voltage, divide the line-to-line voltage by 1.732.

How to Calculate Line to Phase Voltage?

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

Example Problem #1:

  1. First, determine the line voltage (volts). In this example, the line voltage (volts) is measured to be 47.
  2. Finally, calculate the Line to Phase Voltage using the formula above: 

Vphase = VL-L / 1.732

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

Vphase = 47 / 1.732 = 27.136 (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:

line voltage (volts) = 69

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

Vphase = 69 / 1.732 = 39.83 (volts)