Enter the total line current (amps) into the calculator to determine the Phase Current. 

Phase Current From Line Current Formula

The following formula is used to calculate the Phase Current. 

Ip = IL / SQRT(3)
  • Where Ip is the Phase Current (amps)
  • IL is the total line current (amps) 

To calculate the phase current, divide the line current by the square root of 3.

How to Calculate Phase Current From Line Current?

The following two example problems outline how to calculate the Phase Current from line current.

Example Problem #1:

  1. First, determine the total line current (amps). In this example, the total line current (amps) is measured to be 61.
  2. Finally, calculate the Phase Current using the formula above: 

Ip = IL / SQRT(3)

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

Ip = 61 / SQRT(3) = 35.21 (amps)

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:

total line current (amps) = 18

Entering these values into the formula above gives us:: 

Ip = IL / SQRT(3) = 10.39 (amps)