Enter the full load current (amps) and the percentage of full load current (%) into the calculator to determine the No Load Current. 

No Load Current Formula

The following formula is used to calculate the No Load Current. 

In-L = FLC * R/100
  • Where In-L is the No Load Current (amps)
  • FLC is the full load current (amps) 
  • R is the percentage of full load current (%) 
    • star motor = 10%
    • delta motor = 30%
    • dc motor = 25%

To calculate the no-load current, multiply the full load current by the percentage load factor over 100.

How to Calculate No Load Current?

The following two example problems outline how to calculate the No Load Current.

Example Problem #1:

  1. First, determine the full load current (amps). In this example, the full load current (amps) is measured to be 450.
  2. Next, determine the percentage of full load current (%). For this problem, the percentage of full load current (%) is calculated to be 52.
  3. Finally, calculate the No Load Current using the formula above: 

In-L = FLC * R/100

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

In-L =450* 52/100 = 234 (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:

full load current (amps) = 120

percentage of full load current (%) = 42

Entering these values into the formula above gives : 

In-L = 120* 42/100 = 50.4 (amps)