Enter the output power (watts) and the efficiency (%) into the calculator to determine the Brushless Motor Input Power. 

Brushless Motor Input Power Formula

The following formula is used to calculate the Brushless Motor Input Power. 

Pi = Po/(E/100)

  • Where Pi is the Brushless Motor Input Power (watts)
  • Po is the output power (watts) 
  • E is the efficiency (%) 

How to Calculate Brushless Motor Input Power?

The following two example problems outline how to calculate the Brushless Motor Input Power.

Example Problem #1:

  1. First, determine the output power (watts). In this example, the output power (watts) is measured to be 50.
  2. Next, determine the efficiency (%). For this problem, the efficiency (%) is calculated to be 50.
  3. Finally, calculate the Brushless Motor Input Power using the formula above: 

Pi = Po/(E/100)

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

Pi = 50/(50/100) = 100 (watts)


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:

output power (watts) = 40

efficiency (%) = 30

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

Pi = 40/(30/100) = 133.33(watts)