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 (%) 

To calculate the brushless motor input power, divide the output power by the efficiency of the motor.

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)