Enter the generator output (power) and the generator losses (power) into the calculator to determine the Generator Efficiency. 

Generator Efficiency Formula

The following formula is used to calculate the Generator Efficiency. 

Egen = O / (O+L) * 100

  • Where Egen is the Generator Efficiency (%)
  • O is the generator output (power) 
  • L is the generator losses (power) 

How to Calculate Generator Efficiency?

The following two example problems outline how to calculate the Generator Efficiency.

Example Problem #1:

  1. First, determine the generator output (power). In this example, the generator output (power) is given as 5.
  2. Next, determine the generator losses (power). For this problem, the generator losses (power) is given as 2.
  3. Finally, calculate the Generator Efficiency using the equation above: 

Egen = O / (O+L) * 100

Inserting the values from above and solving the equation: 

Egen = 5 / (5+2) * 100 = 71.4 (%)


Example Problem #2: 

Using the same process as above, first define the variables required by the formula. In this case, these values are:

generator output (power) = 100

generator losses (power) = 30

Entering these values yields:

Egen = 30 / (130) * 100 = 23.07 (%)