Enter the energy output and the energy input into the Calculator. The calculator will evaluate the Energy Efficiency Factor. 

Energy Efficiency Factor Formula

EEF = EO / EI 


  • EEF is the Energy Efficiency Factor
  • EO is the energy output
  • EI is the energy input

To calculate Energy Efficiency Factor, divide the energy output by the energy input.

How to Calculate Energy Efficiency Factor?

The following steps outline how to calculate the Energy Efficiency Factor.

  1. First, determine the energy output. 
  2. Next, determine the energy input. 
  3. Next, gather the formula from above = EEF = EO / EI .
  4. Finally, calculate the Energy Efficiency Factor.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

energy output = 300

energy input = 400