Enter the annual energy consumption (kWh) and the building area (m^2) into the Calculator. The calculator will evaluate the Energy Performance Index. 

Energy Performance Index Formula

EPI = EC / A


  • EPI is the Energy Performance Index (kWh/m^2)
  • EC is the annual energy consumption (kWh)
  • A is the building area (m^2)

To calculate Energy Performance Index, divide the annual energy consumption by the total building area.

How to Calculate Energy Performance Index?

The following steps outline how to calculate the Energy Performance Index.

  1. First, determine the annual energy consumption (kWh). 
  2. Next, determine the building area (m^2). 
  3. Next, gather the formula from above = EPI = EC / A.
  4. Finally, calculate the Energy Performance Index.
  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.

annual energy consumption (kWh) = 675

building area (m^2) = 800