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

Frequently Asked Questions

What is the significance of calculating the Energy Performance Index (EPI)?

The Energy Performance Index (EPI) is a crucial metric that helps in assessing the energy efficiency of a building. By calculating the EPI, property owners and managers can understand how much energy their building consumes relative to its size, which is essential for identifying opportunities to reduce energy consumption and improve efficiency.

How can improving a building’s EPI contribute to environmental sustainability?

Improving a building’s EPI can significantly contribute to environmental sustainability by reducing the building’s energy consumption. Lower energy consumption means fewer greenhouse gas emissions and a smaller carbon footprint, which is vital for combating climate change and promoting a healthier environment.

What are some common strategies to improve a building’s Energy Performance Index?

Common strategies to improve a building’s EPI include enhancing insulation, upgrading to energy-efficient lighting and appliances, implementing smart energy management systems, and utilizing renewable energy sources like solar panels. These measures can significantly reduce energy consumption and improve the building’s overall energy performance.

Can the Energy Performance Index be used for all types of buildings?

Yes, the Energy Performance Index can be used for various types of buildings, including residential, commercial, and industrial properties. However, the benchmark EPI values may differ based on the building’s use, location, and other factors, making it important to consider these aspects when evaluating a building’s energy performance.