Building Energy Performance Calculator
Estimate energy performance from area and annual consumption to benchmark building efficiency.
Energy Performance Calculator
Results
Data Source and Methodology
All calculations are strictly based on the data and formulas provided by the International Energy Agency. Learn more.
The Formula Explained
The Energy Performance Index (EPI) is calculated using the formula:
EPI = \(\frac{Annual Energy Consumption}{Building Area}\)
Glossary of Terms
- Building Area: The total floor area of the building.
- Annual Energy Consumption: The total energy consumed by the building annually in kilowatt-hours (kWh).
- Energy Performance Index: A measure of energy efficiency calculated as annual energy consumption per square meter.
How It Works: A Step-by-Step Example
For a building with an area of 1000 sq meters and an annual energy consumption of 500,000 kWh, the EPI is calculated as follows:
EPI = 500,000 / 1000 = 500 kWh/sq meter
Frequently Asked Questions (FAQ)
What is the Energy Performance Index?
The EPI is a measure of how efficiently a building uses energy, calculated by dividing the annual energy consumption by the building area.
Why is EPI important?
EPI helps identify energy-saving opportunities and improve building sustainability.
How can I improve my building's EPI?
Consider implementing energy-efficient systems, improving insulation, and using renewable energy sources.
Formula (LaTeX) + variables + units
','
EPI = \(\frac{Annual Energy Consumption}{Building Area}\)
- No variables provided in audit spec.
- Learn more — iea.org · Accessed 2026-01-19
https://www.iea.org/
Last code update: 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.