1. What is Energy Use Index?

The Energy Use Index (EUI) is a measure of a building's energy consumption relative to its size. It's calculated by dividing total energy consumed by the total floor area of the building, providing a standardized metric for comparing energy performance across different buildings.

2. How Does the Calculator Work?

The calculator uses the Energy Use Index formula:

Where:

• Energy Consumption — Total energy used in kilowatt-hours (kWh)
• Area — Total floor area in square feet (ft²)

Explanation: The equation provides a simple way to normalize energy consumption data for buildings of different sizes.

3. Importance of Energy Use Index

Details: EUI is crucial for energy benchmarking, identifying energy efficiency opportunities, and tracking performance improvements over time. It's widely used in energy audits and sustainability reporting.

4. Using the Calculator

Tips: Enter total energy consumption in kWh and total area in square feet. Both values must be positive numbers. The calculator will output the EUI in kWh/ft².

5. Frequently Asked Questions (FAQ)

Q1: What is a good Energy Use Index value?
A: Typical EUI values vary by building type. Office buildings might range 20-50 kWh/ft²/year, while data centers could be 100+ kWh/ft²/year.

Q2: Can I use different units?
A: Yes, but ensure both numerator and denominator use consistent units (e.g., MJ and m²) for meaningful comparisons.

Q3: What time period should be used?
A: Typically annual data is used, but monthly or quarterly calculations can help track seasonal variations.

Q4: How does EUI differ from Energy Intensity?
A: They're similar terms, but EUI specifically refers to site energy use (energy consumed at the building), while Energy Intensity might include source energy.

Q5: What factors affect EUI?
A: Building type, climate, operating hours, equipment efficiency, and occupant behavior all influence EUI.