EUI Calculator

What is Energy Use Intensity (EUI)?

Energy Use Intensity (EUI) is a metric that measures the energy efficiency of a building. It represents the energy consumption per unit of floor area per year. By calculating EUI, building owners, facility managers, and energy auditors can compare the energy performance of buildings regardless of their size, identify opportunities for energy savings, and prioritize efficiency improvements.

A lower EUI indicates a more energy-efficient building, while a higher EUI suggests that a building consumes more energy relative to its size. EUI is typically expressed in kBtu per square foot per year or kWh per square meter per year.

How to Calculate EUI

To calculate EUI, you need two pieces of data: the total annual energy consumption of the building and its total floor area. The formula is straightforward: EUI = Total Annual Energy Consumption / Total Floor Area.

For example, if a building consumes 200,000 kBtu of energy per year and has a floor area of 10,000 ft\u00B2, its EUI would be 200,000 / 10,000 = 20 kBtu per ft\u00B2 per year. This would be considered very efficient. Our EUI calculator supports multiple energy units (kBtu, kWh, GJ, Therms) and area units (square feet, square meters).

Understanding Your EUI Rating

Typical EUI values vary greatly depending on the building type and location. Generally, office buildings have EUI values between 50 and 100 kBtu/ft\u00B2/year, while warehouses may have values as low as 10-30. Our calculator provides a rating system: Very Efficient (under 20), Efficient (20-40), Average (40-70), Inefficient (70-100), and Very Inefficient (over 100 kBtu/ft\u00B2/year). These benchmarks help you quickly assess your building's performance.

For other energy-related calculations, check our Electricity Calculator and Energy Cost Calculator. If you are working with building measurements, try our Area Converter.