What is EUI?

EUI, or energy use intensity, is a unit of measurement that describes a building’s energy use. EUI represents the energy consumed by a building relative to its size.*

How is EUI Calculated?


A building’s EUI is calculated by taking the total energy consumed in one year (measured in kBtu) and dividing it by the total floorspace of the building. For example, if a 10,000-square-foot school consumed 1,000,000 kBtu of energy last year, its EUI would be 100. A similarly sized school that consumed 1,500,000 kBtu of energy last year would have a higher EUI (150) to reflect its higher energy use. The lower the EUI the better the energy performance.

Why do Some Buildings Have Much Higher EUIs than Others?

Certain building types will always use more energy than others. For example, a classroom building typically uses less energy than a hospital or lab building. Similarly, a home or brownstone row house typically uses less energy than an administrative office building.

eui CBECS table 13-06-21 copy

Why should I care?

Energy use is the most important issue within the University’s sustainability efforts because it is directly linked to operating costs and CO2 emissions, which contribute to climate change. In order to most effectively address cost and emissions, we must first reduce energy consumption.


*Source: Energy Star