Energy utilization index (EUI) calculator

Annual site energy divided by conditioned area; compare facilities with similar use and operating conditions.

Units

\mathrm{EUI} = \frac{\text{Annual energy}}{\text{Conditioned floor area}}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

\mathrm{EUI} = \frac{720{,}000{,}000}{24{,}000} = 30{,}000

Symbol	Meaning	Unit
$\mathrm{EUI}$	energy utilization index	Btu/(ft²·yr)
$\text{Annual energy}$	combined annual end-use energy	Btu/yr
$\text{Conditioned floor area}$	conditioned area	ft²

Symbol	Meaning	Unit
$\mathrm{EUI}$	energy utilization index	MJ/(m²·yr)
$\text{Annual energy}$	combined annual end-use energy	MJ/yr
$\text{Conditioned floor area}$	conditioned area	m²

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.