ClueLuma

Floor-area energy cost index calculator

Annual energy cost intensity divides the specified annual cost by floor area; the area unit must be the same across comparisons.

Units
ECIIP=CannualAft2\mathrm{ECI}_{\text{IP}} = \frac{C_{\text{annual}}}{A_{\text{ft2}}}

Calculator

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

$/year
ft²
$/ft²/year

Worked example

Given

  • CannualC_{\text{annual}} = 93,600 $/year
  • Aft2A_{\text{ft2}} = 48,000 ft²
ECIIP=93,60048,000=1.95\mathrm{ECI}_{\text{IP}} = \frac{93{,}600}{48{,}000} = 1.95

Symbols and units

SymbolMeaningUnit
ECIIP\mathrm{ECI}_{\text{IP}}energy cost per floor area$/ft²/year
CannualC_{\text{annual}}annual energy cost$/year
Aft2A_{\text{ft2}}floor areaft²

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