Energy Use Intensity Calculator

Work out energy use intensity instantly with clear inputs, formula shown and shareable results.

About Energy Use Intensity Calculator

Energy use intensity normalises consumption by floor area so buildings of different size can be compared. Reporting conventions differ: Europe and Asia use kilowatt hours per square metre a year, North America uses thousand Btu per square foot. A well managed office sits around 100-150 kWh/m², a poor one above 250.

Formula

Energy use intensity

kWh/m²/year = annual kWh / area in m²; kBtu/ft² = kWh/ft² x 3.412

Worked example

With the default values below, Energy Use Intensity Calculator returns Energy use intensity of 161.46. Change any input above and every figure here is recalculated in your browser.

Inputs used

Annual electricity consumptionminimum 0 kWh: 900,000 kWh
Gross floor areaminimum 0.1 ft²: 60,000 ft²

Results

Energy use intensity: 161.46 kWh/m²/year
Intensity per square foot: 15.000 kWh/ft²/year
Intensity in kBtu: 51.18 kBtu/ft²/year
Average daily consumption: 2,465.8 kWh

Step by step

1Values used
2Energy use intensity
3Energy use intensity= 161.46 kWh/m²/year
4Intensity per square foot= 15.000 kWh/ft²/year
5Intensity in kBtu= 51.18 kBtu/ft²/year
6Average daily consumption= 2,465.8 kWh

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or fees or charges into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Energy Use Intensity figure worked out?

kWh/m²/year = annual kWh / area in m²; kBtu/ft² = kWh/ft² x 3.412. Energy use intensity normalises consumption by floor area so buildings of different size can be compared.

Should fuel be included?

Yes for a complete picture. Site EUI adds all delivered energy in common units, and source EUI further accounts for generation and transmission losses, which roughly triples the electricity component.

What values do I need to enter?

This calculator takes 2 inputs: Annual electricity consumption, Gross floor area. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.