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Annual Building Energy Intensity Calculator

Compare annual energy use with building floor area.

  • Formula & worked example
  • Private in your browser
  • No signup
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Edit a calculated value to solve backwards, or lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

Divide annual energy consumption by floor area. A building using 12,000 kWh over a year with 100 square meters of floor area has an energy use intensity of 120 kWh per square meter per year.

Annual energy use intensity = annual energy consumption ÷ floor area

Worked example

Enter these known values and leave the other values blank.

Total annual energy consumption
12000 kWh
Total floor area
100 m²
Energy use intensity (EUI)
120 kWh/m² / yrs

Assumptions and limitations

  • Use consistent area definitions, annual periods and energy boundaries. Building use, climate, occupancy and whether energy is measured at the site or source affect meaningful comparisons.
  • Use the units shown beside each field. This model assumes the stated relationship and does not account for quantities left out of the formula.

Common questions

Can I compare any two buildings?

Use consistent area definitions, annual periods and energy boundaries. Building use, climate, occupancy and whether energy is measured at the site or source affect meaningful comparisons.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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