EUI Calculator - Energy Use Intensity
Calculate a building's energy use intensity from annual energy consumption and floor area.
EUI is a quick way to compare efficiency between buildings, spaces, or annual operating periods.
Result
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Run the calculation to see the intensity.
| Metric | Value |
|---|---|
| Energy in kWh | -- |
| Area in m2 | -- |
| Area in ft2 | -- |
| kWh/m2/year | -- |
| kBtu/ft2/year | -- |
Quick Answer
EUI equals annual energy divided by floor area. Lower numbers generally mean the building uses less energy per unit of area.
How to Calculate
- Enter annual energy use.
- Choose the energy unit.
- Enter the floor area and area unit.
- Click Calculate to see both metric and imperial EUI values.
Formula
EUI = annual energy / floor area
Metric output = kWh / m2 / year
Imperial output = kBtu / ft2 / year
Worked Examples
Example 1: 50,000 kWh used in a 2,500 m2 building gives 20 kWh/m2/year.
Example 2: 170,607 kBtu over 10,000 ft2 gives about 17.1 kBtu/ft2/year.
Example 3: The same energy spread over more floor area produces a lower EUI.
How to Interpret Your Results
| Output | Meaning | Action |
|---|---|---|
| kWh/m2/year | Metric intensity for building energy performance. | Use it for benchmarking and trend tracking. |
| kBtu/ft2/year | Imperial intensity used in many US building reports. | Use it to compare with published benchmarks. |
| Energy conversions | Converted values before the ratio is calculated. | Check these if the result looks unexpected. |
Frequently Asked Questions
Use whichever unit you have. The calculator converts common annual energy units first.
Different reports and regions use different standards, so both are helpful.
No. EUI is a simple energy-per-area ratio, so outside factors are not built into the formula.
Related Calculators
References
- OmniCalculator reference page
- EUI is the ratio of annual energy consumption to building area.
- Last reviewed: March 2026.