EUI calculator

Calculate Energy Use Intensity and compare to industry benchmarks

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The EUI Calculator helps architects and engineers evaluate building energy performance by calculating Energy Use Intensity and comparing against benchmark values for similar building types.

EUI (Energy Use Intensity) measures annual energy consumption per square foot, providing a normalized metric to compare buildings of different sizes. Lower EUI values indicate better energy efficiency.

Enter your building's total energy consumption and floor area to calculate EUI. Compare against benchmarks for your building type to understand performance relative to typical buildings and high-performance targets.

Features

Everything you need

EUI calculation from consumption data
Building type benchmark comparison
ENERGY STAR score correlation
Site vs. source energy options
Multiple fuel type support
kBtu conversion helpers
Performance target tracking

How it works

Simple workflow

1
Enter annual energy consumption by fuel type
2
Input the building's gross floor area
3
Select your building type for benchmarking
4
View calculated EUI and percentile ranking
5
Compare to code baselines and high-performance targets

Use cases

Built for real-world scenarios

Design targets

Set aggressive EUI targets during early design to drive sustainable strategies.

Portfolio benchmarking

Compare energy performance across multiple buildings to prioritize improvements.

Code compliance

Verify designs meet energy code EUI caps and stretch code requirements.

LEED documentation

Calculate baseline and proposed EUI for energy performance credits.

FAQ

Frequently asked questions

Average US office EUI is about 90 kBtu/sf/year. ENERGY STAR certified offices are typically below 75 kBtu/sf/year. High-performance buildings achieve 50-60 kBtu/sf/year, while net-zero buildings target under 30.

EUI = Total Annual Energy (kBtu) ÷ Gross Floor Area (sf). Convert all fuels to kBtu first: electricity kWh × 3.412 = kBtu; natural gas therms × 100 = kBtu.

Site EUI measures energy consumed at the building. Source EUI accounts for generation and transmission losses—electricity is multiplied by ~3 to reflect power plant inefficiency. Source EUI enables fair comparison between all-electric and gas buildings.

Code EUI requirements vary by jurisdiction and building type. ASHRAE 90.1-2019 typically results in EUIs of 35-85 kBtu/sf depending on building type. Some jurisdictions require annual reporting above certain EUI thresholds.

Have a suggestion?

We're always looking to improve our calculators. If you have ideas for new features, improvements, or found something that could work better, we'd love to hear from you.

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