Evaluate total building energy against floor area with confidence. Review source loads, net demand, and yearly efficiency results for smarter decisions.
| Building | Area | Electricity kWh | Gas Therms | Renewable kWh | Net EUI kWh/m²/year |
|---|---|---|---|---|---|
| Office Block A | 4200 m² | 310000 | 4200 | 28000 | 95.60 |
| Retail Plaza B | 3500 m² | 280000 | 2500 | 15000 | 96.65 |
| School Wing C | 5100 m² | 360000 | 3100 | 40000 | 80.56 |
Energy Use Intensity shows annual energy use per unit area. It compares buildings of different sizes with one normalized performance indicator.
Gross EUI = Total Annual Energy Use ÷ Gross Floor Area
Net EUI = (Total Annual Energy Use − Onsite Renewable Offset) ÷ Gross Floor Area
The calculator converts all entered fuels into a common unit first. It then reports results as kWh/m²/year and kBtu/ft²/year.
Common conversions used here:
Energy Use Intensity is a practical construction and facility metric. It links building energy demand with gross floor area. This makes performance tracking easier across offices, schools, warehouses, and mixed-use projects.
A low EUI often suggests efficient systems, better controls, and reduced waste. A high EUI can point to poor envelopes, long schedules, aging plant equipment, or heavy internal loads. Context still matters because climate, building type, and occupancy patterns strongly affect results.
Design teams use EUI in early planning and post-occupancy reviews. Owners use it to compare sites, set targets, and justify upgrades. Contractors and consultants also use it when discussing envelope changes, mechanical replacement, lighting retrofits, or renewable integration.
This calculator supports multiple energy streams in one place. That helps when a project combines electricity with gas, chilled water, district steam, or delivered fuels. The renewable offset input also helps estimate net operational intensity.
For best results, use full-year utility data and one consistent floor area method. Keep units clean and avoid mixing partial-year values. When benchmarking, compare similar buildings with similar operating profiles. This produces more meaningful conclusions and more reliable efficiency planning.
EUI measures annual energy use divided by gross floor area. It helps compare energy performance across buildings with different sizes.
Gross EUI uses all consumed energy. Net EUI subtracts onsite renewable production first. This helps show how much purchased energy remains after local generation.
Enter gross floor area used for your reporting method. Stay consistent across periods so comparisons remain accurate and useful.
Yes, but annualized full-year data gives better results. Partial-year values can distort EUI when seasons or occupancy vary strongly.
Different fuels come in different units. Converting them first allows one combined annual energy total for fair EUI calculation.
In this calculator, onsite renewable offset reduces net energy use. Gross EUI stays unchanged because it reflects total delivered and used energy.
A good target depends on climate, building type, schedule, and systems. Compare similar properties or local benchmarks for realistic goals.
Yes. EUI is useful before and after upgrades. It helps measure the effect of controls, envelope improvements, equipment changes, and renewables.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.