Measure energy intensity, emissions, and benchmark alignment. Turn building data into practical performance decisions today.
| Building Type | Floor Area (m²) | Electricity (kWh) | Fuel (kWh) | Renewables (kWh) | Net EUI (kWh/m²·yr) |
|---|---|---|---|---|---|
| Office Block | 1200 | 185000 | 95000 | 22000 | 215.00 |
| School Wing | 2400 | 248000 | 118000 | 45000 | 133.75 |
| Retail Unit | 800 | 99000 | 21000 | 7000 | 141.25 |
Gross Annual Energy = Annual Electricity + Annual Fuel Energy
Net Annual Energy = Gross Annual Energy − Onsite Renewable Generation
Energy Use Intensity = Net Annual Energy ÷ Floor Area
Conditioned EUI = Net Annual Energy ÷ Conditioned Area
Conditioned Area = Floor Area × Conditioned Area Ratio
Energy per Occupant = Net Annual Energy ÷ Occupants
Annual Operating Hours = Weekly Operating Hours × 52
Base Load Energy = Net Annual Energy × Base Load Ratio
Variable Load Energy = Net Annual Energy − Base Load Energy
Renewable Share (%) = Onsite Renewable Generation ÷ Gross Annual Energy × 100
Electricity CO₂ = Electricity Use × Electricity Emission Factor
Fuel CO₂ = Fuel Use × Fuel Emission Factor
Total CO₂ = Electricity CO₂ + Fuel CO₂
Carbon Intensity = Total CO₂ ÷ Floor Area
Performance Score (%) = Benchmark EUI ÷ Net EUI × 100
Benchmark Gap = Benchmark EUI − Net EUI
Climate Normalized EUI Index = (Net EUI × 1000 ÷ Climate Index) × 100
Climate Index = (Heating Degree Days × 0.55) + (Cooling Degree Days × 0.45)
Enter the building floor area and annual delivered energy values first. Add electricity, fuel, and onsite renewable generation in consistent yearly units.
Supply occupancy, operating hours, climate degree days, and benchmark EUI to expand the analysis. These fields help compare buildings more meaningfully.
Use emission factors that reflect your local grid and fuel conditions. This improves the carbon estimates and intensity indicators.
Click Calculate Performance to display the result summary above the form. Review the EUI, score, carbon intensity, and performance class.
Use the CSV button for spreadsheet analysis and the PDF button for reporting, meetings, or record keeping.
EUI means energy use intensity. It shows annual net energy consumed per square meter of floor area, making building performance easier to compare.
Onsite renewable output offsets delivered energy demand. Subtracting it helps estimate net building energy performance after local generation contributes to operations.
Yes. The calculator suits many building types, including offices, schools, retail spaces, and mixed-use facilities, as long as yearly inputs are consistent.
Benchmark EUI acts as a target or reference. The calculator compares your building against it and estimates a performance score and gap.
No. Emission factors vary by region, utility mix, and fuel source. Use local or project-specific values whenever available for better carbon estimates.
It estimates the portion of total floor area that is actively heated or cooled. This helps derive a conditioned EUI for focused analysis.
Degree days give climate context. They help create a normalization index so buildings in different weather conditions can be interpreted more fairly.
No. It supports screening and benchmarking. Detailed audits still require end-use breakdowns, schedules, equipment data, and site-specific engineering review.
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.