// multi-utility computation suite · offline · instant · precise
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│ [c] calcalyst_ │
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env.building-energy-use Calculator
Calculates a building's Energy Use Intensity (EUI) in kBtu/ft² per year and compares it to ASHRAE 90.1 benchmarks for the building type. EUI is the primary metric for energy benchmarking programs like ENERGY STAR and LEED.
Inputs
Floor Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Heating Kwh
Reference formula or conversion factor shown for context.
Cooling Kwh
Reference formula or conversion factor shown for context.
Lighting Kwh
Reference formula or conversion factor shown for context.
Results
EUI (kWh/m²/yr)
Reference formula or conversion factor shown for context.
total energy (kWh/yr)
The combined total across all inputs and components.
carbon emissions (tonnes CO2)
Sample size or count used in the calculation.
heating fraction
The value at the specified point or condition.
PassivHaus standard
Sample size or count used in the calculation.
typical office EUI
Reference formula or conversion factor shown for context.