Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- All fuels must first be converted to kWh and summed. Site energy, not source energy; no weather or occupancy normalization.
Example Calculation
- Annual delivered energy: 120000 kWh
- Gross floor area: 1000 m²
120,000 kWh across 1000 m² equals 120 kWh/m² per year.
Frequently asked questions
How do I use this calculator?
Enter annual delivered energy, gross floor area. The result updates automatically. Use Reset to restore the example values.
What method does it use?
site EUI=annual delivered kWh/gross floor area.. All fuels must first be converted to kWh and summed. Site energy, not source energy; no weather or occupancy normalization.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.