Building Energy Use Intensity (EUI
Energy Use Intensity (EUI) is the key metric used by ENERGY STAR and building regulators to measure a property's annual energy consumption per square foot.
⚙ Input Values
📊 Results
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📐 Formula
💡 Practical Example
50,000 sq ft office building consuming 600,000 kWh electricity and 15,000 therms natural gas per year: Electricity kBTU = 600,000 × 3.41214 = 2,047,284 kBTU. Natural Gas kBTU = 15,000 × 100 = 1,500,000 kBTU. Site EUI = 3,547,284 / 50,000 = 70.9 kBTU/sq ft/yr (AVERAGE COMMERCIAL BUILDING).
📖 About Building Energy Use Intensity (EUI
Energy Use Intensity (EUI) is the key metric used by ENERGY STAR and building regulators to measure a property's annual energy consumption per square foot.
To use the Building Energy Use Intensity (EUI) Calculator, enter your Gross Building Floor Area, Annual Electricity Consumption, Annual Natural Gas Consumption. The calculator instantly computes Site Energy Use Intensity (EUI), Total Annual Site Energy and more. Results update in real time as you change any input — no submit button needed.
How to Use This Calculator
Enter your Gross Building Floor Area (e.g. 50000 in sq ft), Annual Electricity Consumption (e.g. 600000 in kWh/yr), and Annual Natural Gas Consumption (e.g. 15000 in therms/yr). Verify your units match the formula standard (SI vs imperial) before entering values.
The Formula
Electricity kBTU = kWh × 3.41214
Natural Gas kBTU = Therms × 100
Site EUI (kBTU/sq ft/yr) = Total Site Energy (kBTU) ÷ Gross Building Area (sq ft)
Worked Example
50,000 sq ft office building consuming 600,000 kWh electricity and 15,000 therms natural gas per year:
Electricity kBTU = 600,000 × 3.41214 = 2,047,284 kBTU.
Natural Gas kBTU = 15,000 × 100 = 1,500,000 kBTU.
Site EUI = 3,547,284 / 50,000 = 70.9 kBTU/sq ft/yr (AVERAGE COMMERCIAL BUILDING).
Understanding Your Result
Energy unit conversions: 1 kWh = 3,600,000 J (3.6 MJ), 1 kcal (food calorie) = 4,184 J, 1 BTU = 1,055 J. Power benchmarks: LED bulb 8–10 W, laptop 15–60 W, desktop PC 200–500 W, hair dryer 1,000–1,800 W, electric vehicle charger (Level 2) 7,200 W. A 100W device running 10 hours uses 1 kWh. At 15 cents/kWh (US average), that's 0.
- Energy efficiency is typically more cost-effective than energy generation — 1 unit of energy saved often costs 3–5× less than 1 unit generated.
💡 Methodological Standards & Calculation Accuracy
- All calculations are performed client-side in your browser using verified, standards-compliant mathematical algorithms.
- Results are provided for educational and informational analysis; verify critical applications with certified domain specialists.
- Ensure input values are entered in consistent units matching the selector options to guarantee accurate outputs.
- Periodic recalibration is recommended whenever baseline assumptions, operating parameters, or external conditions change.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.