Building Energy Benchmark Calculator
Energy Use Intensity (EUI) is the single most useful first-pass metric for benchmarking a commercial building's energy performance — annual energy consumption divided by floor area, expressed in kBtu per square foot per year. This calculator takes your building's square footage, total annual site energy across all fuel types, and building type, then reports your building's EUI and how it compares to the national median EUI for that building type, with a clear better-than/worse-than flag. For two efficiency measures that pair naturally with a benchmarking program, see our Commercial HVAC Load Calculator and Lighting Retrofit ROI Calculator.
Total conditioned floor area of the building, in square feet.
Enter total annual site energy use across all fuel types (electricity, natural gas, etc.), converted to kBtu. 1 kWh = 3.412 kBtu; 1 therm = 100 kBtu.
Selecting a type auto-fills the reference median EUI below (still editable). Medians are ENERGY STAR Portfolio Manager U.S. National Median Reference values.
Based on ENERGY STAR Portfolio Manager U.S. National Median Reference values. Medians shift over time as building stock and methodology evolve — use ENERGY STAR Portfolio Manager directly for the most current, climate-adjusted comparison.
annual energy consumption (kBtu) ÷ building square footage
Worse than national median for this building type
Results update live as you type. For planning and field-check estimates — always verify against applicable standards and equipment ratings.
How we calculate this →EUI benchmarks vary meaningfully by source and year, since national median energy use intensity is recalculated as building stock and reporting methodology evolve — ENERGY STAR's own reference data has shown office medians ranging from the high-60s to over 80 kBtu/sqft/yr across different reporting periods. Rather than treating any single median as gospel, use this calculator to establish your building's baseline EUI, then track it over time and against ENERGY STAR Portfolio Manager's live benchmarking tool for the most current, climate-adjusted comparison.
How building energy benchmarking is calculated
This calculator ties a building's energy performance to three inputs: its floor area, its total annual site energy consumption, and a reference median EUI for its building type. Two quantities tie the calculation together.
Building EUI (kBtu/sqft/yr) = Annual Energy Consumption (kBtu) ÷ Building Square Footage (sq ft). Energy Use Intensity normalizes a building's total annual energy use by its floor area so buildings of different sizes can be compared on a common basis — similar to a miles-per-gallon rating for vehicles. At 4,000,000 kBtu and 50,000 sq ft, that is 4,000,000 ÷ 50,000 = 80 kBtu/sqft/yr. Annual energy consumption should be total site energy across all fuel types, converted to a common unit (kBtu): 1 kWh = 3.412 kBtu and 1 therm of natural gas = 100 kBtu, so a building using 500,000 kWh of electricity and 20,000 therms of gas consumes (500,000 × 3.412) + (20,000 × 100) = 1,706,000 + 2,000,000 = 3,706,000 kBtu.
Performance vs. Median (%) = ((Reference Median EUI (kBtu/sqft/yr) − Building EUI (kBtu/sqft/yr)) ÷ Reference Median EUI (kBtu/sqft/yr)) × 100. A positive result means the building uses less energy per square foot than the national median for its type (better than median); a negative result means it uses more (worse than median). At a building EUI of 80 and an office median of 67, that is ((67 − 80) ÷ 67) × 100 = −19.4% — worse than the national median for an office. The reference medians are ENERGY STAR Portfolio Manager U.S. National Median Reference values by building type (Office 67, Retail 52, K-12 School 48, Warehouse 40, Hospital 230 kBtu/sqft/yr).
Two notes on the model. First, this is a site EUI comparison — it measures energy consumed at the building itself, not source energy (which additionally accounts for power plant and transmission losses); ENERGY STAR's 1-100 score is based on source EUI and is climate-adjusted, so the two metrics can rank buildings differently. Second, a single median is a rough first-pass benchmark, not a precise performance rating: medians shift over time as building stock and reporting methodology evolve, and a building's true peer group depends on climate, operating hours, occupancy, and specific use. For compliance with building performance ordinances and benchmarking laws, use ENERGY STAR Portfolio Manager directly. Data sources: ENERGY STAR Portfolio Manager U.S. National Median Reference values by building type; CBECS (Commercial Buildings Energy Consumption Survey) data from EIA; site vs. source energy methodology from EPA and ASHRAE standards; building energy benchmarking standards from ASHRAE 90.1 and IECC.