EUI Calculator — Energy Use Intensity
Energy Use Intensity (EUI) normalises a building's total annual energy consumption by its floor area, making it possible to compare buildings of different sizes and benchmark against ENERGY STAR standards. Enter annual electricity (kWh) and natural gas (therms or kWh) alongside floor area to calculate EUI in both imperial and metric units.
Unit system
kWh
therms
sq ft
Energy Use Intensity — total energy per unit floor area per year
- 1
Electricity in kBtu
50.000 × 3,412 = 170.6071 kWh = 3.412 kBtu. - 2
Gas in kBtu
300 × 100 = 30.0001 therm = 100 kBtu. - 3
Total site energy (kBtu)
170.607 + 30.000 = 200.607 - 4
EUI (kBtu/sq ft/yr)
200.607 ÷ 5.000 = 40,1
Como esta calculadora funciona?
EUI = total annual site energy ÷ floor area. Convert electricity (kWh → kBtu: × 3.412) and gas (therms → kBtu: × 100), add them, divide by sq ft for US units. ENERGY STAR offices target ≤ 50 kBtu/sq ft/yr; the US median is ~75. In metric, good offices aim for 80–150 kWh/m²/yr.
Fórmula
How this is calculated
A building's site energy use is the total energy delivered to its boundary — primarily electricity and natural gas (other fuels such as fuel oil, district steam or solar thermal can also contribute). Converting everything to a common unit (kBtu in the US customary system, or kWh in the metric system) and dividing by gross floor area gives EUI, a single dimensionless-per-area figure that removes the size effect so a 500 m² office can be compared directly with a 50,000 m² office tower.
US EPA's ENERGY STAR programme uses EUI as its primary benchmarking metric. Median EUIs vary significantly by building type (2018 CBECS data): offices average around 75 kBtu/sq ft/yr, schools around 53, warehouses around 30, and hospitals around 250. A building scoring in the top quartile for its type earns an ENERGY STAR score ≥ 75 and typically has an EUI 30–40% below the median. In the EU, the EPBD directive requires near-zero energy buildings (NZEB) to achieve roughly 30–100 kWh/m²/yr depending on climate.
This calculator covers site energy only (energy at the meter). Source energy (which also accounts for generation and transmission losses) is about 3× higher for electricity in grid-average terms. For ENERGY STAR certification, both site and source EUI are reported; this tool shows site EUI.
Perguntas frequentes
In the US, an office building at or below 50 kBtu/sq ft/yr qualifies for ENERGY STAR (roughly the top 25% of similar buildings). The average US office is around 75 kBtu/sq ft/yr. In Europe, a good-performing office targets 80–120 kWh/m²/yr, with passive-standard buildings below 30 kWh/m²/yr.
Site EUI counts only the energy delivered to the building meter. Source EUI tracks energy back to the point of extraction, including electricity generation and transmission losses (roughly 3 kBtu source per 1 kBtu of electricity at the meter in a typical US grid). Source EUI is used for ENERGY STAR scoring; site EUI is used for billing and this calculator.
Electricity is on your utility bills (in kWh) — add up 12 months. Natural gas bills in the US show therms or CCF (1 CCF ≈ 1.02 therms); in Europe they may show m³ which your supplier converts to kWh using a calorific value factor, typically around 10–11 kWh/m³.
Também conhecido como
TG we-Calculate Editorial Team. (2026). EUI Calculator — Energy Use Intensity [Online calculator]. TG we-Calculate. https://we-calculate.com/pt/calculator/eui-calculator
TG we-Calculate Editorial Team. "EUI Calculator — Energy Use Intensity." TG we-Calculate. 2026. https://we-calculate.com/pt/calculator/eui-calculator.
TG we-Calculate Editorial Team, "EUI Calculator — Energy Use Intensity," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/pt/calculator/eui-calculator
@misc{wecalculate_eui_calculator, title = {EUI Calculator — Energy Use Intensity}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/pt/calculator/eui-calculator}}, year = {2026}, note = {TG we-Calculate} }
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