EUI Calculator – Energy Use Intensity

Written by Great Medico

Updated September 25, 2026 •2 min read

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If your goal is to normalize annual building energy by floor area, you usually do not need a long worksheet—you need the right relationship and sensible inputs. The EUI Calculator – Energy Use Intensity applies that relationship directly and shows the result in a form that is easy to compare with another scenario or a manual check.

What this calculator does

The calculator’s primary output is energy use intensity. It also exposes useful supporting values such as kWh/ft²·yr, Annual energy. Its scope is deliberately narrow: it uses the fields shown for EUI – Energy Use Intensity and does not silently add outside prices, specifications, measurements, or assumptions that are not present on the page. That makes the result traceable: if an input changes, you can connect the movement in the output to the calculation described below.

How to use it

Enter Annual building energy and Floor area. Enter current local prices or product specifications where the page asks for them instead of assuming the defaults match your situation. After calculating, change one uncertain input at a time—such as usage, efficiency, dimensions, or price—to see which assumption dominates the result.

How the calculation works

Energy use intensity = annual building energy ÷ floor area after units are normalized. The page reports kWh per square meter per year and a converted kWh/ft²·yr value.

Example

With the default scenario—Annual building energy (100000 kWh); Floor area (10000 ft²)—the calculator returns 107.64 kWh/m²·yr for energy use intensity. Change one of those inputs and the result should move in the direction implied by the formula or lookup above. That is a useful way to catch a unit mistake or an unrealistic assumption before relying on the estimate.

How to interpret the result

Lower EUI means less annual energy per unit floor area under the entered energy total; useful comparisons require similar building type, climate, occupancy, and energy-boundary definitions. For decisions based on the EUI Calculator – Energy Use Intensity, keep the unrounded inputs and use the displayed decimals as an estimate rather than implying more precision than the measurements support.

Limitations and notes

For the EUI Calculator – Energy Use Intensity, this is a compact planning model. Real prices, tariffs, product efficiency, waste, taxes, local standards, installation conditions, and manufacturer instructions can change the final cost or quantity. Use current local inputs and round practical purchases in the direction that avoids shortage when appropriate.