Private in-browser planning
Commercial Energy Cost Per Square Foot Calculator
Starting values are hypothetical. Replace them with your own figures. Inputs stay in this browser and are not included in the energy inquiry.
- Use a complete year and matching cost / floor-area boundaries.
- $/ft²/year measures spending, not ENERGY STAR performance.
Choose the correct cost and area boundary
Use a consistent property boundary. Whole-building costs should be divided by the gross floor area they serve; a tenant’s bill should not be divided by the entire shopping center. If common areas, separate meters or landlord-paid services are excluded, document those exclusions. Mixing gross area and occupied area can change the result even when the bill stays the same.
Collect a complete year so seasonal heating and cooling costs are represented. Add electricity and gas separately, including the bill components that belong in your chosen spending scope. Enter other energy costs only if they serve the same property and period. Do not count a shared fuel invoice twice because it appears in both a landlord statement and a tenant reimbursement.
How the cost metric is calculated
Total annual energy cost equals entered electricity cost plus gas cost plus other fuel cost. Divide that total by square feet to obtain annual dollars per square foot. The tool also shows the electricity, gas and other-fuel contributions separately. Floor area must be greater than zero; costs can be zero when a commodity genuinely does not apply.
A hypothetical property with $60,000 in electricity costs, $15,000 in gas costs and 50,000 square feet has total annual spending of $75,000 and cost intensity of $1.50 per square foot per year. Its electricity contribution is $1.20 and its gas contribution is $0.30. These calculations describe the inputs, not whether the building performs well.
Compare like properties and explain changes
Track the same property over comparable twelve-month periods before making cross-property judgments. A change in cost per square foot can result from a rate change, weather, longer hours, vacancy, equipment or a change in the metered area. Preserve both consumption and cost records so you can distinguish higher prices from increased energy use.
For a portfolio, group facilities by actual use, metering scope and operating pattern. A restaurant, office and refrigerated warehouse serve different functions. Their spending intensities should not be ranked as though building size were the only difference. A useful review identifies why a location differs and which part of its bill or operations deserves investigation.
Cost intensity is different from energy intensity
Energy-use intensity expresses energy rather than money per unit of area. It combines fuels on a common energy basis, typically annual kBtu per square foot for a U.S. building. A price increase can raise cost intensity while energy intensity is unchanged. Conversely, lower supply prices can mask a rise in physical consumption.
Use the linked building energy-intensity tool when you want an unadjusted site-energy measure. Neither tool creates an ENERGY STAR score or weather-normalized comparison. For a management discussion, present cost intensity, physical usage, building scope and operating context together. That gives owners a clearer explanation than a single number labeled efficient or expensive without supporting evidence.
Sources & scope
Primary references reviewed October 15, 2026. These sources support the stated concepts; actual tariffs, program rules and signed agreements govern the account. Decision examples and operational worksheets are original educational analysis.
- ENERGY STAR: What is Energy Use Intensity?
Annual energy divided by gross floor area; distinction between site and source EUI and different property types. - DOE FEMP: Evaluating Your Utility Rate Options
Energy charges, demand charges, fixed charges and tariff structures; practical limits of simplified rate calculations.