Smart Building ROI Calculator

Building IoT system payback from energy and maintenance savings.

Building size (sq ft)

Energy cost ($/sq ft/yr)

HVAC energy share (%)

Lighting energy share (%)

Annual maintenance ($)

Implementation ($/sq ft)

HVAC savings (%)

Lighting savings (%)

Tab to move between fields

Annual savings ($)

$40,563.00

≈ 4 years of state college

Implementation cost ($)$250,000.00

Payback period (years)6.2

5-year ROI (%)-19

Energy reduction (%)16.8

Energy savings ($/yr)$29,313.00

How to Use This Calculator

Enter building size in sq ft and current annual energy cost per sq ft.
Set HVAC and lighting energy shares as percentages of total energy.
Enter implementation cost per sq ft and expected HVAC and lighting savings percentages.
Input annual maintenance cost to capture O&M savings.
Review Annual savings ($), Payback period (years), and 5-year ROI (%) to evaluate the upgrade.

How the result changes with Building size (sq ft)

Building size (sq ft): Total conditioned floor area in square feet.
Energy cost ($/sq ft/yr): Annual energy cost per square foot. US avg office: $2.50-$4.50/sq ft.
HVAC energy share (%): HVAC as percentage of total energy. Offices: 35-45%, warehouses: 15-25%.
Lighting energy share (%): Lighting as percentage of total energy. Offices: 20-30%.
Annual maintenance ($): Total annual building maintenance budget.
Implementation ($/sq ft): Smart building upgrade cost per sq ft. Retrofit: $3-8, new construction: $1-5.
HVAC savings (%): Expected HVAC energy reduction. Typical: 15-30% with occupancy + weather optimization.
Lighting savings (%): Expected lighting energy reduction. Typical: 30-50% with occupancy + daylight harvesting.

Annual savings ($): Total annual savings from energy + maintenance reductions.
Implementation cost ($): Total one-time cost for smart building upgrade.
Payback period (years): Simple payback period. -1 = no payback.
5-year ROI (%): Return on investment over a 5-year period.
Energy reduction (%): Overall energy cost reduction percentage.
Energy savings ($/yr): Annual energy cost savings from HVAC + lighting optimization.

Identify Input Parameters
4 parameters
Building size (sq ft) = 50000, Energy cost ($/sq ft/yr) = 3.5, HVAC energy share (%) = 40, Lighting energy share (%) = 25 = 8 input(s) provided
Calculate Annual savings
Annual savings = totalEnergySavings + maintenanceSavings
40563 = $40,563
Calculate Implementation cost
Implementation cost = buildingSqFt * implementationCostPerSqFt
250000 = $250,000
Calculate Payback period
6.2 = 6.2