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Office of Energy Efficiency Links

Commercial and Institutional Organizations

Learn more about payback, and then use this calculator to determine how long it takes for an energy-efficient lighting measure to pay for itself.

Number of Units

units

Purchase and installation costs per unit

Multiply A × B

$0.00

Total Cost

Old wattage

Watts

New wattage

Watts

Old wattage — new wattage ÷ 1000

kW saved

Number of new units *

units

Usage in hours per day

hours per day

Usage in days per week

days per week

Usage in weeks per year

weeks per year

Average local cost/kWh of electricity

Multiply C through H

$0.00

Annual Savings

Simple payback = Total cost ÷ Annual savings

N/A

years