EnergyStar Comparison Calculator

Number of Units
Electricity Rate ($/kWh)
Hours Used Per Day
	ENERGY STAR Qualified Unit	Conventional Unit
Initial Cost per unit (estimated retail price)
Wattage (watts)
Lifetime (hours)

Annual and Life Cycle Costs and Savings for 1 CFLs
	1 ENERGY STAR Qualified Unit	1 Conventional Unit	Savings with ENERGY STAR
Annual Operating Costs*
Energy Cost
Maintenance Cost
Total

Life Cycle Costs*
Operating Cost (energy and maintenance)
Purchase price for 1 unit(s)
Total


	Simple Payback of initial additional cost (years)†

* Annual costs exclude the initial purchase price. All costs, except initial cost, are discounted over the products' lifetime using a real discount rate of 4%.
† A simple payback period of zero years means that the payback is immediate.

Summary of Benefits for 1 CFLs

Initial cost difference
Life cycle savings
Net life cycle savings ( life cycle savings - additional cost)
Simple payback of additional cost (years)
Life cycle energy saved (kWh)
Life cycle air pollution reduction (lbs of Carbon Dioxide)
Air polution equivalence (number of cars removed from the road for a year)
Air polution equivalence (acres of forest planted)
Savings as a percent of retail price