CFL savings calculator

Use this CFL savings calculator to figure out how much money you can save by installing compact fluorescent lights to replace incandescent lights.

The calculator assumes an average incandescent bulb lifetime of 1,000 hours and an average compact fluorescent bulb lifetime of 8,000 hours. You can change this if you wish based on the advertised lifetime hours of either the original or replacement bulb, or both.

For LED house lights, see my LED savings calculator.

Return from CFL savings calculator to Energy efficient lighting or to the Green Energy Efficient Homes site home page.

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Your electricity cost, in $/kwh
Wattage of incandescent bulb being replaced
Wattage of CFL to replace the incandescent
Cost per incandescent bulb (for when bulb burns out)
Cost per CFL replacement bulb
Incandescent bulb life (hours)
CFL bulb life (hours)
Number of bulbs of this type being replaced
Number of hours/day light is in use

Savings per year
Payback in years