Use this calculator to estimate your savings, pay-off and lifespan for ENERGY STAR-qualified compact fluorescent lamps.
Your approximate savings, pay-off, and lifespan are:

Estimated energy savings per year   kilowatt hours
Estimated savings per year $
Estimated ENERGY STAR® pay-off   months
Estimated ENERGY STAR® lifespan   years

Update any fields to evaluate another scenario.
Existing incandescent light bulb size watts
Replacement ENERGY STAR® compact fluorescent bulb size watts
Number of light bulbs bulbs
Hours of use per day hours
Cost per incandescent light bulb . dollars
Cost per ENERGY STAR® compact fluorescent bulb . dollars
Electricity cost . cents per KWH

Calculator provided courtesy of the sponsoring organizations of
Northeast Energy Efficiency Partnerships, Inc. (NEEP).
 

Savings are for wattages shown. Your actual savings will vary based on
the wattages you purchase. When comparing incandescent or halogen
bulbs to ENERGY STAR qualified bulbs or fixtures, compare the light
output, or lumens, and not Watts. Watts equal the energy used, not the
amount of light.

Click here to view some of our ENERGY STAR-qualified compact fluorescent light bulbs

Other calculators are available here:
  » Residential ENERGY STAR lighting fixture energy and cost savings calculator

  » Commercial facility lighting retrofit energy and cost savings calculator