Light Bulb Calculator  

Your approximate savings, pay-off, and lifespan are:

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

Update any fields to estimate your savings.  (As you enter values the cost is updated immediately.)
Existing incandescent light bulb size watts
Replacement compact fluorescent bulb size watts
Number of light bulbs bulbs
Hours of use per day hours
Cost per incandescent light bulb . dollars
Cost per compact fluorescent bulb . dollars
Electricity cost . cents per KWH

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