"We used to think that if we knew one, we knew two, because one and one are two. We are finding that we must learn a great deal more about 'and'." -- Sir Arthur Eddington

Energy Saver Calculator

This energy savings calculator will help you determine how much energy you will save by converting to CFL lamps in your house or business. Fill in the yellow areas to begin calculating your savings.

You can enter the number of watts of a single light bulb (or you can total up your wattage). Typical wattage for a light bulb is 40, 75, 100 etc. Then enter the number of hours this light is on throughout the day. You can also enter other information in the yellow boxes about the total wattage of the CFL replacements, the cost of you electricity, lamp cost etc.

 
Standard Lamps
CFL Lamp
Watts Used
Number of hours burned per day
Number of hours burned per year
Total Watt hours per year
kWh per year
Kilowatt Hour Rate
Total Energy Cost per bulb/year
Total Energy Cost over CFL lamp life
Total Energy Consumption
Lamp Cost
Rated Lamp Life
Number of incancescent bulbs per 1 CFL
Total Lamp Cost
Total Lamp Life Cycle Cost
Total Life Cycle Saving for 1 bulb
How many bulbs will you change?
Total Life Cycle Savings


CFL lights will pay for themselves in 0 months
and reduces 0 lbs of CO2/year

Don't know what your lamp's lifespan is?

 

Incandescent
CFL

Dimmable CFL

Types of bulbs:

Known as:

Lifespan

Cost

Watts

Lifespan

Cost

Lifespan

Cost

Lumens / Watt

A-19

Light bulb / Helix or Spiral

750

$1.25

10

10,000

$2,10

25,000

$12,50

69

Torpedo

Torpedo

1,500

$1,25

11

25,000

$4.20

25,000

$10.50

41

G-25

Globe

1,500

$1,40

11

25,000

$4.40

25,000

$9.50

41

R-20

2.5” Floodlight

2,000

$1,70

11

8,000

$6.20

25,000

$9.50

41

R-30

3.7” Floodlight

2,000

$3,15

11

10,000

$8.70

18,000

$13.96

54

PAR 38

Large Flood

2,500

$5,80

12

8,000

$6.60

18,000

14.00

48