Kilowatt-hours and money saved by swapping a lamp's wattage.
| kWh saved | – |
| Money saved | – |
Use this calculator when you replace an incandescent or halogen with an LED of similar brightness.
kWh saved = ((old watts − new watts) / 1000) × hours per day × days. Money saved is that kWh × price per kWh. 60 W to 8 W, 4 hours a day for 365 days at 0.25 per kWh saves about 75.92 kWh and 18.98. Negative savings mean the new lamp draws more. Lumens are not compared here.
Old watts: Power of the lamp you have.
New watts: Power of the replacement.
Hours per day: Hours it is on each day.
Price per kWh: Energy price per kilowatt-hour.
Days: How many days to total.
kWh saved: Energy not used.
Money saved: Bill reduction.
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