LED Bulb Savings Calculator
See how much switching your halogen, incandescent or CFL bulbs to LED saves a year, how many months it takes the bulbs to pay for themselves, and the saving over 10 years.
Estimate only. These are estimates, appliance ratings and tariffs vary, and actual bulb wattage and brightness vary by manufacturer. Check the packaging for the exact wattage and lumens of your bulbs.
Enter your bulb details
The annual saving, payback period and 10-year saving appear here as you type.
How the LED bulb saving is calculated
Each bulb's annual running cost comes from its wattage, how many hours a day it's on, and your electricity unit rate: energy used (kWh/year) = watts ÷ 1000 × hours/day × 365, and cost = energy × rate. Comparing your current bulb type against a 7W LED at the same hours of use gives the annual saving per bulb, which scales up by however many bulbs you're replacing. Dividing the up-front cost of the LED bulbs by the annual saving, then converting to months, gives the payback period: how long the LEDs take to cover their own cost before every year after that is pure saving.
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