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Estimate your lighting electricity cost and how much you could save by switching to LED bulbs. Enter bulbs, hours per day, wattage, and your kWh price.
Count the bulbs you want to estimate (one room or the whole home).
Use a typical day. Evening lights often push this number up.
This is the wattage of your current bulbs before switching.
Enter the price you pay per kWh from your electricity bill.
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The Energy Savings Calculator helps you put lighting electricity costs into perspective. By entering how many bulbs you have, how many hours they are on, and your electricity rate per kWh, you get an estimate of your annual lighting cost.
Most people think about LEDs in general terms. This calculator makes it practical: it converts your current bulb wattage into kWh and compares it to a simple LED baseline so you can see potential savings in yearly dollars and kWh.
Use it for quick “what if” planning. If the savings look small, that can still be useful. You will know where the savings are and what inputs matter most (hours per day, bulb wattage, and electricity rate).
Looking for more “cost vs time” calculators? Try the Subscription Cost Calculator or the Coffee Cost Calculator.
Our calculator uses proven formulas and up-to-date data to give you accurate results. Here's a transparent look at the methodology behind your calculation.
The Formula
Total watts = bulbs × current wattsDaily kWh = (total watts × hours/day) ÷ 1000Yearly cost = yearly kWh × electricity rate per kWhLED savings = cost(current) − cost(LED 15W)We convert your lighting power into kWh using your daily hours. We then multiply by your electricity price per kWh to estimate annual costs, and finally compare your current setup to an LED baseline of 15W per bulb.
Bulb count, hours per day, current wattage, and your kWh electricity rate
Convert watts to kWh and multiply by your electricity rate to estimate yearly cost
Compare your current annual cost to the annual cost of 15W LED bulbs
Disclaimer: Results are estimates based on the information provided. For professional advice, consult with a qualified expert in the relevant field. This calculator is for informational purposes only.