Calculate the electricity cost of running your Christmas lights. See how much you can save by switching to LEDs and get tips for a more energy-efficient festive season.
Cost per day
£0.04
Total Festive Cost
£1.10
Running the same number of older, incandescent lights would cost approximately £8.82. By using LEDs, you are saving around £7.72!
Christmas lights bring festive cheer, but they can also bring higher electricity bills. Understanding the costs helps you make smarter choices. This Calculator Site tool breaks down how much your lights cost to run and shows you how to save money.
The calculator multiplies the number of light strings by their wattage to get a total power figure. It then calculates the total energy used (in kilowatt-hours) based on how many hours and days you run them. This energy figure is multiplied by your electricity rate to determine the final cost. For a broader view of your holiday spending, try our Christmas Budget Calculator.
Top Tip: Switch to LEDs for Big Savings
As the calculator shows, switching from old incandescent bulbs to modern LEDs is the single biggest way to save money. LEDs use up to 90% less energy, last much longer, and are safer because they generate very little heat. The savings on your electricity bill can be substantial.
Our calculator uses a simple formula to estimate your costs. By understanding the components, you can see how to influence your total bill.
5W
Typical LED String
40W
Old Incandescent String
90%
Potential Energy Saving
The tool multiplies your number of strings by their wattage, then by the hours and days of use, to find the total energy in kilowatt-hours (kWh). This is the unit you are billed for. You can also explore how energy costs contribute to your overall household budget with our Household Budget Calculator.
How to use this Calculator Site tool
Enter the number of light strings you have, their wattage (use the presets for LED or Incandescent or enter a custom value), how many hours a day and for how many days you will use them. Finally, input your current electricity rate (you can find this on your utility bill) for the most accurate cost estimate. The calculator will instantly show you the daily and total cost.
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