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Christmas Lights Electricity Cost Calculator
Estimate the electricity cost of running holiday lights for the season.
Total wattage of lights
Hours on per day
Days of the season
Electricity price
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How it works
Cost = (watts ÷ 1000) × hours per day × days × price per kWh
Lighting cost is just power times time times price. Switching to LED strings cuts the wattage — and therefore the bill — dramatically versus old incandescent bulbs.
Worked example
120 W for 6 h/day over 40 days uses 28.8 kWh — about $4.32 at $0.15/kWh.
Frequently asked questions
Are LED lights much cheaper?
Yes — LEDs use up to 80–90% less power for the same brightness, so the same display costs a fraction to run.
How do I find total wattage?
Add the wattage printed on each string, or check the box. A timer also cuts hours and cost.
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This calculator is for educational purposes. Double-check important results before acting on them.