Your result will appear here
Enter values and press Calculate.
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Light Bulb Cost Calculator
Calculate how much a light bulb costs to run based on watts, hours and electricity rate.
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How to use this calculator
- Enter the values requested in the calculator form.
- Press Calculate to generate the result instantly.
- Compare the answer with the formula and examples below.
Examples
- A 10 W bulb used 5 hours daily for 30 days uses 1.5 kWh.
Frequently Asked Questions
Can I compare LED and old bulbs?
Yes. Calculate each bulb separately and compare costs.
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