Electricity Cost Calculator
Calculate the cost of electricity consumption for your appliances and devices. Enter power rating, usage time, and electricity rate to estimate daily, monthly, and yearly costs.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Electricity Cost Calculator
This calculator estimates the cost of running an electrical appliance based on its power rating, usage time, and your local electricity rate.
- Enter Power Rating (Watts): Input the wattage of your device (e.g., 100W for a light bulb). Must be a positive number.
- Enter Hours Used Per Day: How many hours per day the device runs (e.g., 5). Must be a positive number.
- Enter Electricity Rate (per kWh): Your cost per kilowatt-hour (e.g., 0.12 for $0.12/kWh). Find this on your utility bill.
- Click "Calculate": Press the button or hit Enter. The calculator will show:
- Daily, Monthly, and Yearly Costs in dollars.
- Formula breakdown showing kWh used and the calculation.
Note: All inputs must be greater than zero. The calculator uses standard units (Watts, hours, $/kWh). No metric conversion needed.
Previous Results
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Frequently Asked Questions
The cost is calculated as: Cost = (Power in Watts / 1000) × Hours Used × Rate per kWh. Monthly cost uses 30 days, yearly uses 365 days.
Enter power in watts, hours per day, and electricity rate in dollars per kilowatt-hour (kWh).
Yes, as long as you know the power rating (usually printed on the device) and the average daily usage.
