Energy Consumption Calculator
Estimate your daily energy usage and cost based on appliance wattage, hours used, and electricity rate.
Published by:
isCalculator Editorial Team
Reviewed by:
Review Board
Last Updated:
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How to use this tool?
How to Use the Energy Consumption Calculator
- Enter Appliance Name (optional): Type a label like "Refrigerator" for reference.
- Input Power (Watts): Enter the appliance's wattage (e.g., 100). Must be a non-negative number.
- Set Hours Used Per Day: Enter how many hours the appliance runs daily (0–24, in 0.5 increments).
- Provide Electricity Rate ($/kWh): Enter your cost per kilowatt-hour (e.g., 0.12). Must be non-negative.
- Click "Calculate": Press the button to see results.
Results Explained:
- Daily Energy Use (kWh): Energy consumed per day = (Watts × Hours) / 1000.
- Daily Cost ($): Daily energy × rate.
- Monthly Cost ($): Daily cost × 30 days.
All inputs must be valid numbers. Invalid entries show red error highlights.
Previous Results
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Frequently Asked Questions
Energy (kWh) = (Power in Watts × Hours Used) / 1000. Cost = Energy × Electricity Rate.
Average rates vary by location but commonly range from $0.10 to $0.30 per kWh.
Yes, as long as you know the wattage and usage hours, you can estimate consumption for any device.