Everyday Tools
Electricity Cost Calculator
- Browser-based
- No signup
Enter appliance watts, hours per day, number of days, and your electricity rate per kWh to estimate energy use and running cost, including a 30-day monthly estimate.
100% Client-Side
Your data never leaves your computer.
How to use this tool
1. Enter appliance power in watts. 2. Enter hours used per day and number of days. 3. Enter your electricity rate per kWh. 4. Click Calculate. 5. Review kWh consumed and estimated cost for the period.
Worked example
Example: a 1,000 W heater run 2 hours/day for 30 days at $0.15/kWh uses 60 kWh and costs about $9.00.
How it works
Enter an appliance’s power in watts, how many hours it runs per day, the number of days, and your electricity rate per kilowatt-hour. Energy use is watts ÷ 1000 × hours × days. Utility fees and tiered rates are not included.
Limitations
Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Frequently asked questions
How is energy use calculated?
Kilowatt-hours equal watts divided by 1000, times hours per day, times the number of days.
Where do I find watts and the kWh rate?
Watts are usually on the appliance label or manual. Your electricity rate is on your utility bill as price per kWh.
Does this include utility fees?
No. Results estimate energy cost from usage and rate only.
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