Electricity Cost Calculator — free
Calculate electricity cost based on watts and hours.
Daily cost
$0.10
Monthly cost
$2.88
Annual cost
$35.04
0.800 kWh consumed per day
How to use Electricity Cost Calculator
Enter Power Consumption in Watts
Locate the 'Power (Watts)' input field at the top of the calculator. Type the wattage of your device or appliance. For example, enter 1000 for a 1000-watt microwave or 60 for a standard light bulb. You can find wattage on device labels or manuals.
Input Usage Hours
Click on the 'Hours of Use' field and enter how many hours per day, per month, or per year the device runs. Enter decimal values if needed (e.g., 2.5 hours). The calculator accepts any time period you specify.
Set Your Electricity Rate
Enter your local electricity rate in the 'Cost per kWh' field. Find this rate on your utility bill (usually $0.10-$0.20 per kilowatt-hour in the US). Leave default if unsure, then adjust for your region.
View Instant Results
Click the 'Calculate' button to see your total electricity cost displayed immediately below the form. Results show cost breakdowns for different time periods and daily, monthly, and yearly estimates.
Reset or Modify Values
Click 'Reset' to clear all fields and start a new calculation. Modify any input field and recalculate to compare costs for different devices or usage patterns.