Free Electricity Cost Calculator Online
Calculate how much any appliance costs to run per day, month, and year
Know Your Energy Costs
See exactly how much each appliance adds to your electricity bill
See daily, monthly, and yearly electricity costs for any appliance based on your actual electricity rate.
View energy usage in kilowatt-hours for daily, monthly, and yearly periods to understand your consumption patterns.
Works for any electrical device from LED bulbs to air conditioners. Just enter the wattage from the label.
About Our Electricity Cost Calculator
Our free electricity cost calculator helps you estimate how much it costs to run any electrical appliance. Enter the wattage, daily usage hours, and your electricity rate to see costs and energy consumption across daily, monthly, and yearly timeframes.
Frequently Asked Questions
Where do I find my appliance wattage?
The wattage is usually printed on a label on the back or bottom of the appliance. It may also be listed in the user manual or product specifications.
If only amps and volts are listed, multiply them together to get approximate watts (Watts = Volts x Amps).
For variable-power devices like air conditioners, use the average or rated wattage for a reasonable estimate.
Where do I find my electricity rate?
Your electricity rate per kilowatt-hour is listed on your utility bill, usually in the charges breakdown section.
Common residential rates range from 0.08 to 0.30 per kWh depending on your location and provider.
If you have tiered pricing, use your average rate for the most representative estimate.
How is the monthly cost calculated?
The calculator converts wattage to kilowatts, multiplies by daily hours to get daily kWh, then multiplies by your rate for daily cost. Monthly figures use 30 days.
The formula is: Cost = (Watts / 1000) x Hours x Rate x Days.
This gives you an accurate estimate assuming consistent daily usage throughout the month.
Why are my actual bills different from the estimate?
Actual bills may include additional charges like delivery fees, demand charges, taxes, and other surcharges beyond the energy rate.
Appliance usage may also vary day to day, and some devices use different amounts of power depending on their operating mode.
Use this calculator for individual appliance estimates. Your total bill includes all devices plus fixed charges from your utility.