Electricity Cost Calculator
Find out how much your appliances cost to run. Estimate daily, monthly, and yearly electricity usage in kWh, then compare one device or your whole setup.
Electricity Cost Estimator
Estimate appliance energy use in kWh and what it costs per day, month, and year.
How to Use
- Enter your electricity rate in dollars per kilowatt-hour. If you are not sure, start with the default rate shown on the calculator.
- Use single-device mode to estimate one appliance by entering its wattage, hours used per day, and how many identical devices you run.
- Use the preset dropdown to quickly fill in common appliance wattages like refrigerators, TVs, dryers, and air conditioners.
- Switch to multi-device mode to add several appliances, then review the per-device breakdown and total monthly or yearly cost.
Frequently Asked Questions
How do you calculate electricity cost from watts?
Multiply watts by hours used per day, then divide by 1,000 to convert watt-hours into kilowatt-hours. Multiply that kWh value by your electricity rate to estimate cost.
What is a kWh?
A kilowatt-hour is a unit of energy. It means using 1,000 watts of power for one hour. Utility companies usually bill household electricity usage in kWh.
Why does my monthly power bill differ from the calculator?
Real bills can include tiered rates, delivery fees, taxes, seasonal pricing, and demand charges. This calculator gives a solid usage-based estimate but does not include every utility fee.
How many hours per day should I use for appliances that cycle on and off?
Use the average total run time per day, not just the clock time the appliance is plugged in. For example, a refrigerator may be on all day but the compressor cycles, so an average wattage or preset estimate is often more realistic.
Can I estimate the cost of multiple appliances together?
Yes. Multi-device mode lets you add several appliances, set their wattage and daily usage, and see both per-device costs and combined totals.