Electricity Cost Calculator
Find out how much it costs to run any electrical appliance. Enter the wattage, how many hours you use it per day, your electricity rate, and the number of days to see a full cost breakdown.
Daily Energy
Period Energy
Daily Cost
Period Cost
Annual Estimate
Estimates assume constant wattage and usage. Actual costs depend on your utility's rate structure, taxes, and appliance efficiency variations.
How It Works
Energy consumption is calculated with a simple formula: kWh = (Watts × Hours per day × Days) ÷ 1,000. Multiplying the kWh by your electricity rate gives you the total cost.
For example, a 1,500 W space heater used 4 hours per day for 30 days consumes 180 kWh. At $0.12/kWh, that costs $21.60 for the period and roughly $262.80 projected over a full year.
Frequently Asked Questions
Where do I find my appliance's wattage?
Check the label on the appliance, its manual, or the manufacturer's website. It's usually listed in watts (W). If you only see amps and volts, multiply them: Watts = Volts × Amps.
How do I find my electricity rate?
Your electricity rate appears on your utility bill, usually listed as a cost per kWh. In the US, average residential rates range from $0.10 to $0.30 per kWh depending on your location.
Do appliances use electricity when turned off?
Many appliances draw "standby" or "phantom" power when plugged in but not actively in use — typically 1–5 watts. Over many devices and a full year, this can add up significantly.