Electricity Usage Calculator
Convert appliance power and run time into kilowatt-hours (kWh).
Electricity Usage Calculator
Total energy—
Average daily use—
How the conversion works
kWh = Watts × Hours × Days ÷ 1,000
For devices that cycle, a plug-in energy meter can provide a more realistic average than nameplate wattage.
Frequently asked questions
What is a kWh?
A kilowatt-hour is the energy used by 1,000 watts running for one hour.
Does standby power matter?
Yes. Small standby loads can add up when they operate continuously throughout the year.
Estimates only. Actual energy use and costs vary by equipment, climate, tariffs, installation conditions and user behavior.