Estimate how much it costs to run any appliance.
Cost = power (kW) × hours used × electricity rate ($/kWh).
A 1,500 W heater run for 5 hours at $0.15/kWh costs about $1.13.
Enter the appliance wattage and the hours it runs; the calculator converts watts to kilowatts automatically.
Check your utility bill for the price per kWh, which varies by provider and region.
Only if you include standby hours and wattage in your inputs.