A 1000 W appliance runs for two hours: how many kWh is that?
Watts describe the rate of energy use, while kilowatt-hours describe accumulated energy. Electricity cost usually starts with energy multiplied by a per-kWh price.
Electricity cost calculator →Convert power into energy
1000 W equals 1 kW. Running continuously for two hours uses 2 kWh. Repeating that use daily for thirty days gives 60 kWh. At an illustrative price of 0.2 currency units per kWh, the appliance-energy cost is twelve. The watt-to-kilowatt conversion must happen before multiplying by hours.
Include quantity without counting it twice
Two identical appliances under the same assumptions use 120 kWh over the period. Do not multiply the entered power by two and also enter a quantity of two, which would count the duplication twice. Use actual operating time rather than automatically assuming that every hour plugged in is an hour at the rated power.
Keep the bill’s other components separate
Fixed charges, taxes, time-of-use rates and tiered pricing are not automatically included. Rated power may also differ from average operating power, particularly for equipment that cycles on and off. The output is an appliance-energy estimate under the supplied assumptions, not a guarantee of the total utility bill. Record the power basis, hours and tariff with the result so it can be compared meaningfully with measured consumption later.
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