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Running cost of an appliance.
This calculator estimates how much an electrical appliance costs to run. It converts the appliance's power rating and how long you use it into energy in kilowatt-hours (kWh), then multiplies by your electricity tariff.
Use it to compare appliances, judge the impact of an always-on device, or budget a monthly electricity bill for a single load.
One kilowatt-hour (unit) is 1000 watts running for one hour. Dividing watts by 1000 converts the power to kilowatts before multiplying by time.
It is usually printed on a rating label, the nameplate, or in the manual. If only current and voltage are given, multiply them: watts = volts × amps.
A kilowatt-hour is the energy used by a 1000 W appliance running for one hour. Electricity bills charge per kWh, which utilities often call a 'unit'.
Not necessarily — cost depends on wattage and running time together. A 2000 W kettle used for 5 minutes can cost far less than a 40 W bulb left on all day.
Real usage hours vary, tariffs can be tiered or include fixed charges and taxes, and thermostat-controlled devices do not draw full power continuously. Treat the result as a close estimate.