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See what any appliance costs to run, pick a common one or enter your own wattage.
Electricity is billed per kilowatt-hour (kWh), the energy used by a 1,000-watt appliance running for one hour. To find a device's running cost, multiply its power in kilowatts by the hours it runs by your price per kWh. A 2,000-watt (2kW) heater run for 3 hours at 30 cents per kWh costs 2 × 3 × 0.30 = $1.80. The calculator above does this for any appliance once you know its wattage.
The big users are the ones that make heat. Anything that heats or cools, electric heaters, kettles, ovens, tumble dryers, air conditioners, dominates a bill because they draw a lot of power. Low-wattage electronics left on standby cost little each, but add up across a home. Focus savings on the high-wattage, long-running appliances first.
Find the wattage. It is usually on a label on the appliance or in the manual, given in watts (W) or kilowatts (kW); divide watts by 1,000 to get kW. For devices that cycle on and off, like fridges, the running cost is lower than the rated wattage suggests because they are not drawing full power constantly.