Estimate the electricity used by a household appliance and what it could cost to run on your tariff.
Look for watts or kilowatts on the appliance label, product manual or manufacturer specification. Appliances with thermostats or variable power may not draw their full rated wattage throughout every use.
A high-power appliance used briefly can cost less than a lower-power appliance left running for many hours. Use a realistic average running time rather than the time the appliance is merely switched on.
Enter the rated wattage, average cycle time, weekly uses and unit rate to estimate annual electricity consumption and cost.
Watts are divided by 1,000 to convert power to kilowatts.
Kilowatts are multiplied by hours used to estimate kWh consumption.
Energy use is multiplied by the electricity unit rate. Standing charges are excluded because they apply to the household supply rather than one appliance.
Not necessarily. Appliance behaviour, tariff changes, standby use, household habits and billing periods can make the real figure different.
Only if standby hours and wattage are included in the figures entered. The main estimate assumes the stated power applies during the running time.
Check a recent bill, tariff statement or supplier account for the unit rate in pence per kWh.
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