💯 Maths

# How do you calculate the energy rating of an appliance?

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Humaira PatelPassionate tutor and London teacher with Qualified Teacher Status.17.5k students helped

You can use this formula to estimate an appliance's energy use: (Wattage × Hours Used Per Day) ÷ 1000 = Daily Kilowatt-hour (kWh) consumption 1 kilowatt (kW) = 1,000 Watts Multiply this by the number of days you use the appliance during the year for the annual consumption. You can then calculate the annual cost to run an appliance by multiplying the kWh per year by your local utility's rate per kWh consumed.