Add your appliances with their wattage, daily hours and days of use per month, then enter your electricity rate. The estimator shows your monthly energy use, the cost and a breakdown by device.
Calculated on your device. Nothing is uploaded to a server.
Energy use in kilowatt-hours is watts × hours ÷ 1,000. The estimator multiplies each appliance's wattage by its daily hours, the days per month it runs and the quantity, then adds everything up and multiplies by your price per kWh. For appliances that cycle on and off, such as refrigerators, freezers and air conditioners, enter the average power rather than the nameplate maximum. The fridge preset uses an average of about 60 W. The label on a device or a plug-in energy meter gives the most accurate figures.
TVs, consoles, chargers and set-top boxes draw power even when "off". Several devices at 5 W each running all day add up over a month.
Divide the energy charges on your bill by the kWh used to get your effective rate, including delivery charges and taxes.
Check the label or manual. If it only lists amps, multiply amps by your voltage (for example, 120 V or 230 V) for an approximate wattage.
Real usage varies, and bills include delivery charges, taxes and tiered or time-of-use rates. Use the fixed charge field and an effective rate to get closer.
It lets you model appliances you don't use every day. For example, a washing machine used 12 days a month.
Use the price per kWh from your bill. The default is only an example.
Yes. Your appliances, rate and currency are saved in your browser's local storage.
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