About Electricity Cost Calculator
Electricity is billed by the kilowatt-hour (kWh), the energy a 1,000 watt appliance uses in one hour. This calculator uses energy per day = watts ÷ 1,000 × hours per day × number of appliances, and cost = energy × rate per kWh. A month is taken as 30 days and a year as 365. It assumes the appliance draws its rated power the whole time, so devices that cycle, such as fridges, will cost less.
How to use Electricity Cost Calculator
- Fill in "Appliance power", "Use per day", "Rate per kWh" and "Number of appliances".
- The result appears below and updates as you type.
- Copy the result with the copy button, or download it as a file where that is offered.
Questions about Electricity Cost Calculator
Where do I find my rate per kWh?
It is printed on your electricity bill or in your supplier tariff, as a price per kWh or unit. If the bill has tiers or time-of-use prices, use the rate that applies to most of your consumption.
Where do I find the wattage of an appliance?
Check the rating label on the back or underside, or the manual. If it lists only volts and amps, multiply them to estimate watts: 230 V × 2 A is about 460 W.
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