Knowing the cost of running an electrical appliance is useful, and easy with this power usage calculator.
You need to know three things:
1. Cost of one kilowatt hour (kWh) of electricity. This should be on your power bill.
Example: your electricity costs 24.5 cents/kWh – enter $0.245 in the calculator
You can still use this calculator even if your currency is not dollars – just enter the cost per kWh in your currency and ignore the $ sign.
2. The power used by the appliance. The power rating of an appliance is normally written on a sticker, label or plate (often at the back or under the appliance). For standby power, use a power meter or look in the specifications for the appliance.
Eg1: a light bulb might be 60 watts
Eg2: a electric heater might be 1000 watts
3. How many hours the appliance is used in a day. This is an estimate of the average hours used. To calculate standby power, enter 24.