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). It is also common these days for manufacturers to state the standby power of their appliances, although you may need to find the detailed specifications to read this.
The stated power of a light bulb might be 60 watts, or an electric heater might be 1000 watts.
You can also use a simple power meter. Here is a sample of power meters available from Amazon in the USA or UK or Australia. Disclosure: If you buy through these Amazon links Geoff receives a small commission from each sale.
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.