Enter an appliance's power in watts, how long it runs and what you pay per unit (kWh), and this works out what it costs you per use, per day and per year. Everything happens in your browser; nothing is saved or sent.
This appliance costs about each time you run it.
per week
per year
kWh per year
Not sure of an appliance's wattage? It is usually printed on a label on the back or base, or in the manual. A plug-in energy monitor measures it directly and pays for itself quickly if you have a few mystery devices. For where the big users hide, see electricity in the home.