Electricity Cost Calculator
Work out the running cost of an appliance from its power, usage and your electricity rate.
What a device costs to run
An appliance's running cost depends on how much power it draws, how long it runs, and what you pay per unit of electricity. This combines them into a cost per hour, day, month or year, so you can see what a device actually adds to your bill rather than guessing.
Enter the power, usage time and your rate to see the cost.
The surprises are the always-on things
Two insights usually come out of running the numbers. First, high-power appliances used briefly — a kettle, a microwave — often cost less than you expect, because they run for minutes. Second, low-power devices left on constantly can quietly add up, since a small draw times all day every day becomes real money over a year. That is why standby power and always-on gadgets matter more than people assume.
Common questions
What do I need to know about my appliance?
Its power in watts, how long it runs, and your electricity rate per unit. From those, the running cost follows.
Why do always-on devices cost so much?
Because even a small power draw, multiplied by every hour of every day over a year, adds up more than a high-power device used briefly.
Is anything uploaded?
No. The calculation happens in your browser.