Understanding what a specific appliance actually costs to run — a space heater, an old refrigerator, a gaming PC — helps make informed decisions about usage habits or whether an upgrade would pay for itself.
This calculator converts an appliance's wattage and daily usage hours into kilowatt-hours, then multiplies by your local electricity rate to estimate daily, monthly, and yearly running cost.
This is useful for comparing the running cost of different appliances, estimating the impact of a specific habit (like leaving something on overnight), or deciding whether a more energy-efficient replacement is worth the upfront cost.
Because everything runs locally in your browser, results appear instantly and nothing you type or upload is ever sent to a server.
Bookmark this page if you expect to use this tool regularly — it loads fast and behaves the same way every time, with no account needed.
This kind of task shows up constantly in everyday writing, coding, design, and admin work, which is exactly why a dedicated, focused tool saves so much back-and-forth.
A tool that does one job well, without a cluttered interface or unrelated features competing for attention, tends to be faster to use than a heavier all-in-one app.
If you find yourself needing this conversion or calculation often, keeping this page open in a tab is usually faster than digging through a bigger software suite's menus.
Because there's no sign-up or installation step, you can jump straight from search result to working tool in a couple of seconds.
Because the whole process happens client-side, there's no waiting on a slow server response or worrying about a service outage affecting your work.
Frequently asked questions
Where do I find my appliance's wattage?
It's usually printed on a label on the appliance itself, in the product manual, or listed on the manufacturer's product page online.
Where do I find my electricity rate?
Check a recent electricity bill, which typically lists the rate per kilowatt-hour, or look up your utility provider's current published rate.