Appliance Running Cost Calculator

Leaving the space heater on overnight costs you money. “Oh yeah, I bet my old fridge uses some electricity when I’m asleep too.”

The problem is that there’s a disconnect between what you think it will cost and number on your electric bill. People generaly fall into that gap. Not because they don’t have a sticker that says “1,000 Watts.” No. It’s also because they aren’t sure if it runs constantly or intermittently, nor do they understand how much energy usage per hour matter.

How to Save Money on Your Electric Bill

Every house has these things. These are devices that get plunked in somewhere and barely reach their capacity most of the time. After you punch in your own habits, calculator above figures out the rest. You don’t have to do the decimal-multiplication-in-your-head anymore.

And the secret: it’s all about knowing what the numbers represent. For example, your washer might be described as a appliance with a nine-hundred-watt rating. But it doesn’t run for the whole hour at maximum power. It has times when it stop spinning, or heating up water, or whatever. If you enter its max value and then assume that it’s always running flat-out, you’ll wildly over-estimate how much it costs.

This is why duty cycle figure is so important. It takes into account the fact that many devices turn on and off (they never really run constantly). Take your TV. Maybe it’s rated as a hundred and twenty watts. Easy: how much energy does it burn when you’re watching? Five hours. Now think of the remaining nineteen hours. Sure, most new TVs is in standby mode, with the smart features on and the clock ticking away. But that draw is just a couple of watt maybe. Seems like nothing! Except that if you multiply by enough devices, it isn’t nothing.

With this tool, you can find that ever-present standby draw and set it apart from active viewing time. Why? Because standby adds up, quietly. You won’t notice it happening, but you’ll pay for it each month.

That’s explained nicely by the reference table on the page (which I’ve pasted below). It explains why a fan doesn’t behave like a fridge. When a fan is on, it’s running at almost full strength. At nearly one hundred percent duty. Even though the fridge is turned on 24/7, its compressor may only be on for thirty or forty percent of the time. The difference between those percentages are huge, in terms of the number of kilowatt-hours used per day. Double the duty cycle percentage and you’ll estimate twice as much energy consumed annually.

This is where people go wrong: All things plugged in is assumed to be functioning at maximum capacity all the time. The electricity cost will depend a lot on where you live, too, and can vary wildly depending on where you are. The calculator defaults to a rate (though switching to your own tariff instantly recalculates). It is a small detail but it is important for planning.

How much does that appliance cost to run? That’s what you want to know if you’re deciding whether to buy a replacement for an older appliance. This allows you to compare the price of new efficient appliance against the old one. Is it worth it to buy the more expensive one? Some appliances aren’t very efficient, their heating elements burn a ton of energy. Others aren’t as bad; sometimes, the difference between the two appliances cost just a couple of bucks per year. In those situations, it might be better for environment to get the more efficient appliance, rather better for your wallet. But in other instances, the savings are significant. For example, when replacing old incandescent lighting, the savings are substantial enough to justify the investment within months.

If your local grid has a carbon intensity factor, you can check that as well and see how much carbon was used. That translates your electricity consumption into kilograms of carbon dioxide. So instead of only thinking about the cost, it shows actual environmental impact of using all this standby power needlessly. That helps inform you that turning off unneeded power isn’t just pennies here and there; it’s also about not wasting resources.

And while the tool won’t shame you for your decisions, it will give you the information needed to make informed ones. But more than anything else, it’s going away from guessing to knowing. It doesn’t take being an engineer to know what your electricity bill says. All you have to do is read the label and roughly estimate how much you really use those furnitures. And then you let the calculator do all the work.

When you realize how much an inefficient heater or old desktop computer will cost you each year, it makes the decision a bit easier. Suddenly you become aware of the hidden cost of convenience. And when you’re aware of it, that tends to lead you to change habits, one plug at a time.

Half the battle is knowing the numbers.