Electricity Cost Calculator

Turn the device's wattage into kilowatts by dividing by 1,000, multiply by the hours you run it, and you've got the kilowatt-hours used. Multiply that by your rate per kWh for the cost. A 1,000-watt heater for 5 hours a day uses 5 kWh, so at 17 cents it's about 85 cents a day. The calculator above runs all of that the moment you type.

A 1,000-watt appliance draws 1 kilowatt, so each hour costs one times your rate. At 17 cents per kWh that's 17 cents an hour, about 85 cents over 5 hours, and roughly 25 dollars a month at that daily use. Swap in your own rate and hours above and you'll see the exact figure, since both vary a lot by home and habit.

It's on your power bill, usually labeled as the price per kWh or per kilowatt-hour, and the US average sits around 16 to 18 cents. Some plans charge more during peak hours or above a usage tier, so if your bill shows several rates, use the one that matches when the device runs. The tool defaults near the average, and you can change it.

Anything that makes heat or runs constantly: air conditioners, electric heaters, water heaters, clothes dryers, and the fridge, which sips power but never switches off. Phone chargers and LED bulbs barely register. The reference table below lists typical wattages, so you can spot the big draws and see which ones are worth cutting back.

Target the high-wattage, long-running devices first, since they move the bill most. Trimming an hour off the air conditioner saves more than unplugging a dozen chargers. Switching incandescent bulbs to LED, running the dryer less, and sealing heating or cooling losses all add up. Use the calculator to price a change before you make it, so you'll know the payoff.

Yes to both. There's no sign-up, no limit, and nothing to install, since it loads instantly in the page. The numbers you enter stay on your device and aren't sent anywhere. Bookmark it and you'll have a quick way to price any appliance before you buy it or to settle a debate about what's driving the bill.

One kilowatt-hour, the same thing your bill calls a unit, costs whatever your rate is. The US average sits around 16 to 18 cents, so a single kWh runs about 17 cents, though rates range from roughly 12 cents in cheaper states to 30 cents or more where power is dear. To price any amount, multiply the kWh by your rate: 50 kWh at 17 cents is 8 dollars and 50 cents. The kWh cost table above lists common amounts at three rates so you won't have to do the math.

A 1,000-watt device draws exactly 1 kilowatt, so in one hour it uses 1 kWh and costs one times your rate. At 17 cents that's about 17 cents an hour, 500 watts is half that near 9 cents, and a 1,500-watt heater is roughly 26 cents an hour. Double the watts and you double the cost, so the per-hour table above lets you read off common wattages without touching the calculator.