Calculate Your Power Consumption |®

Energy Usage Calculator

Calculate your power consumption

Calculate your household energy usage

The amount of electricity your home consumes each month is an important figure to understand. Why? Because the fastest way to reduce your monthly electric bill is by lowering your energy usage. Every device or appliance in your home consumes a certain amount of electricity, measured in kWh. The total amount of kWh used in your home is your power consumption level. Your power consumption directly affects your energy bills, so lowering one will likely bring down the other.

Use the SaveOnEnergy® kWh Calculator to get your electric bill estimate

Figuring out how much energy you use can be tricky. That’s why SaveOnEnergy developed our kWh electricity calculator. All you need to do is fill in the information above and we’ll do the math for you. We can also show you energy plans tailored to your power consumption level.

How can I tell how much electricity I use each day?

The SaveOnEnergy kWh calculator is the quickest way to estimate your electricity bill, but you can also calculate your energy usage manually. Every appliance or electronic device you use is reflected in your monthly energy bill, alongside your heating, cooling, and lights.

While climate control and lights are harder to manage, it’s easy to find out how much your devices are adding to your total power consumption level. You can adjust your usage – and lower your bill – by unplugging or simply using those devices less. To manually calculate your power consumption, all you need is this simple formula:

  1. Calculate the watts each device uses per day
  2. Convert watts to kilowatts. There are 1000 watts in one kilowatt.
  3. Determine the kilowatts an appliance uses per month.
  4. Figure out the cost by multiplying the kilowatts per month by your electric rate.

To start you’ll need the device’s wattage and an estimated number of hours you use it per day. If you find that your bill is too high, it might be time to shop for a new energy plan. The SaveOnEnergy marketplace shows today’s electricity rates from top energy companies in your area at no cost to you. To explore the energy providers, rates, and plans in your area, enter your ZIP code above.

With that said, let’s start calculating.

How can I find the wattage of a device?

Most devices have a label listing how many watts they use. You can find this wattage label either on the device (usually on the bottom or back) or in the owner’s manual.

If you can’t find the wattage label, here are a couple of other options to determine how much power the device uses.

  • Purchase a wattage measuring device, such as the Kill A Watt®, which displays the wattage of a device when you plug it in.
  • Contact the manufacturer with your device’s model number.
  • Look up your device and model number online.

We’ve also provided a list that shows the common wattage of everyday household devices. Though the wattage of your particular device may vary, it should give you a rough estimate.

Appliance wattage chart

According to the Environmental Protection Agency, here are typical wattage levels of everyday devices:

Coffee Maker 900-1200 watts
Toaster 800-1400 watts
Iron 100-1800 watts
Ceiling fan 65-175 watts
Space heater (40gal) 4500-5500 watts
Hair dryer 1200-1875 watts
Laptop 50 watts
Computer monitor 150 watts
Computer tower 120 watts
Television 19"-36" 65-133 watts
Television 53"-61" 170 watts

How to calculate kWh usage

The first step in calculating your energy consumption is to figure out how many watts each device uses per day. Just multiply your appliance’s wattage by the number of hours you use it in a day. This will give you the number of watt-hours consumed each day.

Calculate Watt-hours Per Day

Device Wattage (watts) x Hours Used Per Day = Watt-hours (Wh) per Day

Example: A 125-watt television used three hours per day
125 watts x 3 hours = 375 Wh/Day

How many watts are in a kilowatt?

Electricity on your bill is measured in kilowatt-hours (kWh), not watt-hours. One kilowatt is equal to 1000 watts, so to calculate how many kWh a device uses, divide the watt-hours from the previous step by 1000.

Convert Watt-Hours to Kilowatts

Device Usage (Wh) / 1000 (Wh/kWh) = Device Usage in kWh

Example: A television using 375 Wh of electricity per day
375 / 1000 = 0.375 kWh


Now that we know how many kilowatt-hours the appliance uses per day, we have to estimate that usage over a month. Let’s multiply by 30 days to simulate an average month.

Find Your Usage Over a Month

Daily Usage (kWh) x 30 (Days) = Approximate Monthly Usage (kWh/Month)

Example: A television using 0.375 kWh of electricity per day
0.375 kWh x 30 Days = 11.25 kWh/Month


So, a 125-watt television that you use for three hours per day adds up to 11.25 kilowatt-hours of energy per month. This is your television’s energy consumption. How does that translate to your electricity bill? Let’s move to the next step.

How to calculate my electricity bill

Now that you know approximately how much energy your appliances and devices consume over the course of a month, we can estimate what that part of your energy bill will cost.

For this step, you’ll need to look at your last electric bill to see how much you pay per kWh, otherwise known as your electric rate.

If you have a variable-rate plan, this rate can vary monthly, which makes it difficult to estimate future electric bills. Fixed-rate plans allow customers to more accurately estimate their electricity bills. You can search for fixed-rate options by entering your ZIP code in the box below. Otherwise, let’s continue our math.

The find out how much your appliances cost per month, multiply your electric rate by your monthly usage that we figured out in the steps above.

Figure Out the Cost

Monthly Usage (kWh) x Electric Rate ($/kWh) = Approximate Cost per Month

Example: A television using 11.25 kWh/Month with an electric rate of $0.10/kWh
11.25 kWh x $0.10 = $1.13/Month


Based on these calculations, this television would cost you $1.13 per month. While that might not seem like much, the appliances and devices throughout your home can really start to add up.

Remember, your appliances and devices only account for part of your energy bill. However, your electric bill also includes heating, cooling, and lighting, which will add to your costs. If your home has a meter that you can read, you can multiply the number of kWh for that month by your electric rate (like we did above) to get a more accurate bill estimate.

Or get a quick estimate of your average monthly bill by compiling your bills from the past few months. Add up several months of your energy bills and then divide by the number of months to find the average.

Overall, calculating your energy bill is a matter of knowing your usage and what price you pay for energy. If cutting back your usage doesn’t work or you have a variable rate that makes costs hard to estimate, it might be time to look for a new plan. Enter your ZIP code below to shop options in your area, or check out our Learning Center to read more about energy management.

How to reduce your electricity bill

At the end of the day, most consumers want to understand their energy consumption so they can lower their electricity bills. According to the Energy Information Administration (EIA), households consume the majority of their electricity in a few key areas. In the average home, heating and cooling account for about 32 percent of the total electricity used. Water heating isn’t far behind, making up almost 14 percent. And a home’s kitchen appliances require a lot of energy to run, too, using 11 percent of total energy consumed.

Here are a few ways you can save electricity – and potentially lower your energy bill – in the most energy-intensive parts of your home:

  • In the winter, the most energy-efficient temperature for your thermostat is 68 degrees Fahrenheit. In the summer, set it to 78 degrees. And whenever you’re away from home, you should lower or raise your thermostat’s setting, so you aren’t paying to heat or cool an empty house.
  • Lower the temperature on your water heater to 120 degrees Fahrenheit. This will reduce your home’s electricity usage while also slowing buildup and corrosion in your home’s water heater and pipes.
  • Energy Star-certified appliances are required to consume less electricity compared to non-certified models. For example, Energy Star washers and dryers use 20 percent less energy.
  • Do you own a heated swimming pool? For every degree warmer you set your pool’s heater, you will pay 10-30 percent more for heating costs.
  • Electronics consume an average of 7 percent of total energy costs. Invest in energy-efficient TVs, computers, and game consoles. You can also dramatically lower electronic energy usage by turning on the “power saving” setting. For example, the power saving setting on the Xbox One lowers the console’s standby energy consumption by 98 percent.

Average energy cost varies by state

Every state has its own energy market – and some energy markets are deregulated. Deregulated markets provide energy choice to consumers. Here’s what that means.

In regulated states, the company that provides your electricity is pre-determined based on where you live. But in deregulated states, residents can choose their provider from a pool of candidates. Deregulated states include Texas, Pennsylvania, Illinois, Ohio, Maryland, Connecticut, New York, and New Jersey. The increased competition in deregulated areas often leads to providers offering lower energy rates and better plans.

Texas is a leader in deregulation. About 85 percent of the state’s energy market is deregulated, including major cities such as Houston, Dallas, Fort Worth, Corpus Christi, Arlington, and many other areas.

Source list:

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