Call now

Energy Usage Calculator

Written by Caitlin Ritchie

Last updated 11/19/2021

Use the SaveOnEnergy kWh Calculator to get your electric bill estimate

The amount of electricity your household consumes each month is important. The fastest way to reduce your monthly electric bill is by lowering energy usage, and energy plan rates are structured to best fit certain levels of usage.

Figuring out how much energy you use can be tricky. That’s why SaveOnEnergy® developed our kWh electricity calculator. All you have to do is fill in the calculator below and we’ll do the math.

Why trust SaveOnEnergy?

Learn More

At SaveOnEnergy, we work to offer accurate information with editorial integrity. Our partners do not direct our editorial content, though we may reference their products in our posts. Read more about how we make money.

How to calculate wattage

A watt is a unit measuring the power of an electric circuit. Watts measure how much energy an item uses for every second that it’s on or operating. So, for example, a 750-watt television uses 750 watts of power for every second that it’s on.

But how do you calculate wattage? Often you can find the wattage listed on the item or appliance. This makes calculating the wattage easy. Simply look on the door of your microwave or the metal collar of your lightbulbs to find their wattage.

How many watts are in a kilowatt?

Understanding how to convert watts to kilowatts is easy. There are 1,000 watts in a kilowatt. To make the conversion from watts to kilowatts yourself, simply divide the number of watts by 1,000. This will show the correct number of kilowatts

Appliance wattage chart


How to calculate my energy consumption

Thankfully, that’s exactly what our calculator above does! That said, here’s the manual calculation so you can see how the calculator works in more detail.

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


However, 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 Kilowatt-hours

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 reduce your electricity bill

According to the Energy Information Administration (EIA), most of the energy households use is consumed in a few key areas. In the average home, heating and cooling use about 32 percent of the total electricity used. Water heating isn’t far behind, accounting for 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 possibly lower your energy bill – in the most energy-consuming areas 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 and empty house.
  • Lower the temperature on your water heater to 120 degrees Fahrenheit. This will lower 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.

Shop electricity rates for your calculated energy consumption with the SaveOnEnergy marketplace

With the SaveOnEnergy marketplace, you can shop and compare between retail energy providers, plans, and rates in your area. The process is simple and quick. To begin, enter your ZIP code. From there, you will be able to explore what is currently available near you.

The SaveOnEnergy marketplace allows you to filter for specific providers, contract lengths, rate types, and features including green energy plans and free usage periods. And as a bonus, you can use our marketplace at no cost.

When you fill out the energy calculator above, we can pair your calculated electricity usage with your ZIP code to help find the best plan for you.

So, take your time, explore your options, and when you have found the right plan, we can walk you through the sign-up process in minutes.

Ready to shop for an energy plan? Let’s get you taken care of. Call:

Enter your ZIP code to get started

Are you moving to a new address?