Energy Calculator – kWh, Watts, Energy Costs

Energy Calculator

Are you tired of high energy bills? Do you want to save money and reduce your environmental footprint? One way to achieve this is by understanding your energy usage and finding ways to reduce it.

Our energy calculator will help you understand how much energy you’re consuming, and more importantly, how much you’re paying for it.

SlashPlan’s energy calculator lets you input data about your energy usage and calculate the cost of that usage. By understanding your energy consumption and costs, you can find ways to reduce your usage and save money on your energy bills.

The main features of the calculator include the ability to input hours used, power in watts, and current energy price.

How to Use the Energy Calculator

Using an energy usage calculator is simple. All you need to do is input the number of hours energy was used, the power used in watts, and the current energy price.

The calculator will then calculate the cost of energy consumption based on the data you provided. Make sure to input accurate data for the most precise results.

Understanding Energy Usage

Energy usage is the amount of energy consumed by a device over a certain period of time. It is usually measured in watts or kilowatt-hours. Understanding the difference between watts and kilowatt-hours is important for understanding your energy bills. Watts are the unit of power, which is the rate at which energy is consumed. Kilowatt-hours, on the other hand, are the unit of energy, which is the total amount of energy consumed over time.

Curious to learn more? Read more about Watts, Kilowatt Hours, and Amps

Some common household appliances and their energy usage include:

  • Refrigerator: 150 to 200 watts
  • Dishwasher: 1200 to 2400 watts
  • Washing machine: 500 to 1000 watts
  • Television: 80 to 400 watts
  • Light bulb: 10 to 100 watts

Understanding Energy Prices

Energy prices are calculated based on the cost of generating and delivering energy to customers, you can find your energy cost in your recent bill.

Prices can vary depending on location, provider, and time of day. To find the best energy prices in your area, you can compare prices from different providers and consider switching providers if necessary.

Benefits of Using the Energy Calculator

Using an energy usage calculator can help you save money on your energy bills in a number of ways. By understanding your energy consumption and costs, you can find ways to reduce your usage and save money.

For example, you may be able to switch to more energy-efficient appliances, adjust your energy usage habits, or invest in energy-efficient upgrades for your home. Additionally, by monitoring your energy usage over time, you can track your progress and see the impact of your efforts.

The Formula Used for Calculation

Energy Usage (kWh) = Power (Watts) x Hours Used / 1000
Energy Cost = (Power in watts / 1000) x Hours Used x Energy Price Per Kilowatt-Hour

The formula used by the energy usage calculator is simple yet effective. To calculate the cost of energy consumption, the calculator multiplies the power in watts by the number of hours used to determine the total energy consumption in watt-hours.

To convert this to kilowatt-hours (the unit used on most energy bills), the total is divided by 1000.

The resulting kilowatt-hour value is then multiplied by the current energy price per kilowatt-hour to determine the total cost of energy consumption.

By understanding this formula, you can manually calculate your energy consumption and costs without using the calculator.


Let’s say you use a 100-watt light bulb for 3 hours a day, and the current energy price is $0.15 per kilowatt-hour. The calculation would be:

Energy cost = (100 watts / 1000) x 3 hours x $0.15/kWh Energy cost = 0.3 kWh x $0.15/kWh Energy cost = $0.045

Therefore, using a 100-watt light bulb for 3 hours a day would cost approximately $0.045 per day, or $1.35 if you used that light for 3 hours every day over an entire month.

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