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Energy Calculators

What gets measured gets done. Use these handy calculators to determine the energy use of your home, to calculate the most efficient size for a window air conditioner unit, or to compare energy use between different models of appliances and vehicles. You can even find out how much your TV and computer cost you when on – and off – by the minute, day, month, and year

Time to complete: around 15 minutes

  • Fuel Economy by Vehicle

    • Find your vehicle by make, model and year, or compare different vehicles to calculate cost to drive vehicle for 25 miles, a full tank, or one year.
  • Refrigerator Energy by Model

    • Enter brand and model number of your refrigerator to determine your old model's energy consumption then compare with newer models based on your needs.
  • Washer/Dryer Energy by Model

    • Enter model, energy source, and number of loads per year to calculate life cycle costs; then compare with newer models based on your needs.

Time to complete: 30 minutes or more

  • Air Conditioner (Room/Window Unit) Sizing

    • Estimate how much cooling capacity you need based on measurements of the room, windows and doors, and number of people generally in the room.
  • ENERGY STAR Home Energy Yardstick

    • Enter your last 12 months of utility bills and the square footage of your home for an energy efficiency score of 0-10 when compared to other homes in your ZIP code.
  • Your Carbon Footprint

    • Enter estimates of annual electric, natural gas, vehicle usage and travel to calculate your personal carbon footprint.
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