U.S. Department of Energy - Energy Efficiency and Renewable Energy

Consumer's Guide – Energy Calculators and Software

Homes

Here you'll find calculators to help you evaluate your home's energy use and need for energy-efficient improvements.

Saving Energy

• Energy Efficient Rehab Advisor

  This tool provides guidelines and savings information for incorporating energy efficiency into renovation projects for single and multifamily housing. From the U.S. Department of Housing and Urban Development

• Home Energy Saver

  Identify the best ways to save energy in your home. From the Lawrence Berkeley National Laboratory

Insulation

• Zip Code Insulation Tool

  Provides the most economic insulation level for new or existing houses. From the Oak Ridge National Laboratory

Appliance Cost Calculators

• ENERGY STAR® Cost Calculators

  Find product information and savings calculators for a wide array of ENERGY STAR products.

• Refrigerator Retirement Savings Calculator

  Calculates potential savings from replacing an old refrigerator with a new ENERGY STAR refrigerator. From ENERGY STAR

Water Saving Technologies Cost Calculators

Find the lifetime energy savings of water saving technologies with varying efficiencies. From the U.S. Department of Energy

• Faucets/Showerheads

• Toilets/Urinals

• WaterWiser Drip Calculator

  Measure and estimate the water wasted due to leaks. From the American Water Works Association

Software

• Building Energy Software Tools Directory

  Features a list of software tools developed primarily for the buildings industry. From the U.S. Department of Energy

Other Resources

More calculators to help you evaluate renewable energy systems, space heating and cooling systems, and water heaters.

• Renewable Energy Systems
• Space Heating and Cooling
• Water Heating

Also, see our information about home energy audits and analyzing your electricity loads.