America's leading solar calculator

How it works: We display an online estimate based on your power usage and on previous installations in your zip code. We then seek live pricing from installers for this system. Live pricing data is an installers most commercially sensitive information and so this is why we are required to validate your name, address and phone number. If we can't validate this information your estimate will only include historical pricing.


Developed with support from:

US Department of Energy

US Department of Energy


What are my solar savings?



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This Solar Calculator will compute the size and estimated cost to install a solar energy system for your home or building. The solar calculator's financial analysis is based on energy bill savings you can expect and the net solar system cost, after tax credits and other incentives are applied. The solar calculator results are based on many assumptions and the limited data you will enter.

This estimate will tell you:

  • The size of system you need
  • The roof space you need
  • The incentives and tax credits you get
  • A ballpark cost based on industry averages
  • Pricing from local installers (if available)

You will get an instant ballpark estimate, a detailed estimate by email, and be contacted by one or more local installers who will verify the details of your estimate.

Developed with support from:

US Department of Energy

US Department of Energy