About

Free calculators to size a home solar system with official data for your state: how many panels you need, system size and yearly production.

How we work

• Official data: every calculator is built on public data from the agency or laboratory that publishes it, and each page links to its source.
• Dated values: prices, production estimates and other values are stored with the date they apply, so results change when the data changes.
• Tested before publishing: each calculator is checked against independently calculated cases, including edge cases.
• Visible reviews: each page shows when it was last reviewed and its change log.

Who is behind it

HomeSolarMath is an independent site run by Luis Alberto Magaña Mora. It is not affiliated with any government agency, utility or company mentioned on the site.

Results are estimates: for your specific case, ask a qualified professional. If you find an error, let us know.