Terms of use

Use the calculators freely. They produce planning estimates from published chart data, and you accept that they are exactly that.

No warranty, no design

GenSize provides sizing estimates for information and budgeting. It is not engineering advice, not an electrical design, and not a substitute for a licensed electrician's load calculation or a manufacturer's installation manual. Wattages are typical figures; appliances vary; nameplates govern. We stand behind the arithmetic and make no promises about your specific equipment.

Safety responsibilities are yours

Generators produce lethal carbon monoxide and their connection to building wiring is regulated work. Nothing here authorizes panel work, and no estimate on this site makes backfeeding, indoor operation, or unpermitted wiring acceptable. Follow the manual, the code, and the CO alarm.

The usual paragraph

Content is provided as-is without warranties of any kind; to the maximum extent permitted by law we're not liable for damages arising from use of this site. Links to other sites don't imply endorsement. These terms can change with the site; the effective date below tracks the current revision. If a piece of this page is unenforceable where you live, the rest still applies.

Effective 2026-07-15. Questions: contact.