Terms of Use

The calculator is free, informational

This calculator is free to use and doesn't require an account. Its results are estimates based on the information you provide, default appliance data, and a set of documented assumptions — see our methodology page. Always verify actual nameplate wattage against the manufacturer's specifications before buying or operating equipment.

Not professional advice

Nothing on this site is professional electrical advice. For permanent installations, whole-home backup systems, or anything involving your home's electrical panel, consult a licensed electrician or qualified installer. Fuel-burning generators must only be used outdoors, per the manufacturer's instructions and local safety requirements — see our Generator Safety page.

No guaranteed suitability

We do our best to recommend products that fit the needs you describe, but we can't guarantee that any specific product is suitable for your situation. Final suitability is your responsibility to confirm before purchase and use.

Affiliate links

Some links on this site are affiliate links, and we may earn a commission if you buy through them, at no extra cost to you. See our Affiliate Disclosure for details. Prices, availability, and coupon codes can change after we last verified them.

Acceptable use

Please don't attempt to disrupt, scrape at scale, or attack this site or its underlying services.

No warranties; limitation of liability

This site and its calculators are provided “as is,” without warranties of any kind. To the fullest extent permitted by law, we are not liable for damages arising from your use of this site or reliance on its results.

Changes to these terms

We may update these terms from time to time. The “last updated” date above reflects the most recent revision.

This page is general information, not legal advice, and does not claim compliance with any specific law. Questions? See our Contact page.