Terms

Terms of use

Last updated 11 November 2026.

Who provides WattNumbers

WattNumbers is provided by AdModifier LLC ("we", "us"). Its pages and, once live, its calculators are free to use. By using them you agree to these terms with AdModifier LLC.

Estimates, not advice

WattNumbers results are estimates for planning and orientation. A result is only as good as the numbers you enter and the method it states. They are not energy, engineering, legal, tax or financial advice, and they do not replace an energy adviser, an engineer's or installer's calculation, or the rate notice from your grid operator or regulator. Check figures that matter before you buy, build, sign or apply for funding.

Rates and rules change

Tariffs, subsidies and building rules change. Each calculator will show the date of the rates it uses; we are not responsible for decisions based on rates that have since changed.

As it is

The site and calculators are provided as they are, without any promise that a result suits a particular purpose.

Copying

The text, examples and code of this site are ours. You may link to any page and quote short parts with a link. Please do not copy or republish whole pages, calculators or the design. Open-source parts keep their own licences (see licences).

Changes

We may update these terms; the version on this page is the current one. Questions: hello@wattnumbers.com