This page describes the current HowWatt version. Updated October 6, 2026.
Calculator inputs
Calculations run in your browser. Values entered in calculators are not sent to our server and are not retained after reloading the page.
Cookies and analytics
This version’s code does not set cookies or use localStorage, Google Analytics or advertising scripts. If analytics or advertisements are added, we will update this page and configure the required consent controls.
Hosting and external links
The hosting provider may process technical request logs, including IP address, page URL and request time, to operate and protect the website. External sites linked from HowWatt have their own data handling policies.
Methodology updated October 6, 2026