Calculator inputs
With JavaScript enabled, calculations run in your browser. The calculator scripts do not upload your inputs or results to a calculation service, save them in browser storage, or create an account. Reloading a tool restores its illustrative example.
Do not enter personal or confidential information in source-reference notes. JavaScript is required for interactive calculations. If a browser submits a form without JavaScript, entered values can become part of the requested URL; use the readable formulas and worked examples instead.
Page requests and fonts
The server delivering a page receives ordinary request information, such as the requested URL, IP address and browser headers. The hosting service may retain technical logs according to its own settings.
Pages load fonts from Google Fonts. Your browser requests font styles and files from Google, which receives connection information needed to serve them. These font requests do not include values typed into a calculator.
Cookies, analytics and advertising
The current site does not include an analytics tracker, advertising script, account system or application cookie. Future integrations would require an updated notice; planned advertising is not an active service.
External links
Source links take you to other websites. Their privacy practices apply after you follow a link. Calculator inputs are not added to those links.