Privacy

Short version: the calculations happen in your browser, and the site does not send your inputs anywhere.

What stays on your device

• Your inputs. As you use a calculator, its current values are written into the page's URL (the address bar) so you can bookmark or share a result, and into your browser's local storage so the calculator remembers your last values when you come back. A "Reset" clears both. Nothing about this leaves your browser unless you choose to share the link.
• Your preferences. Theme, accent colour, page layout, and whether the sources panel is open are kept in local storage on your device.
• Pages for offline use. The site can be installed as an app; when it is, a service worker caches pages you have visited so they open offline.

What the site sends

• Page requests and the search index, fetched from this site's own domain.
• This deployment sends pageview and basic page metadata to its configured GA4 and Umami analytics providers. Calculator inputs are not included.
• This deployment has no feedback form enabled, so no feedback is collected.
• This deployment has no embed-notification form enabled, so no email address is collected.
• Share buttons are plain links to the platform you pick. Nothing is sent to that platform until you click, and the link you share carries your calculator inputs in its address.

What the site never does

• It does not send calculator input values to analytics providers. Analytics storage or cookies are controlled by the configured providers.
• Fonts ship with the site; analytics is the only optional external measurement integration.
• It does not transmit any value you type into a calculator; every result is computed on your device.

About Calc explains who publishes the site and how to report a mistake.