Privacy policy

The figures you type into the calculator are processed on your own device — they are not sent to us and we do not store them. For general usage statistics the site loads Google Analytics 4, but consent for storage is denied by default for every visitor, wherever they are: no analytics cookie is set, and Google writes no identifier to your device and reads none from it. That is also why there is no consent banner — there is nothing to grant and nothing to withdraw. A cookieless ping still goes to Google on every page view, carrying the page address and your IP address, from which an approximate location is derived; an IP address is personal data, so we do not call this measurement anonymous. There are no advertising cookies, no ads, and we sell no data. There is one exception, named here rather than passed over in silence: the gr_int flag, our own exclusion for internal visits. It is written only if you deliberately open a page with ?internal=1 appended — as a cookie with a lifetime of one year, and additionally in local storage — and the measurement code reads it on every page view. On an ordinary visit nothing is written. It holds a single flag and nothing about you, and you delete it by clearing this site’s data in your browser.