Privacy policy
Updated: September 21, 2026
Controller and contact
Main-Mietservice, Hajo-Rüter-Straße 14, 65239 Hochheim, Germany. Contact print.design2212@gmail.com with questions about the processing of your data.
Calculator inputs and local storage
Calculations run in your browser. Inputs are saved in this browser’s localStorage, separately for each calculator and selected region. They remain until overwritten or website data is cleared. Region and cookie choices are also stored locally. Anyone with access to the same browser profile on a shared device may see saved values. Calculations still work when browser storage is unavailable.
Shared results
Clicking “Copy result link” creates a link containing your current inputs and region. Values are encoded, not encrypted, in the fragment after the # character. Browsers do not send this fragment in a normal web-page request. Anyone receiving the link can read the values, including participant names in group calculators. Only share information the recipient may see. Legacy ?s= links still work; their query parameters may appear in hosting logs when opened. After reading a result link, the page removes its result code from the address bar. This does not revoke copies of a link already shared.
Website operation and hosting
Vercel hosts the website and processes connection data needed to deliver and secure it, such as IP address, request time, browser information and the requested URL. This is separate from optional analytics. Fonts are served as website files, so your browser does not need to connect to Google Fonts.
Optional usage analytics
Google Analytics loads only after you actively agree. We measure page views and calculator actions: starting an input, viewing a result after changing an input, sharing a link, resetting or encountering invalid inputs. Our event parameters include calculator name, language, region and a general error category, not entered amounts or names. Page and referrer URLs sent by our tracking code omit query strings and fragments. Google also processes technical device and usage information. Processing in the United States is possible. This website does not activate advertising features or Google Signals.
Consent and withdrawal
Optional analytics relies on your consent (Article 6(1)(a) GDPR and Section 25(1) TDDDG). Reject or withdraw it at any time through “Cookie settings”; calculators remain usable. Withdrawal disables further analytics calls and deletes accessible analytics cookies. It does not retroactively erase information already sent.
Retention and deletion
Local calculator inputs, region and consent choices remain until website data is cleared. “Reset” replaces the current calculator’s inputs with its example values. Analytics cookies are configured with a 13-month lifetime and may be deleted earlier in your browser. Log and analytics data held by service providers follow the retention settings of those services. Contact us at the address above for details or a deletion request.
Your rights
Subject to applicable legal conditions, you have rights including access, correction, erasure, restriction and portability. You may object to processing based on legitimate interests and withdraw consent for future processing. You may complain to a data protection authority, such as the Hessian Commissioner for Data Protection and Freedom of Information.