Last reviewed: 27 October 2026

Privacy

This page explains, in plain terms, what happens to the information you enter on this site. The short version is: your birth date stays on your device, nothing is stored on the server from calculator use, and you do not need an account to use any tool here.

When you use a calculator on this site, the date you enter is processed in the browser only. That means the calculation happens on your own phone or computer, inside your browser, and the date is not sent anywhere as part of that calculation. The site does not keep a record of the birth dates people type in, and it does not build a list of users from calculator use.

There is no account system on this site. You do not sign up, you do not log in, and there is no profile that tracks your charts over time. If you want to keep a result, save it yourself, for example by taking a note or a screenshot on your own device. The site will not remember it for you, and that is deliberate.

The calculators on this site make no external requests. When you enter a date or a number and get a result, your browser does not send that input to another service to work it out. The maths runs locally, which is why the hand calculation methods given on the guide pages match the tool results: both follow the same stated rule.

Like most websites, this site may still receive basic technical information when you visit a page, such as the kind of information a web server normally logs to serve pages. That is different from calculator inputs, which are not sent or stored as described above. This page does not claim that visiting any website leaves no trace at all. It claims something narrower and specific: calculator inputs are processed locally and are not stored on the server.

On tracking and analytics, the honest position is this: this site’s calculators make no external requests, and the site owner may add analytics later and should update this page if so. If analytics are added in future, this page should be updated to say what tool is used, what it collects, and how to opt out, before or at the same time as the tool goes live. Until such an update appears here, you should assume no analytics statement beyond the one in this paragraph has been made.

A practical note on safety: never send sensitive personal details, such as identity numbers, passwords, or financial details, through any contact route for this site, and do not include them when describing a problem with a calculator. A birth date is enough to reproduce a chart result, and even that should only be shared if you choose to, once a contact method is listed. The contact page gives more detail on what to include and what to leave out.

If this policy changes, the updated version will appear on this page. The date of any future change should be noted here when it happens, so returning visitors can see what is different.