Privacy: What This Site Stores, and What It Does Not
This is a static site. It has no accounts, no forms, no comments and no shopping basket, so there is very little to describe.
What this site collects
Nothing. There is no analytics package on these pages, no tracking pixel, no advertising network and no third-party script of any kind. No cookie is set by this site, so there is no cookie banner to dismiss.
The calculators run entirely in your browser. Figures you type into them are used to draw the result on screen and are never transmitted anywhere or stored between visits.
What your browser sends anyway
Like any website, the server that delivers these pages receives the ordinary request information your browser sends: an IP address, the page requested, a user-agent string and a timestamp. That is a property of how the web works rather than something this site asks for, and it is not combined with anything else or used to build a profile.
When you follow a link to a bookmaker
Some links here go to gambling operators, and some of those are commercial. Following one takes you to a different company, on its own domain, under its own privacy policy and its own cookies. Once you leave this site, what happens is between you and that operator. Read their policy if it matters to you — it will be considerably longer than this one.
Changes
If this site ever starts collecting anything, this page changes first and the change will be obvious rather than buried.