Privacy Policy

What the calculators do with your inputs

Every calculator on this site computes in your own browser, in the page itself. The numbers you type — height, weight, ability, the lot — are never transmitted anywhere, never stored in a database, and never written to a cookie or log by the site. Close the tab and they are gone. Refresh the page and the form returns to its defaults, because nothing was saved to restore.

Hosting

The site is served by Cloudflare Pages. Like every web host, Cloudflare processes basic technical request data (such as IP addresses and browser information) to deliver pages and protect the service from abuse, under its own privacy policy. The site itself sets no tracking cookies.

Analytics

When this site is running on its own domain, it uses Google Analytics 4 (GA4), loaded through Cloudflare Zaraz (Cloudflare's tag manager), to understand which tools and pages are useful. GA4 records page views and usage events (for example, "a calculator was used"), along with device and browser type, approximate location at city or country level, and the referring page. GA4 uses first-party cookies (_ga and related identifiers) to distinguish visits; this data is sent to Google. It does not receive anything you type into the calculators. Google's own handling of this data is described in Google's Privacy Policy.

The site also uses Ahrefs Web Analytics, loaded through Cloudflare Zaraz, which records page views, referrers, and rough device and browser information. It is cookieless: it sets no cookies and does not identify individual visitors across sites. Ahrefs' handling of this data is described in Ahrefs' privacy policy.

Analytics events never include your height, weight, ability level, or any other values you enter — only that a tool was used. No names, emails, addresses, or precise locations are collected by either service on this site's behalf.

You can opt out of Google Analytics with Google's official opt-out browser add-on, or block both services with any standard ad-blocking or tracking-protection browser extension — every part of this site works fully without them.

Cookies

The site itself sets no cookies. The analytics services named above may set their own when they are active; your browser settings can block or clear them at any time, and blocking them does not affect any calculator — the tools do not depend on cookies to work.

Advertising

When advertising is enabled on this site, Google AdSense may set advertising cookies and use web beacons to serve and measure ads, including personalised ads where you have consented to them. You can control personalised advertising in your Google account's ad settings, and opt out of third-party vendor cookies via your browser. Until advertising is enabled, no advertising cookies are set by this site.

The error-report form

The report-an-error form does not submit anything itself: it composes an email in your own email app, from your own address, only when you press send. Nothing is collected in the background. If you email a report, your message (including your email address) is kept only as long as needed to handle the correction, and is never used for marketing.

Your rights

The site holds almost no personal data by design — calculator inputs never reach it. For anything you have sent by email, you may ask what is held, ask for it to be corrected, or ask for it to be deleted, by writing to the data controller: Ian Welkins, at ianwelkins@gmail.com. Requests are answered within 30 days. You also have the right to complain to your local data-protection authority.

Changes to this policy

If this policy changes, the new version will be published on this page before the change takes effect, and material changes will be described in plain language here — never slipped in silently. The calculators' in-browser design is a commitment, not a feature: they will not start sending your inputs anywhere without this page saying so first, prominently.