Cookie notice

Last updated: 5 October 2026

What this version uses

The calculator does not deliberately set optional cookies, use local storage, save preferences between visits or place advertising or analytics tags on your device. Calculator values are held temporarily in the current page's memory.

Cloudflare delivers and protects the site. Depending on the security features active on a particular request, Cloudflare may use strictly necessary security cookies such as cf_clearance or __cf_bm. Their purpose is security rather than advertising; details and lifetimes are described in Cloudflare's cookie documentation.

Consent controls

This build has no optional advertising or analytics storage to accept or reject, so it does not display an optional-cookie banner. We will review that position before enabling additional third-party features.

Future advertising

No Google adverts are currently loaded. If advertising or analytics is introduced, we will update this notice to describe the relevant providers, purposes and storage. Where consent is required, optional technologies will remain disabled unless you choose to allow them, with an accessible way to change that choice.

External websites

If you follow a map, source or provider link, that website may use its own cookies. We do not embed third-party maps, videos or social-media widgets in this build.

Managing your browser

You can remove or block cookies through your browser settings. Blocking strictly necessary security features may affect access to the website. Email [email protected] with questions about this notice.