Privacy Policy
Last updated 15 November 2026. This page describes what this site actually does with your data — checked against the build that is live, not a template.
Calculations happen in your browser
Every calculator on this site runs entirely in your browser. The numbers you type are never sent to a server, stored, or shared. When a calculator writes your inputs into the page address (so you can bookmark or share a result), that address stays on your device unless you choose to share the link.
No accounts, no forms that store data
There are no accounts and no sign-ups. The site has no contact form: the contact and error-report pages give you an email address, and anything you send is ordinary email handled by your provider and mine.
Hosting logs
The site is hosted on Cloudflare Pages. Like any web host, Cloudflare keeps standard server logs (pages requested, timestamps, and technical details such as browser type) for security and reliability. Those logs are the host’s, governed by Cloudflare’s own privacy policy, and I do not receive individual visitor profiles from them.
Fonts and third parties
The Inter typeface is served from this site’s own files, so loading a page makes no font requests to third parties. Pages contain links to outside sources (for example the published papers and references in the source lists); following one takes you to that site under its own policy.
Analytics and advertising
This preview build runs no analytics and shows no advertising. If analytics or advertising (such as Google AdSense) are added when the site launches, they will be disclosed here before or at the time they are switched on, including the cookies they set and how to opt out. Any advertising would be served by Google under Google’s privacy policy, and this page will name it plainly.
Changes and contact
If this policy changes, the updated text and date will appear on this page. Questions about privacy go to ianwelkins@gmail.com — see the contact page.