Last updated: September 2026.
What we collect
The calculators run entirely in your browser. The values you type are never sent to our servers or to anyone else, and they are not stored when you leave the page.
When you load a page, our hosting provider, Cloudflare, processes the standard information any web request carries (your IP address, browser type, the page requested, and the time). Cloudflare uses this to deliver the site and protect it from abuse. We see this only as aggregate traffic figures.
Cookies
This site sets no cookies of its own and uses no tracking scripts.
If we add advertising in future, the advertising provider will set cookies and may use them to show ads based on your interests. Before that happens, this policy will be updated and, where the law requires it, you will be asked for consent first.
Links to other sites
Pages may link to other websites. Their privacy practices are their own.
Children
The site is usable by students of any age. Because nothing is collected, there is nothing to collect from children either.
Your rights
If you are in the EU, UK, California or another place with data-protection rights, you can ask what we hold about you. The answer today is nothing, but you are welcome to ask through the contact page.
Changes
Changes to this policy appear on this page with a new date at the top.