Privacy

We keep as little as possible. There are no accounts, and what you type into a calculator stays in your browser.

Last updated 8 November 2026

[01] Calculator inputs

Calculator inputs

Numbers you type are processed in your browser. Some calculators remember your last numbers in your browser's local storage so they're there next time, and the page address can hold them so you can share a result. They aren't sent to us.

[02] Email sign-ups

Email sign-ups

If you join the email list, we store your email address, the page you signed up from and the date, only to send you updates about new tools and guides. You can unsubscribe from any email, or ask us to delete your address through the contact page.

[03] Messages

Messages

If you send a message or correction, we store what you wrote and the email you gave, to reply and fix the page.

[04] Hosting

Hosting

The site runs on Cloudflare, which processes standard request data such as IP addresses to deliver and protect the site.

[05] Analytics

Analytics

We don't use advertising trackers. If we add analytics, we'll use a cookieless setup that hides anything typed into forms, and update this page first.