Privacy policy

Last updated: November 2026. The short version: this site is built to not have your data.

What we don't collect

• No accounts, no sign-ups, no email capture anywhere on the site.
• Calculator inputs are never sent to us. Every calculation runs in your browser; recent inputs are stored only in your own browser's local storage, on your device, so the tool remembers them for you. Clearing your browser data deletes them.
• We do not sell, rent or share personal information. There is barely any to share.

What is collected automatically

Like most websites, our hosting provider (Cloudflare) processes standard request logs (IP address, browser type, pages requested) to deliver the site and prevent abuse, and we look at privacy-respecting aggregate statistics — page counts, not people. If advertising is added later, ad partners may set their own cookies under their policies; this page will be updated before that happens, and embeds served to schools will remain ad-free.

Contact

Privacy questions: [email protected].