Privacy Policy

Last updated Sep 26, 2026.

What we collect

The site has no accounts and stores no personal information you type into the calculator: calculations run on our server from the values in the address bar and are not saved. Our web server keeps standard access logs (IP address, page, time, browser) for up to 30 days for security and to enforce rate limits on the API.

Cookies, advertising and analytics

When enabled, we use Google AdSense to show ads and Google Analytics 4 to count visits. These services may set cookies and process your IP address. For visitors in the European Economic Area, the United Kingdom and Switzerland we ask for consent first and load neither service unless you accept. You can change your choice at any time by clearing this site's cookies. Learn how Google uses data at policies.google.com/technologies/partner-sites.

Your choices

You can opt out of personalised advertising at adssettings.google.com. Residents of US states with privacy laws can ask us what we hold about them (almost nothing) by emailing [email protected].

Embeds and API

The embed widget sets no cookies. API requests are logged like page requests.