Privacy

Last updated: October 11, 2026.

What we collect

We use Statcounter to count visits. It records standard web analytics data such as pages viewed, referring site, browser, device type and an approximate location derived from the IP address. Our web server also keeps standard access logs for security and troubleshooting.

If you send a message through the contact form, we store the name, email address and message you enter, plus your IP address to filter spam. We use them only to read and answer your message.

What we do not do

We do not sell personal data, we do not run advertising trackers, and you do not need an account to use the site. The calculator runs in your browser; the values you enter are not sent to us.

Cookies and local storage

The site stores your light or dark mode choice in your browser's local storage. Statcounter may set its own cookies to tell new visits from returning ones.

Contact

Questions about this policy can be sent through the contact page.