Privacy policy

Last updated: 2026.

Calculator entries

The dates and options you enter are worked out on your own device. They are not sent to us or stored on our server. If you use the Share button, the dates are placed in the page link so that whoever opens the link sees the same result.

Feedback and email

If you send feedback or email us, we receive your message and email address, and use them only to reply and to improve the site.

Hosting and logs

The site is hosted on Cloudflare, which may process technical data such as your IP address and browser type to deliver the pages and protect against abuse.

Analytics

We may use Google Analytics to count visits and see which pages are useful. It uses cookies and collects data such as pages viewed, device type and approximate location. You can opt out with Google’s browser add-on.

Advertising

We may show ads from Google AdSense. Google and its partners use cookies to serve ads based on your visits to this and other websites. You can turn off personalised ads in Google’s Ads Settings (adssettings.google.com) or at www.aboutads.info. Visitors in the EEA and UK will be asked for consent where required.

Children

The site is meant for a general audience and does not knowingly collect personal information from children under 13.

Contact

Questions about privacy: [email protected].

Updated November 2026 · How we calculate