Privacy Policy
Last updated 2026.
The calculators
All calculators run as JavaScript inside your browser. The numbers you type are never transmitted to us and are not stored.
What we collect
Standard server and analytics logs: pages requested, approximate region from IP, browser type, referring page, timestamp. Used to see which guides are useful.
Advertising and cookies
This site is supported by display advertising. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this and other websites. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visit to this site and/or other sites on the Internet.
You may opt out of personalised advertising at Google Ads Settings, or opt out of third-party vendor cookies at aboutads.info. Visitors in the EEA, UK and Switzerland see a consent prompt before non-essential cookies are set.