Privacy Policy

Last updated: 22 October 2026.

The calculators

All calculations run in your own browser. The numbers you type into a calculator are not sent to us or stored by us.

Analytics

When analytics are enabled, we use them to understand which pages are useful (for example page views and approximate country). We do not sell personal data.

Advertising and cookies

When advertising is enabled on this site, 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 based on your visits. You can opt out of personalised advertising at Google Ads Settings, and manage cookies in your browser settings. Pages will be updated here before ads go live.

Your choices

You can block or delete cookies in your browser at any time; the calculators will keep working. Questions about this policy: see the contact page.