Last updated: 2 October 2026.
Calculator data
Everything you type into a calculator is processed in your browser and is never sent to us.
Analytics and advertising
With your consent we use Google Analytics to understand how the site is used, and Google AdSense to show adverts that fund the site. Google may use cookies to show personalised ads. You can change your choices at any time with the privacy settings button shown on the page, or at Google Ad Settings. Find out how Google uses information from sites that use its services.
Your rights
Under UK GDPR you can ask for access to, correction of or deletion of any personal data we hold. Contact [email protected]. You can also complain to the Information Commissioner’s Office (ico.org.uk).