The converter and charts: they run entirely in your browser. Numbers you type stay on your device. We have no accounts and no database.
Cookies and analytics: we use Google Analytics 4 to count visits in aggregate. Its cookies are only set if you click Accept on the cookie banner (Google Consent Mode v2). If you click Reject, no analytics cookies are set and Google only receives anonymous, cookie-free pings. There are no ads on this site.
Settings on your device: the site remembers your cookie choice, light or dark mode and decimal places in your browser's local storage. This never leaves your device.
Contact form: if you send us a message, your name, email address and message are stored by our web host, Netlify, so we can read and reply. We use them only to answer you, and delete them once dealt with, within 12 months at most.
Your rights (UK GDPR): you can ask to see, correct or delete any message you have sent us. Use the contact form. For Google's processing of analytics cookie data, see Google's privacy documentation. You can clear cookies in your browser at any time.
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Last updated 28 September 2026. Site run by Daryn Potgieter.