What this site stores

• No cookies. None — so there is no cookie banner.
• No account, no personal data. You never log in or tell us who you are.
• Your unit preference (km or miles) is kept in your own browser's local storage. It never leaves your device.
• Your current calculation is encoded in the page URL so you can bookmark or share it. It's only ever in your URL bar — we don't receive it.

Not medical or coaching advice

Training paces and race predictions here are model estimates (the Jack Daniels VDOT method) for healthy, trained runners. They are not medical advice; consult a professional before major changes to your training.

Who runs this site

RunZones is operated by krisoft.sk. For any question, including privacy, contact us through that website.