Terms and privacy
A general estimate, not medical advice
By using this site, you understand that its result is an educational planning estimate for healthy adults and is not a diagnosis, treatment, or individualized medical recommendation.
Use of the calculator
Water needs vary and the estimate may be too high or too low for you. Do not use it to override professional advice, a prescribed fluid restriction, or symptoms requiring medical attention. Avoid drinking large quantities in a short period.
Privacy
The calculation runs locally in your browser and does not require an account. We do not intentionally collect the weight, activity, or condition selections entered into the calculator. A hosting provider may process ordinary technical request logs needed to deliver and secure the site.
External sources
Links to research and third-party websites are provided for context. Their content and availability are controlled by their respective publishers.
Changes
The model and these terms may change as the tool improves or evidence evolves. Continued use of the site means you accept the current version.
Last updated: August 17, 2026