A general estimate, not medical advice

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 and analytics

The calculation runs locally in your browser and does not require an account. We do not send the weight, activity, condition selections, or calculated result to our analytics service. A hosting provider may process ordinary technical request logs needed to deliver and secure the site.

Google Analytics 4 loads by default when you visit this site. We use it to understand aggregate page visits and whether people start or complete the calculator. Google Analytics may use analytics cookies and process information such as page URLs, interaction events, browser or device details, and analytics identifiers.

Google processes analytics data under its Privacy Policy. You can limit analytics cookies or requests through your browser settings or a content blocker.

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.