1. Overview
Hydration Calculator provides free, evidence-based fluid intake calculators, hydration scales, and educational guides. We believe personal health tools should respect your privacy. This policy outlines what information we collect, how it is used, and your rights when visiting our website.
2. Zero Collection of Personal Health Data
All calculators across our platform—including our Daily Hydration Calculator, Sweat Rate Calculator, Dehydration Calculator, and all specialized tools—run entirely on your device using client-side JavaScript.
We do not collect, store, transmit, or share:
- Personal biometric figures such as body weight, height, age, or biological sex.
- Workout durations, sweat loss measurements, or urine color selections.
- Pregnancy or breastfeeding status entered into family calculators.
- Any diagnostic or personal health inputs.
Your numbers remain exclusively in your browser session and are cleared when you refresh or close your browser tab.
3. Cookies and Local Storage
We use minimal browser cookies and local storage strictly to ensure site stability and remember user preferences:
- Unit Preferences: Remembers your chosen measurement standard (metric kilograms and liters vs. imperial pounds and fluid ounces).
- Language Settings: Saves your preferred language when browsing localized versions of our website.
- Consent State: Records whether you have accepted our cookie notice so the banner does not reappear on every visit.
For a complete technical list of all keys and storage durations, please see our dedicated Cookies Policy.
4. Google AdSense and Third-Party Advertising
We may display advertisements served by Google AdSense and trusted third-party advertising partners to help fund our free tools and research guides.
- Google, as a third-party vendor, uses cookies to serve ads on this website.
- Google’s use of advertising cookies enables it and its partners to serve ads based on your visit to this site and other websites on the Internet.
- Users may opt out of personalized advertising by visiting Google Ads Settings.
- Alternatively, you can opt out of third-party vendor cookies for personalized advertising through the Digital Advertising Alliance consumer choice page.
5. Server Logs and Technical Information
Like virtually all web services, our hosting servers automatically record standard HTTP request logs. These logs may include your IP address, browser type, operating system, referring page, and timestamps.
This technical data is processed strictly for server security, defense against distributed denial-of-service (DDoS) attacks, and uptime monitoring. Server logs are not combined with any personal profiles.
6. Third-Party Links and Scientific Sources
Our educational guides reference public health institutions such as the National Academy of Medicine (NAM), the European Food Safety Authority (EFSA), and the American College of Sports Medicine (ACSM). When you follow an external link, the privacy policies of those destination websites govern their data practices.
7. Data Rights and Regulatory Compliance
We operate in compliance with the General Data Protection Regulation (GDPR), the California Consumer Privacy Act (CCPA/CPRA), and related privacy frameworks:
- No Data Sales: We do not sell, rent, or monetize personal user information.
- No User Accounts: Because our site requires no account registration, we do not store customer profiles or identity dossiers.
- Browser Controls: You can clear your cookies and local storage at any time via your browser settings without losing calculator functionality.
8. Contact Us
If you have questions about this Privacy Policy or our data practices, please reach out via our Contact Page.