Privacy Policy

1. Introduction

Health Calculator Online ("we," "our," or "us") is committed to protecting your privacy. This Privacy Policy explains our practices regarding the collection, use, and disclosure of information when you use our website at healthcalculatoronline.com (the "Service").

By using our Service, you agree to the terms of this Privacy Policy. If you do not agree with our policies and practices, please do not use our Service.

2. Information We Do NOT Collect

All calculator computations are performed locally in your web browser using JavaScript. No data is transmitted to our servers for processing. Note that advertising partners may set cookies as described in Section 4 — this never includes anything you type into a calculator.

3. Information We May Collect

3.1 Server Logs

Our hosting provider (Cloudflare Pages) may log minimal technical information for security and reliability, such as IP address, user agent, and requested URLs. We do not combine these logs with your calculator inputs.

3.2 Contact Information

If you email us, we receive your email address and the content of your message. We use this information only to respond to your inquiry and do not add it to any marketing list.

3.3 Calculator Ratings

If you rate a calculator (1–5 stars), we store the rating together with a salted, one-way hash of your IP address and browser user agent. This hash is used only to prevent duplicate votes and cannot be reversed to identify you. No raw IP addresses are stored with ratings.

4. Cookies, Advertising and Similar Technologies

4.1 First-Party Cookies

We do not set our own tracking cookies and we do not store calculator inputs in cookies or local storage. Your calculator inputs never leave your device.

4.2 Third-Party Advertising Cookies (Google AdSense)

We display advertising served by Google AdSense to keep our calculators free. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this website or other websites. Google's use of advertising cookies (such as the DoubleClick cookie) enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the internet.

You can opt out of personalized advertising:

• Google Ads Settings: adssettings.google.com — opt out of personalized ads from Google
• Digital Advertising Alliance: aboutads.info/choices — opt out of some third-party vendors' use of cookies for personalized advertising
• European users: youronlinechoices.com — manage advertising preferences for EU/EEA ad vendors

For more information on how Google uses data when you use our site, see How Google uses information from sites or apps that use our services.

5. Data Security

We implement appropriate technical and organizational measures to protect any information we may collect:

• SSL/TLS encryption for all data transmission
• Regular security audits and updates
• Secure hosting infrastructure

6. Third-Party Services

We rely on third‑party infrastructure to deliver the site:

• Hosting & CDN: Cloudflare Pages and its CDN to serve static files quickly and securely
• Advertising: Google AdSense serves the ads on this site and may use cookies and similar technologies as described in Section 4
• Consent management: Google's certified consent management platform (Funding Choices) collects and stores your advertising consent choices in the EEA, UK, and Switzerland

These providers may maintain technical logs for security and performance. See their privacy notices for details: Cloudflare, Google.

7. International Users and Advertising Consent (EEA, UK & Switzerland)

Our Service is accessible globally. If you are accessing our Service from the European Economic Area, the United Kingdom, or Switzerland, the following applies:

• Consent message: On your first visit you are shown a consent message (Google's certified consent management platform, operating under the IAB Transparency & Consent Framework). Personalized advertising cookies are set only if you consent.
• If you decline: You can still use every calculator. Google may serve non-personalized ads, which use cookies only for frequency capping, fraud prevention, and aggregate reporting.
• Withdrawing consent: You can review or withdraw your consent at any time via the "Privacy & Cookie Settings" link in the footer of every page.
• Legal bases: We rely on your consent (Art. 6(1)(a) GDPR) for personalized advertising and on legitimate interest (Art. 6(1)(f) GDPR) for security, fraud prevention, and basic site delivery.
• We don't collect personal health information — all calculations run locally in your browser
• You have the right to access, correct, or request deletion of any personal data we may hold, and to lodge a complaint with your local supervisory authority

8. Children's Privacy

Our Service is not directed to children under 13. We do not knowingly collect personal information from children under 13. If you are a parent or guardian and believe your child has provided us with personal information, please contact us.

9. Your Rights

Depending on your location, you may have certain rights regarding your information:

• Right to access any personal information we may have
• Right to correction of inaccurate information
• Right to deletion of your information

10. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page and updating the "Last Updated" date. Your continued use of the Service after any changes indicates your acceptance of the updated Privacy Policy.

11. Contact Us

If you have any questions about this Privacy Policy or our privacy practices, please contact us: