1. Overview
FastingCalc ("we", "our", or "us") operates the website myfastingcalc.com. This Privacy Policy explains what data we collect, how we use it, and your rights regarding that data.
Core principle: Your fasting calculations run entirely in your browser. No health data, fasting times, or personal information you enter into our calculators is ever transmitted to or stored on our servers.
2. Data We Collect
a) Calculator Data (Not Collected)
All calculator inputs — including your fasting start time, weight, height, age, and goal — are processed exclusively in your browser using client-side JavaScript. This data is never sent to any server and is not retained after you close or refresh the page.
b) Analytics Data (Google Analytics 4)
We use Google Analytics 4 (measurement ID: G-FSNGSG4799) to collect anonymous usage data including:
- Pages visited and time spent on each page
- Approximate geographic location (country/city level only)
- Browser type, operating system, and screen size
- Referring website or search engine
- Events such as button clicks and calculator interactions
This data is anonymised and aggregated. Google Analytics does not collect your name, email address, or any personally identifiable information through our implementation. Google's privacy policy governs data collected by Google Analytics: policies.google.com/privacy.
c) Advertising Data (Google AdSense)
We display advertisements provided by Google AdSense(publisher ID: ca-pub-2876447698247675). Google AdSense uses cookies and similar tracking technologies to serve ads that are relevant to your interests based on your browsing history across the web.
Specifically, Google AdSense may:
- Use cookies to track your browsing behaviour across websites
- Use DoubleClick cookies to measure ad performance
- Collect data about your device and browser for ad targeting
- Serve personalised advertisements based on your interests
You can opt out of personalised advertising at: google.com/settings/ads. You can also opt out via the NAI opt-out page.
For more information about how Google uses data when you use our site, see How Google uses data from sites that use Google's services.
You can opt out of Google Analytics data collection via the Google Analytics Opt-out Browser Add-on.
3. Cookies
We use the following categories of cookies:
| Cookie Type | Provider | Purpose | Can Opt Out? |
|---|---|---|---|
| Essential | FastingCalc | Cookie consent preference storage | No (required) |
| Analytics | Google Analytics 4 | Anonymous usage statistics | Yes |
| Advertising | Google AdSense | Ad personalisation and measurement | Yes |
| Advertising | DoubleClick (Google) | Ad conversion tracking | Yes |
You can control cookies through your browser settings. Disabling cookies may affect the functionality of third-party services (Google Analytics, AdSense) but will not affect the core calculator functionality of this site.
4. Your Rights (GDPR / CCPA)
Depending on your location, you may have the following rights:
- Right to access — Request a copy of data we hold about you
- Right to erasure — Request deletion of your personal data
- Right to opt out — Opt out of data collection for advertising purposes
- Right to portability — Receive your data in a portable format
- Right to object — Object to processing of your data for certain purposes
As we do not collect personal health data, most data rights apply to analytics data held by Google. To exercise your rights regarding Google's data, contact Google directly or use the Google Data & Privacy dashboard.
To exercise any rights related to our site specifically, contact us at: hello@myfastingcalc.com
5. Data Retention
- Calculator data: Never stored — exists only in your browser session
- Google Analytics data: Retained for 14 months by Google (default GA4 setting)
- AdSense cookies: Governed by Google's retention policies (typically up to 13 months)
- Cookie consent preference: Stored in your browser's localStorage for 365 days
6. Third-Party Links
Our blog articles contain links to external websites (PubMed, Mayo Clinic, NIH, and others) for scientific citations. FastingCalc is not responsible for the privacy practices of these external sites. We recommend reviewing their privacy policies before interacting with their content.
7. Children's Privacy
FastingCalc is not directed at children under the age of 13. We do not knowingly collect personal information from children under 13. Intermittent fasting is not recommended for minors — see our Medical Disclaimer.
8. Changes to This Policy
We may update this Privacy Policy from time to time. The "Last updated" date at the top of this page reflects the most recent revision. Continued use of FastingCalc after changes constitutes acceptance of the updated policy.
9. Contact Us
For any privacy-related questions or to exercise your data rights, contact us at: