Privacy Policy

Last Updated: June 25, 2026

This Privacy Policy describes how Cal11 Calculator ("we," "our," or "us"), operated at https://cal11.calculator.city/, collects, uses, and shares information about you when you visit or use our website. By using Cal11 Calculator, you agree to the collection and use of information in accordance with this policy.

1. Information We Collect

1.1 Information You Provide

We do not require you to create an account or provide personal information to use our calculators. However, if you contact us via our contact form, we may collect:

• Your name
• Your email address
• The content of your message
• Any other information you choose to include

1.2 Information Collected Automatically

When you visit our website, we automatically collect certain information about your device and usage:

• Log Data: IP address, browser type and version, operating system, referring URLs, pages visited, and time/date of your visit.
• Device Information: Hardware model, operating system, browser type, and unique device identifiers.
• Usage Data: Which calculators you use, how long you spend on pages, and click patterns (aggregated and anonymized).

1.3 Calculator Inputs

All calculations performed on Cal11 Calculator happen entirely within your browser. The values you enter into our calculators are not transmitted to our servers, not stored, and not used for any purpose. Your calculation data stays on your device.

2. How We Use Your Information

We use the information we collect for the following purposes:

• Providing and improving our service: To operate, maintain, and improve the functionality of Cal11 Calculator.
• Analytics: To understand how users interact with our website and to improve user experience.
• Communications: To respond to your inquiries and provide customer support.
• Security: To detect, prevent, and address technical issues, fraud, and abuse.
• Legal compliance: To comply with applicable laws and regulations.

We do not sell your personal information to third parties. We do not use your personal information for advertising profiling.

3. Cookies and Tracking Technologies

We use cookies and similar tracking technologies to enhance your experience on our website. For detailed information about the cookies we use, please see our Cookie Policy.

Types of cookies we use:

• Essential cookies: Required for the website to function properly.
• Analytics cookies: Help us understand how visitors use our site (e.g., Google Analytics).
• Preference cookies: Remember settings like your language preference.

You can control cookie settings through your browser. Note that disabling certain cookies may affect the functionality of our website.

4. Third-Party Services

We may use the following third-party services, which have their own privacy policies:

• Google Analytics: For anonymized usage statistics. Google's privacy policy: policies.google.com/privacy
• Content Delivery Networks (CDNs): We use CDNs (such as jsDelivr) to deliver JavaScript libraries. These may log your IP address.
• Cloudflare: We may use Cloudflare for performance and security. Their privacy policy: cloudflare.com/privacypolicy

We are not responsible for the privacy practices of these third-party services.

5. Data Retention

We retain contact form submissions for up to 2 years to allow us to respond to follow-up questions and improve our service. Analytics data is retained according to the configuration of our analytics provider (typically 14 months for Google Analytics). We do not store your calculator inputs.

6. Your Rights

Depending on your location, you may have the following rights regarding your personal data:

• Access: Request a copy of the personal data we hold about you.
• Correction: Request that we correct inaccurate data.
• Deletion: Request that we delete your personal data.
• Portability: Request your data in a machine-readable format.
• Objection: Object to our processing of your personal data.
• Restriction: Request that we restrict the processing of your data.
• Withdraw Consent: Where processing is based on consent, you can withdraw consent at any time.

To exercise any of these rights, please contact us. We will respond within 30 days. If you are in the European Union, you also have the right to lodge a complaint with your local data protection authority.

7. Children's Privacy

Our services are not directed at children under 13 years of age. 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 and we will delete such information promptly.

8. Security

We implement appropriate technical and organizational security measures to protect your personal information against unauthorized access, alteration, disclosure, or destruction. However, no method of transmission over the internet or electronic storage is 100% secure. We cannot guarantee absolute security.

All data transmitted between your browser and our servers is encrypted using HTTPS/TLS.

9. International Data Transfers

Our servers may be located in the United States or other countries outside your jurisdiction. If you are located in the European Economic Area (EEA), United Kingdom, or Switzerland, your data may be transferred to countries that may not have the same level of data protection as your home country. We take steps to ensure adequate safeguards are in place for such transfers.

10. Changes to This Policy

We may update this Privacy Policy from time to time to reflect changes in our practices or applicable laws. We will post the updated policy on this page with a revised "Last Updated" date. We encourage you to review this policy periodically. Your continued use of Cal11 Calculator after the posting of changes constitutes your acceptance of such changes.

11. Contact Information

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

• Email: privacy@calculator.city
• Contact Form: cal11.calculator.city/contact

For GDPR-related requests, please include "GDPR Request" in your subject line.