CircumferencetoDiameter

Privacy Policy

Last updated: March 23, 2026

This Privacy Policy describes how CircumferencetoDiameter.net ("we," "us," or "our") collects, uses, and protects your personal information when you visit our website at circumferencetodiameter.net (the "Website"). By using the Website, you agree to the practices described in this policy.

1. Information We Collect

1.1 Information You Provide Voluntarily

We only collect personal information that you voluntarily provide to us through our contact form. This may include:

  • Your name
  • Your email address
  • The content of your message

We do not require account creation, login, or registration of any kind to use our calculator tools.

1.2 Automatically Collected Information

When you visit our Website, certain information may be collected automatically by our hosting provider (Vercel) and analytics services:

  • IP Address — collected by our hosting provider for security and performance optimization
  • Browser Type & Version — used to ensure compatibility with our tools
  • Device Type — desktop, tablet, or mobile, used for responsive design optimization
  • Pages Viewed & Time Spent — anonymous usage data to help us improve our content
  • Referring URL — where you came from before visiting our site

This data is collected in aggregate form and cannot be used to personally identify you.

1.3 Calculator Input Data

All calculations performed using our tools run entirely in your browser using client-side JavaScript. Your calculation inputs and results are never transmitted to our servers and are not stored anywhere. When you close or refresh the page, all calculation data is lost.

2. How We Use Your Information

We use the information we collect for the following purposes:

  • Responding to Inquiries — Contact form submissions are used solely to reply to your messages.
  • Improving Our Website — Anonymous analytics data helps us understand how users interact with our tools, so we can improve usability, content, and performance.
  • Security — Technical data may be used to detect and prevent abuse, spam, and unauthorized access.

We do not sell, rent, trade, or share your personal information with third parties for marketing purposes.

3. Cookies and Tracking Technologies

Our Website may use the following types of cookies:

  • Essential Cookies — Required for basic website functionality (e.g., language preferences).
  • Analytics Cookies — Used to collect anonymous usage statistics to help us improve our website. These cookies do not collect personally identifiable information.

You can control cookie settings through your browser preferences. Disabling cookies may affect certain features of the Website. For more details, see our Cookies Policy.

4. Third-Party Services

Our Website uses the following third-party services, each of which has its own privacy policy:

5. Data Retention

We retain your personal information only for as long as necessary to fulfill the purposes described in this policy:

  • Contact form data — retained until your inquiry is resolved, then deleted within 90 days.
  • Analytics data — retained in anonymized form for up to 26 months.
  • Calculator data — not retained at all; it exists only in your browser's memory.

6. Data Security

We implement industry-standard security measures to protect your information, including:

  • HTTPS encryption on all pages
  • Secure hosting on Vercel's infrastructure
  • Regular security reviews

However, no method of transmission over the Internet is 100% secure, and we cannot guarantee absolute security of your data.

7. Children's Privacy

Our Website is not directed at children under the age of 13. We do not knowingly collect personal information from children. If you are a parent or guardian and believe your child has provided us with personal data, please contact us and we will promptly delete it.

8. Your Rights

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

  • Right to Access — Request a copy of any personal data we hold about you.
  • Right to Rectification — Request correction of inaccurate personal data.
  • Right to Deletion — Request deletion of your personal data.
  • Right to Restriction — Request that we limit the processing of your personal data.
  • Right to Data Portability — Request your data in a structured, machine-readable format.
  • Right to Object — Object to the processing of your personal data.
  • Right to Withdraw Consent — Withdraw consent at any time where we rely on consent for processing.

To exercise any of these rights, please email us at contact@CircumferencetoDiameter.net. We will respond within 30 days.

For EU residents, see our GDPR Compliance page. For California residents, see our CCPA Privacy Notice.

9. International Data Transfers

Our Website is hosted on Vercel, which may store data in servers located in the United States and other countries. If you are accessing our Website from outside the United States, please be aware that your information may be transferred to, stored, and processed in the United States.

10. Changes to This Privacy Policy

We may update this Privacy Policy from time to time. Any changes will be posted on this page with an updated "Last updated" date. We encourage you to review this page periodically to stay informed about how we protect your information.

11. Contact Us

If you have any questions or concerns about this Privacy Policy, please contact us: