Privacy Policy

This Privacy Policy explains how DiagonalCalculator.com (“we”, “us”, “our”) handles information when you use our website and geometry calculators (the “Service”).

Privacy by design (how the calculator works)

Our diagonal calculator is designed to run in your browser. Your rectangle inputs (such as side lengths, area, perimeter, units, and angle choices) are processed on the client side to produce real-time results. We do not require accounts to use the Service.

What we collect

• Server logs: standard logs (IP address, user-agent, timestamps, request paths) used for security, abuse prevention, and reliability.
• Usage/analytics data (if enabled): aggregated metrics like page views, broad device category, and approximate region. This helps us improve speed, layout, and usability.
• Messages you send: if you contact us via the contact page, we receive the information you submit.

What we do not collect by default

• No user accounts, passwords, or login profiles are required.
• No payment information (we do not process payments on the calculator pages).
• No government ID numbers.
• We do not intentionally collect the exact rectangle values you type into the calculator as personal data (inputs are meant to stay in-browser).

Cookies & similar technologies

We may use cookies or similar technologies for essential site functionality and, if enabled, basic analytics. If any non-essential cookies are introduced, we will provide notice and controls where required by law.

How we use information

• Operate, maintain, and improve the Service (performance, UX, bug fixes)
• Secure the site, prevent abuse, and troubleshoot issues
• Respond to inquiries you send us
• Measure broad trends (e.g., which pages are helpful) without trying to identify you

Legal bases (EEA/UK)

• Legitimate interests for security, basic analytics, and service improvement
• Consent where required (e.g., optional analytics cookies, if offered)

Sharing

We do not sell your personal information. We may share limited information with trusted service providers that help us run the Service (e.g., hosting, CDN, security, analytics), subject to confidentiality and data-protection obligations. We may disclose information if required by law or to protect the rights, safety, and integrity of the Service.

Data retention

We retain server logs and analytics for a limited period consistent with security and operational needs. Contact messages are kept as long as needed to respond and maintain records. We aim to keep retention minimal.

Security

We use reasonable administrative, technical, and organizational measures to protect information. No internet service is 100% secure, but we work to reduce risk through best practices.

Your choices & rights

• You can use the calculator without creating an account.
• You may be able to control cookies through your browser settings. If we use cookie controls, you can opt out of non-essential cookies there.
• If you’re in the EEA/UK, you may have rights to access, correct, delete, or restrict processing of your personal data.
• California residents may have rights under the CCPA/CPRA. You can reach out to make a request.
• To exercise rights or ask questions, contact us via the contact page.

Children

The Service is not directed to children under 13 (or the age required by local law). If you believe a child provided personal information, please contact us so we can delete it.

Changes

We may update this Privacy Policy from time to time. If changes are material, we’ll take reasonable steps to notify you (e.g., a notice on the site). The “Last updated” date reflects the latest revision.

Contact

Questions about privacy? Reach out via the contact page.

Last updated: November 28, 2025