Privacy Policy

Summary

• You do not need an account to use Calcformulas, and we never ask you to create one.
• Calculator inputs and results are processed in your browser. They are not sent to our servers.
• We do not sell your personal information, and we do not run advertising or cross-site tracking.
• We use a small amount of technical data, such as server logs, to operate and secure the site.

Information we collect

Information you provide

When you use our calculators, you may enter numbers, measurements, dates, and other values. That information is used only to perform calculations on your device. We do not receive, store, or transmit your calculator inputs or results to our servers. If you email us, we receive your email address and whatever you choose to include in your message, and we use it only to respond.

Automatically collected information

Like most websites, our hosting provider may automatically record certain technical information when you visit Calcformulas, such as your IP address, browser type, device type, operating system, referring URL, pages viewed, and the date and time of your visit. We use this information to deliver the site, monitor performance, prevent abuse, and understand general usage trends.

Local storage and preferences

We may store small amounts of data in your browser, such as your light or dark theme preference, so the site remembers your settings on future visits. This data stays on your device, and you can clear it at any time through your browser settings.

How we use information

We use the limited information described above to:

• Provide, maintain, and improve Calcformulas and its calculators
• Diagnose technical issues and protect against fraud, abuse, or security threats
• Understand aggregated traffic and usage patterns
• Respond to messages you send us
• Comply with applicable legal obligations

We do not use your calculator inputs for advertising, profiling, or building personal profiles.

Cookies and similar technologies

Calcformulas uses only the browser technologies necessary for basic site functionality, such as remembering your theme preference. We do not use cookies to collect calculator input data, and we do not set advertising or tracking cookies.

For full details on the cookies and browser storage we use, see our Cookie Policy. If we introduce optional analytics or advertising services in the future, we will update these policies and, where required by law, provide appropriate notice and consent choices first.

Third-party services

We use a small number of third-party services to operate the website. Fonts may be loaded from Google Fonts, and the site runs on hosting infrastructure that processes standard web server logs. These providers may process technical data according to their own privacy policies.

Our site may link to external websites, including the authoritative sources our formulas are based on. We are not responsible for the privacy practices of third-party sites and encourage you to review their policies before providing personal information.

Data retention

Because calculator data stays on your device, we have no calculation inputs or results to retain. Server logs and other technical records are kept only as long as needed for security, troubleshooting, and legal compliance, after which they are deleted or anonymized. Emails you send us are kept as long as needed to handle your request.

Children's privacy

Calcformulas is intended for a general audience, including students, and is designed so that no personal information is required to use it. We do not knowingly collect personal information from children under 13. If you believe a child has provided us with personal information, please contact us and we will take steps to delete it.

Your rights and choices

Depending on where you live, you may have rights to access, correct, delete, or restrict certain processing of your personal information, or to object to processing and request data portability. If you are in the EEA, the UK, or Switzerland, you may also have the right to lodge a complaint with your local data protection authority.

If you are a California resident, note that we do not sell or share personal information as those terms are defined under California privacy law.

You can also control cookies and local storage through your browser settings, use private browsing modes, and stop using the site at any time. To exercise privacy rights, contact us using the details below.

Security

We use reasonable administrative, technical, and organizational measures designed to protect information processed through Calcformulas. Keeping calculator data on your device also reduces risk: information that never reaches a server cannot be exposed from one. That said, no method of transmission over the Internet or electronic storage is completely secure, so we cannot guarantee absolute security.

Changes to this policy

We may update this Privacy Policy from time to time. When we do, we will revise the "Last updated" date at the top of this page. Continued use of Calcformulas after changes become effective means you accept the updated policy.

Contact us

If you have questions about this Privacy Policy or how we handle data, email us at support@calcformulas.com or reach us through the contact page.