Privacy Policy | CalcHub

CalcHub ("we," "us," or "our") operates the website at calchub.app (the "Site"). We provide free online calculators and unit converters for math, finance, health, engineering, and other fields. This Privacy Policy explains what information we collect, how we use it, and the choices you have. By using the Site, you agree to the practices described below.

Information We Collect

CalcHub is designed to work without requiring you to create an account or log in. We do not ask for your name, email, or other personal information to use our calculators. However, we and our third-party partners may collect certain information automatically when you visit the Site:

Usage data: Pages visited, time spent, referral source, browser type, device type, and approximate geographic location (country/city level based on IP address).
Cookies and similar technologies: Small text files stored on your device to remember preferences and serve relevant content.
Calculation inputs: Any values you enter into our calculators are processed entirely in your browser and are not transmitted to or stored on our servers.

How We Use Information

We use the information collected to:

Operate, maintain, and improve the Site and our calculators.
Analyze usage trends and measure site performance through Google Analytics.
Display relevant advertising through Google AdSense.
Detect, prevent, and address technical issues or abuse.

Cookies

We use cookies and similar technologies for the following purposes:

Essential cookies: Required for basic site functionality.
Analytics cookies: Used by Google Analytics to understand how visitors interact with the Site.
Advertising cookies: Used by Google AdSense to serve ads based on your prior visits to this and other websites.

You can control or delete cookies through your browser settings. Most browsers allow you to refuse cookies or alert you when cookies are being sent. Disabling cookies may affect some site functionality.

Google AdSense & Third-Party Advertising

We use Google AdSense to display advertisements on the Site. Google, as a third-party vendor, uses cookies to serve ads based on your prior visits to our site and other sites on the internet. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visit to our site and/or other sites on the internet.

Google may use the DoubleClick cookie to serve ads based on your interests.
You may opt out of personalized advertising by visiting Google Ads Settings.
For more information about how Google uses data, visit Google's Partner Sites policy.
Third-party vendors, including Google, use cookies to serve ads based on a user's prior visits to our website or other websites.

Google Analytics

We use Google Analytics to collect and analyze usage data such as page views, session duration, and traffic sources. Google Analytics collects this information anonymously and in aggregate. It does not identify individual users. You can review Google's privacy practices at policies.google.com/privacyand opt out of Google Analytics by installing the Google Analytics Opt-out Browser Add-on.

Third-Party Links

Our Site may contain links to external websites that are not operated by us. We have no control over and are not responsible for the content or privacy practices of these third-party sites. We encourage you to review the privacy policies of any websites you visit.

Data Security

We take reasonable measures to protect the information collected. However, no method of transmission over the internet is 100% secure, and we cannot guarantee absolute security. Your calculation inputs are processed locally in your browser and are not transmitted to our servers.

Children's Privacy

Our Site is not directed to children under 13, and 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 so we can remove it.

Your Rights

Depending on your location, you may have certain rights regarding your personal information:

GDPR (European Economic Area & UK)

If you are located in the European Economic Area (EEA) or the United Kingdom, you have the right under the General Data Protection Regulation (GDPR) to:

Access: Request a copy of the personal data we hold about you.
Rectification: Request correction of inaccurate or incomplete data.
Erasure: Request deletion of your personal data ("right to be forgotten").
Restriction: Request that we limit processing of your data.
Objection: Object to processing based on legitimate interests or for direct marketing.
Data portability: Receive your data in a structured, machine-readable format.
Withdraw consent: Withdraw consent for cookie-based processing at any time.

Our lawful basis for processing is consent (for advertising and analytics cookies) and legitimate interests (for basic site operation and security). To exercise your GDPR rights, contact us at calchub.tools@gmail.com.

CCPA / CPRA (California, USA)

If you are a California resident, you have rights under the California Consumer Privacy Act (CCPA) and the California Privacy Rights Act (CPRA), including the right to:

Know: Request disclosure of the categories of personal information collected and how it is used.
Delete: Request deletion of your personal information.
Opt-out: Opt out of the "sale" or "sharing" of personal information for advertising purposes.
Non-discrimination: Receive equal service even if you exercise your privacy rights.

To exercise your CCPA/CPRA rights, email us at calchub.tools@gmail.com. You may also opt out of personalized advertising via the Google Ads Settings page or by clicking "Decline" on our cookie consent banner.

Data Retention

We do not store calculation inputs — they are processed entirely in your browser and discarded when you leave the page. Anonymous analytics data collected via Google Analytics is retained by Google according to its data retention policies (default 14 months). We do not maintain user accounts or profiles on this Site.

Cookie Consent

When you first visit CalcHub, a cookie consent banner appears asking you to accept or decline non-essential cookies (analytics and advertising). If you decline, we will not load advertising cookies or personalized ads. You may change your choice at any time by clearing your browser's local storage for this site, which will re-display the consent banner.

Changes to This Privacy Policy

We may update this Privacy Policy from time to time. We will post any changes on this page and update the "Last updated" date above. We encourage you to review this page periodically.

Contact Us

If you have questions or concerns about this Privacy Policy, please contact us at calchub.tools@gmail.com or through our contact page.