Privacy Policy

We believe in data minimization. We only collect the minimal information necessary to deliver, safeguard, and improve our open-access calculators:

Personal Information (only if you provide it):

• Name and email address: When you voluntarily submit an inquiry, complete our interactive contact or data request forms, or create an account (if applicable).
• Communication preferences: Your choices regarding newsletter updates or administrative replies.
• Any information you voluntarily submit: Feedback, bug reports, feature requests, or messages submitted to our privacy desk.

Non-Personal Information (automatic):

When you browse Calculator Archive, our web hosting servers automatically record standard, technical diagnostic parameters:

• Browser type, operating system, and device information (e.g., Chrome on Windows, Safari on iOS).
• IP address (anonymized): Internet Protocol addresses are masked or truncated to safeguard personal identity while enabling regional DDoS mitigation.
• Pages visited, time spent, and referral URLs: Aggregated diagnostic data on how visitors find and navigate our mathematical tools.
• General geographic location: High-level country or state-level metrics (we never request precise GPS or latitude/longitude coordinates).

Calculator Data:

We collect and process information strictly for legitimate operational purposes, including:

• Provide and maintain the Website: Ensuring continuous uptime, rapid calculation execution, and seamless algorithmic responsiveness.
• Improve user experience and calculator functionality: Identifying mobile layout defects, clarifying formula descriptions, and optimizing interactive controls.
• Respond to inquiries and provide support: Replying to user feedback, mathematical bug submissions, and data privacy requests.
• Send newsletters: Only with your prior explicit opt-in consent; every broadcast includes an immediate one-click unsubscribe mechanism.
• Analyze usage patterns (anonymized): Measuring platform bandwidth, peak traffic intervals, and tool popularity to scale server resources.
• Comply with legal obligations: Satisfying statutory requirements, auditing standards, and lawful law enforcement requests.
• Detect and prevent fraud/abuse: Mitigating automated bot scraping, malicious payloads, denial-of-service attacks, and algorithmic manipulation.

Calculator Archive uses lightweight HTTP cookies and local storage tokens to preserve your computational settings. We do not use intrusive spyware or third-party behavioral trackers.

Types of Cookies

Managing Cookies:

• Browser settings: You can configure your browser (Chrome, Firefox, Safari, Edge) to block, reject, or delete cookies at any time.
• Our cookie consent banner: Use our interactive banner or click Manage Cookie Preferences to selectively enable or disable non-essential cookies.
• Note: Disabling cookies may affect website functionality, such as resetting your preferred calculator settings (e.g. Deg/Rad or light/dark preferences) on each visit.

Do Not Track (DNT)

We honor Do Not Track (DNT) and Global Privacy Control (GPC) signals transmitted by your browser. When a DNT or GPC signal is detected, our platform automatically deactivates non-essential analytics tracking.

Your trust is our cornerstone. We uphold strict sharing limitations:

• We do NOT sell, trade, or rent personal data: We have never sold, rented, or leased personal information or calculator inputs, and we will never do so in the future.
• Service providers (hosting, analytics): Bound by written confidentiality and data processing agreements (DPAs) that restrict them from using your data for any unauthorized purpose.
• Legal requirements: When required by court orders, statutory regulations, subpoenas, or lawful law enforcement requests.
• Business transfers: In connection with or during negotiations of any merger, acquisition, divestiture, or sale of company assets, subject to standard confidentiality protections.
• With your explicit consent: When you provide direct, informed authorization for a specific disclosure.

We implement comprehensive physical, electronic, and procedural safeguards to protect your information against unauthorized access, destruction, alteration, or disclosure:

• SSL/TLS encryption: Modern HTTPS 256-bit Transport Layer Security encrypts all data transmission between your browser and our servers.
• Secure hosting infrastructure: Deployed in ISO-27001 and SOC-2 compliant enterprise data centers with multi-layer firewall defense and intrusion prevention.
• Access controls and authentication: Server access is restricted to verified systems administrators under strict least-privilege principles.
• Regular security audits: Periodic code reviews, vulnerability scans, and continuous monitoring to detect anomalies.
• Employee training: Internal protocols regarding data hygiene, privacy compliance, and incident response readiness.

Note: While we use commercially acceptable practices to protect your information, no method of transmission over the Internet or electronic storage is 100% secure. Therefore, we cannot guarantee its absolute security.

We retain personal data only for as long as necessary to fulfill the operational purposes described in this Privacy Policy, unless a longer retention period is required or permitted by law.

Depending on your jurisdiction, you possess specific statutory rights regarding your personal information:

General Rights

• Access your personal data: Request confirmation of whether we process personal data relating to you and receive a readable copy.
• Correct inaccurate data: Request the rectification of outdated, inaccurate, or incomplete information.
• Request deletion: Request the permanent erasure of your personal data (“Right to be Forgotten”).
• Restrict processing: Request that we limit the processing of your personal information under certain circumstances.
• Data portability: Receive your provided data in a structured, commonly used, and machine-readable format.
• Object to processing: Object to processing based on our legitimate interests or direct marketing.
• Withdraw consent: Withdraw previously granted consent at any time without affecting the lawfulness of prior processing.

California Residents (CCPA / CPRA)

Under the California Consumer Privacy Act (CCPA) and California Privacy Rights Act (CPRA), California residents have specific entitlements:

• Right to Know: Request disclosure of categories and specific pieces of personal data collected in the preceding 12 months.
• Right to Delete: Request deletion of personal information collected directly from you.
• Right to Opt-Out of Data Sale: We do not sell or share personal information for cross-context behavioral advertising.
• Right to Non-Discrimination: We will never deny services, charge different rates, or alter performance because you exercised statutory privacy rights.
• Contact: Submit CCPA requests to privacy@calculatorarchive.com or use our interactive Data Request Form below.

European Residents (GDPR)

If you reside within the European Economic Area (EEA), United Kingdom, or Switzerland, processing adheres to the General Data Protection Regulation (GDPR):

• Rights under Articles 15–21: Right of access, rectification, erasure, restriction, portability, and objection.
• Legal Bases for Processing:
  • Consent (Art. 6(1)(a)): When you explicitly opt into non-essential cookies or communications.
  • Contract (Art. 6(1)(b)): To provide calculator services requested directly by you.
  • Legitimate Interests (Art. 6(1)(f)): To maintain server security, prevent abuse, and optimize platform speed.
  • Legal Obligation (Art. 6(1)(c)): To satisfy statutory compliance.
• Right to lodge complaint with supervisory authority: You have the right to contact your local data protection supervisory authority.
• Contact: Contact our Data Protection Desk at privacy@calculatorarchive.com.

Other Jurisdictions

We also respect international privacy laws, including Canada's Personal Information Protection and Electronic Documents Act (PIPEDA), Australia's Privacy Act 1988, and Brazil's Lei Geral de Proteção de Dados (LGPD).

Calculator Archive is an open educational and computational resource intended for general audiences. Our platform is:

• Not directed at children under 13: We do not target, solicit, or design features to attract children under the age of 13 (or under 16 in the European Union).
• No knowing collection: We do not knowingly collect, store, or maintain personal information from children under 13.
• Parents and guardians: If you believe your child has submitted personal information through our contact forms, please contact us immediately at privacy@calculatorarchive.com and we will expeditiously remove such data from our records.
• COPPA compliant: We strictly abide by the Children's Online Privacy Protection Act (COPPA).

Our website may interact with third-party service providers:

• Links to external sites: Our informational articles or calculator documentation may reference external standards (e.g., WHO guidelines, IRS tables). We are not responsible for the privacy practices or content of external websites.
• Google Analytics: Provides aggregate visitor analytics (opt-out available via browser add-on).
• Advertising partners (if applicable): Any contextual or non-intrusive ad partners must adhere to strict data privacy standards.
• Social media features: Optional sharing buttons do not transmit behavioral data unless clicked directly by the user.

Calculator Archive is managed from the United States. If you visit from outside the United States, please note:

• Data may be transferred to US servers: Diagnostic logs and contact form transmissions may be stored and processed on secure cloud servers situated within the United States.
• Consent: By using our Website, you consent to the transfer of information to the United States.
• Adequate protection measures: We ensure standard contractual clauses (SCCs) and appropriate data safeguards protect your information across borders.

We utilize Google Analytics to understand visitor interactions on our mathematical and financial tools:

• Anonymized IP tracking: IP masking is activated so your full IP address is never stored by Google Analytics.
• Cookie-based analytics: Identifies unique returning sessions without tying data to your real-world identity.
• Opt-out: You can install the official Google Analytics Opt-out Browser Add-on to disable tracking across all websites.
• Privacy details: Review Google's privacy policy at https://policies.google.com/privacy.

We may update this Privacy Policy periodically to reflect changes in our operational practices, calculator tools, or applicable legal statutes:

• Updates posted on this page: Any revisions will be published directly on this URL.
• “Last Updated” date revised: The date at the top and bottom of this document will be updated whenever changes take effect.
• Significant changes: If material modifications occur, we will provide a prominent notice on our homepage or send email notifications to subscribed users.
• Continued use = acceptance of changes: Your continued access to Calculator Archive following the posting of updates constitutes your acknowledgment and agreement.

If you have any questions, concerns, or requests regarding this Privacy Policy or our data handling practices, our dedicated privacy team is ready to assist you: