Privacy Policy

1. Information We Collect

1.1 Calculator Inputs (Client-Side Only)

All calculator inputs and results are processed entirely in your browser (client-side JavaScript). We do not collect, store, or transmit:

• The values you enter into calculators
• Your calculation results
• Any numerical or personal data from calculator usage

Your calculator data stays on your device and is never sent to our servers.

1.2 Analytics (If Enabled)

We may use privacy-focused analytics to understand how visitors use our website. This includes:

• Pages visited and time spent on pages
• Referral sources (how you found our site)
• General location (country/region level only, no precise geolocation)
• Device type and browser information

We use analytics to improve the website experience, not to track individual users. If we use analytics, we anonymize IP addresses and do not collect personally identifiable information.

1.3 Cookies

We use minimal cookies only for essential functionality:

• Essential cookies: Required for the website to function properly
• Analytics cookies: Only if you consent, to understand site usage

We do not use advertising cookies, tracking pixels, or third-party marketing cookies.

2. How We Use Information

The limited information we collect is used exclusively for:

• Operating and maintaining the website
• Understanding how visitors use the site to improve educational content
• Monitoring website performance and fixing technical issues
• Complying with legal obligations

We do NOT use your information for:

• Advertising or marketing
• Selling or sharing data with third parties
• Tracking you across other websites
• Building user profiles

3. Data Sharing & Third Parties

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

We may share information only in these limited circumstances:

• Service Providers: We may use third-party services for hosting and analytics. These providers are contractually obligated to protect your data and cannot use it for other purposes.
• Legal Requirements: We may disclose information if required by law, court order, or government request.
• Safety & Protection: We may disclose information to protect the rights, property, or safety of our users or others.

4. Your Rights

Under GDPR (European users) and CCPA (California users), you have the following rights:

GDPR Rights (EU Users)

• Right to Access: Request a copy of your personal data
• Right to Rectification: Correct inaccurate personal data
• Right to Erasure: Request deletion of your personal data
• Right to Restrict Processing: Limit how we use your data
• Right to Data Portability: Receive your data in a portable format
• Right to Object: Object to processing of your personal data
• Right to Withdraw Consent: Withdraw consent at any time

CCPA Rights (California Users)

• Right to Know: What personal information we collect and how it's used
• Right to Delete: Request deletion of your personal information
• Right to Opt-Out: Opt-out of the sale of personal information (we don't sell data)
• Right to Non-Discrimination: Not be discriminated against for exercising your rights

To exercise these rights, please contact us. We will respond within the legally required timeframe.

5. Data Retention

We retain information only for as long as necessary:

• Analytics data: Aggregated and anonymized, retained for up to 26 months
• Server logs: Retained for up to 30 days for security and troubleshooting
• Calculator data: Never stored on our servers (client-side only)

6. Security

We implement appropriate technical and organizational measures to protect your information:

• HTTPS encryption for all connections
• Secure hosting infrastructure
• Regular security updates and patches
• Limited access to any collected data
• No storage of sensitive personal information

However, no method of transmission over the internet is 100% secure. We cannot guarantee absolute security.

7. Children's Privacy

This website is intended for users 18 years of age and older. We do not knowingly collect personal information from children under 18.

If you believe we have collected information from a child under 18, please contact us immediately and we will delete it.

8. International Users

This website is operated from the United States. If you're accessing from outside the US, please be aware that your information may be transferred to, stored, and processed in the United States where our servers are located.

By using this website, you consent to the transfer of your information to the United States.

9. Do Not Track

We respect Do Not Track (DNT) signals. If your browser sends a DNT signal, we will honor it by not tracking your browsing behavior.

10. Changes to This Privacy Policy

We may update this privacy policy from time to time. Changes will be effective immediately upon posting to this page.

We will update the "Last Updated" date at the top of this page. We encourage you to review this policy periodically.