Privacy Policy
Last Updated: January 10, 2026
This document focuses on what data exists, where it is processed, and your choices. For rules of use, disclaimers, and permitted behavior on the site, see our Terms of Service.
1. Overview
PercentageCalculatorFree.com ("we", "us", or "our") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, and safeguard your information when you use our website and calculators.
2. Information We Do NOT Collect
Local Calculation Technology (PWA):
We utilize cutting-edge Progressive Web App (PWA) technology to ensure your absolute privacy. Unlike traditional calculators that send your data to a server for processing, our tools are 100% client-side.
This means every formula, variable, and result is calculated directly on your device (browser). We do not collect, store, or transmit any numbers or financial data you enter. Your calculation data never leaves your device, making our platform one of the most secure and private utility tools on the web.
Calculator Inputs and Results:
CalculatorEngine which runs natively in your browser's V8 engine.
3. Information We May Collect
3.1 Automatically Collected Information
When you visit our website, we may automatically collect certain technical information:
- Browser type and version
- Operating system
- IP address (anonymized)
- Pages visited
- Time and date of visit
- Referring website
This information is collected via standard web server logs and analytics tools to help us understand how our website is used and to improve our services.
3.2 Cookies
We may use cookies and similar tracking technologies for:
- Analytics: To understand how visitors use our site (e.g., Google Analytics)
- Advertising: To serve relevant ads through third-party ad networks (e.g., Google AdSense)
You can control cookies through your browser settings. Disabling cookies may affect some features of the website but will not prevent calculator functionality.
3.3 Local Browser Storage
We also use your browser's local storage (a similar on-device technology, separate from cookies) to remember convenience preferences. This information stays on your device and is not transmitted to our servers.
- Theme preference (light or dark mode)
- Cookie consent choice (whether you accepted or declined analytics cookies)
- Recently used calculators (page path and display title, up to five entries)
- Favorite calculators (pages you save with + Add to Favorites)
These items are functional convenience features only. They do not include the numbers you type into calculators or your calculation results. You can clear them at any time through your browser settings (clear site data or local storage for this domain). For technical details, see our Privacy Technology page.
4. Third-Party Services
4.1 Google Analytics
We may use Google Analytics to analyze website traffic and usage patterns. Google Analytics uses cookies to collect anonymized data. For more information, see Google's Privacy Policy.
4.2 Google AdSense
We display ads through Google AdSense, which may use cookies and web beacons to serve ads based on your browsing history. You can opt out of personalized advertising by visiting Google Ad Settings.
5. How We Use Information
We use the limited information we collect to:
- Understand how our website is used
- Improve our calculators and user experience
- Monitor website performance and security
- Comply with legal obligations
6. Data Sharing
We do not sell, trade, or otherwise transfer your personally identifiable information to third parties, except:
- To trusted third-party service providers (e.g., analytics, advertising) who assist in operating our website, subject to confidentiality agreements
- When required by law or to protect our rights
7. Data Security
We implement reasonable security measures to protect information. However, no method of transmission over the internet is 100% secure. We cannot guarantee absolute security.
Since calculator data never leaves your device, there is no risk of that data being intercepted or compromised.
8. Children's Privacy
Our website is accessible to users of all ages, including children. We do not knowingly collect personally identifiable information from children under 13. If you believe we have collected such information, please contact us immediately.
9. Your Privacy Rights
Depending on your location, you may have certain rights regarding your personal information:
- Access: Request access to information we hold about you
- Correction: Request correction of inaccurate information
- Deletion: Request deletion of your information
- Opt-out: Opt out of cookies and tracking (via browser settings)
To exercise these rights, please contact us.
10. International Users
If you are accessing our website from outside the United States, please note that your information may be transferred to and processed in the United States or other countries where our service providers operate.
11. 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. Your continued use of the website after changes constitutes acceptance of the updated policy.
12. Contact Us
If you have questions or concerns about this Privacy Policy, please contact us:
Email: [email protected]
Address: 123 Road No. 10, Bashundhara R\A, Dhaka
❓ Privacy questions
Do you store the numbers I type into calculators?
No. Calculator inputs and results are processed in your browser. We do not operate a server endpoint that receives those values for storage.
What is the difference between this policy and the Privacy Technology page?
This policy explains categories of data, cookies, analytics, and your rights. The Privacy Technology page explains how client-side execution works so you can verify it yourself.
Do you store recently used or favorite calculators?
Yes, but only on your device. Recently used and favorite calculators are saved in your browser's local storage (page path and title only). This data is not sent to our servers and does not include calculator inputs or results. You can clear it anytime via your browser settings.
Where can I read the rules for using the website?
Please read our Terms of Service for acceptable use, disclaimers, and limitations of liability.