Privacy Policy
Last updated: August 2026. Your privacy is important to us — and we've designed Eleven Calculator with privacy at its core.
Privacy First: No Data Sent to Servers
All calculations on Eleven Calculator run entirely in your browser using JavaScript. Your input values (measurements, financial figures, health data) are never transmitted to our servers. They exist only in your browser's memory and disappear when you close the tab.
📋1. Information We Collect
We collect minimal information necessary to operate our website. Specifically: (a) Anonymous usage data: We use standard web analytics (such as page views, session duration, and referring sources) to understand how visitors use our site. This data is aggregated and does not identify individuals. (b) Technical data: Your browser type, operating system, and screen resolution may be logged automatically by web servers. (c) Cookies and local storage: We store your theme preference (light/dark mode) and currency selection in your browser's localStorage. This data is stored locally on your device and never sent to us.
🔍2. Information We Do NOT Collect
We do not collect, store, or process: (a) Any values you enter into calculators (health measurements, financial figures, personal data); (b) Your name, email address, or contact details (we have no sign-up or login system); (c) Payment information (all tools are completely free); (d) Location data beyond country-level from IP addresses; (e) Any sensitive personal information as defined by GDPR or applicable data protection laws.
🍪3. Cookies and Local Storage
Eleven Calculator uses localStorage (not traditional cookies) to remember your preferences: theme mode (dark/light) and currency selection. These are stored in your browser and can be cleared at any time through your browser settings. We do not use tracking cookies for advertising purposes. Analytics services we use may set their own cookies as described in their respective privacy policies.
📊4. Analytics and Third-Party Services
We may use third-party analytics services (such as Google Analytics) to collect anonymous aggregate data about site usage. These services may collect information such as page visits, time on page, and browser type. This data helps us improve the calculator tools and user experience. Google Analytics data is processed by Google Inc. under their privacy policy. You can opt out using the Google Analytics Opt-out Browser Add-on.
👶5. Children's Privacy
Eleven Calculator is a general-purpose educational tool suitable for all ages. 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 promptly delete such information from our records.
🔗6. Third-Party Links
Our website may contain links to external websites. Once you click a link to leave Eleven Calculator, we are not responsible for the privacy practices of the destination website. We encourage you to read the privacy policy of every website you visit. The inclusion of a link does not imply our endorsement of that website's privacy practices.
🌍7. International Users and GDPR
If you are accessing Eleven Calculator from the European Economic Area (EEA), you have certain rights under the General Data Protection Regulation (GDPR). Since we do not collect personal data through the calculators themselves, most GDPR provisions relating to data access, rectification, and deletion do not apply to calculator usage. For any analytics data, you may request information about what data has been collected by contacting us.
🔐8. Data Security
We implement industry-standard security measures to protect our website and any data we do process. Our website is served over HTTPS (encrypted connection). However, no method of internet transmission is 100% secure. While we strive to protect your information, we cannot guarantee absolute security against all threats.
📝9. Changes to This Privacy Policy
We may update this Privacy Policy from time to time. Any changes will be posted on this page with an updated "Last updated" date. We encourage you to review this Privacy Policy periodically. Significant changes will be highlighted prominently on our website. Your continued use of Eleven Calculator after changes constitutes acceptance of the updated policy.
📧10. Contact Us
If you have any questions, concerns, or requests regarding this Privacy Policy or our data practices, please contact us through our website at elevencalculator.com. We are committed to addressing your concerns and will respond within 5 business days.
Have more questions? View our full Terms and Conditions.