Privacy Policy
Last updated: June 11, 2026
Introduction
Welcome to Online Calculator24 ("we," "our," or "us"). We operate the website onlinecalculator24.com and provide free online calculator tools including scientific, mortgage, compound interest, GPA, inflation, BMI, and unit conversion calculators. This Privacy Policy explains how we handle your information when you visit our website.
No Data Collection
Online Calculator24 is designed with privacy as a core principle. All calculations are performed entirely within your browser using client-side JavaScript. We do not collect, store, transmit, or share any personal data, calculation inputs, or calculation results. No information you enter into any calculator is ever sent to our servers or any third party.
Local Storage
Your calculation history and theme preferences are stored locally on your device using your browser's localStorage feature. This data never leaves your device and is not accessible to us or any third party. You can clear this data at any time by using the "Clear Log" button in the history panel or by clearing your browser's local storage.
Cookies and Tracking
We do not use cookies, tracking pixels, analytics scripts, advertising networks, or any third-party tracking technologies. The only data stored on your device is the localStorage data described above, which is used solely for calculation history and theme preferences.
Third-Party Services
Our website loads fonts from Google Fonts (fonts.googleapis.com). Google may collect anonymized usage data when fonts are loaded. We do not integrate any other third-party services, analytics platforms, or advertising networks.
Children's Privacy
Our website is not directed at children under 13. We do not knowingly collect personal information from anyone. Since our calculators do not collect any data, there is no risk of children's data being collected.
Changes to This Policy
We may update this Privacy Policy from time to time. Any changes will be reflected on this page with an updated "Last updated" date. We encourage you to review this page periodically.
Contact Us
If you have any questions about this Privacy Policy, please visit our Contact Us page.