Privacy Policy

Last updated: March 21, 2026

Calculator data

All calculations on NumberCalcs run entirely in your web browser. The numbers you enter into our calculators are never sent to our servers or any third party. Your data stays on your device.

Analytics

We use the following analytics services to understand how visitors use the site:

• Google Analytics 4 — collects anonymous usage data such as page views, device type, and approximate location. Google Privacy Policy
• Microsoft Clarity — records anonymized session replays and heatmaps to help us improve user experience. Clarity does not collect personal data. Microsoft Privacy Statement

Cookies

Your theme and language preferences are stored in your browser's localStorage (not cookies). Cookies are set only by our analytics providers (Google Analytics, Microsoft Clarity).

Advertising

We do not currently serve advertising; if that changes we will update this policy and our cookie disclosures.

Third-party links

Our site may contain links to external websites. We are not responsible for the privacy practices of those sites.

Changes

We may update this privacy policy from time to time. Changes will be posted on this page with an updated date.

Contact

Questions about this policy? Open an issue on our GitHub repository.