What data we collect, how we use it, and your choices.
What's My Deficit? is a free, client-side calorie calculator. We take your privacy seriously. The health and body data you enter into the calculator (weight, height, age, goal weight) is never transmitted to any server — all calculations happen entirely within your browser and are discarded when you close or refresh the page.
We do not collect or store any personal health data you enter into the calculator. The only data collected is standard, anonymized analytics data through Google Analytics, which includes:
This information is collected in aggregate and cannot be used to identify you personally. We use it solely to understand how the tool is being used so we can improve it.
This site uses Google Analytics 4 (GA4), a web analytics service provided by Google LLC. Google Analytics uses cookies and similar tracking technologies to collect and analyze information about site usage.
Google may use this data in accordance with its own privacy policy. You can learn more about how Google collects and processes data at policies.google.com/privacy.
You can opt out of Google Analytics tracking by installing the Google Analytics Opt-out Browser Add-on, or by enabling "Do Not Track" in your browser settings. Most modern ad blockers also block Google Analytics by default.
This site does not set any first-party cookies. Google Analytics may set cookies in your browser for session tracking purposes. These are third-party cookies governed by Google's cookie policy.
No cookies are used for advertising, retargeting, or tracking you across other websites.
The data you enter into the calculator — including age, sex, weight, height, and goal weight — exists only in your browser's memory for the duration of your session. It is never sent to a server, never stored in a database, and never shared with any third party.
Refreshing or closing the page clears all entered values completely.
This site loads resources from the following third-party services:
No other third-party scripts, trackers, or analytics services are loaded.
If we make material changes to this privacy policy, we will update the effective date at the top of this page. We encourage you to review this page periodically. Continued use of the site after changes constitutes acceptance of the updated policy.