Privacy Policy for Our Free Online eGFR Calculator
Last updated: October 14, 2026
Welcome to eGFR Calculator (egfrcalculator.org). This privacy policy explains how we handle information when you use our free online eGFR calculator and kidney function resources. Our goal is to keep health-related calculations private, transparent, and easy to understand.
Calculator data stays on your device
Calculator inputs are processed in your browser and are not sent to our servers for calculation. If you choose to save a result, up to 20 records, including the inputs, result and date, are stored in this browser’s local storage. Clear them through calculation history or your browser’s site-data settings. Avoid saving on a shared device.
- Serum creatinine values
- Age information
- Sex/gender data
- Calculation results
Browser-Based eGFR Calculation and Local Processing
All eGFR calculations happen locally in your web browser. Your creatinine values, age, sex, and estimated kidney function results stay on your device instead of being sent to a server for processing.
No Registration Needed to Check Kidney Function
You can use our kidney function calculator without creating an account, submitting an email address, or sharing personal medical details. The core tool is available freely and directly in the browser.
Website usage and analytics
We may use privacy-conscious analytics to understand how visitors use the website and which educational pages are most helpful. These reports are aggregated and do not include personal health information. Analytics may include:
- Page views and navigation patterns
- Browser type and device information
- Geographic region (country level)
- Referring websites
Cookies, local storage and third-party services
Local storage supports optional calculation history. Analytics and, if enabled, advertising services process information as described below; advertising vendors may use cookies and other identifiers. Browser settings can remove stored site data.
Third-party services and your choices
Analytics and server logs
We use Vercel Analytics and an Umami analytics service loaded from wang.632932.xyz to measure page use and site performance. These services may process the page URL, referrer, browser and device type, screen size, language, broad geographic region, and network information needed to deliver and secure the service. Values entered in a calculator are not included in analytics events or sent to these services.
Google advertising
If Google AdSense advertising is enabled, third-party vendors including Google may place or read cookies, or use web beacons, IP addresses, and other identifiers to serve, limit, and measure ads. Google and its partners may use advertising cookies to show ads based on visits to this and other websites. Advertising is kept separate from calculator results and educational content.
Advertising and consent choices
You can control personalized Google advertising in Google Ads Settings and opt out of some other vendors through AboutAds. Where required in the EEA, United Kingdom, and Switzerland, we will use a Google-certified consent management platform before requesting personalized ads and provide a way to change or withdraw consent.
Privacy questions
For a privacy question or correction request, email contact@egfrcalculator.org. Do not include laboratory results or other sensitive medical information.