Privacy Policy for Our Free Online eGFR Calculator
Last updated: September 9, 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.
No Personal Health Data Collection in the Calculator
Our eGFR calculator works in your browser, so we do not ask for or store personal health details entered for kidney function estimates, including:
- 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.
Anonymous Website 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
Essential Cookies and Site Functionality
We use only limited cookies or similar technologies needed for basic website functionality and performance. These are not intended to store sensitive medical data. You can manage cookies in your browser settings, although some features may work less smoothly.
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.