GFR Calculator

Estimate Glomerular Filtration Rate (eGFR) using CKD-EPI (2021) and MDRD equations for kidney staging.

GFR Calculator Options
Result Details
Enter parameters and click Calculate to view.
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Clinical Tool

GFR Calculator

Analyze Glomerular Filtration Rate estimates.

100% Free & Local
STEP 01

Input Demographics

Enter the patient's age in years and select their biological gender (Male/Female).

STEP 02

Serum Creatinine

Provide the current serum creatinine concentration value in standard mg/dL.

STEP 03

Staging Analysis

The calculator processes mathematical factors according to the CKD-EPI (2021) and MDRD equations.

STEP 04

Get Diagnostics

View the calculated glomerular filtration rates and the matching kidney staging classification.

Your Privacy Matters

All calculations run locally in your browser.

No Server Uploads

No variables or results are sent to our servers.

Auto-Cleared

Your session data is erased upon closing the tab.

Capabilities

Key Capabilities

Complete Features

CKD-EPI Compliance

Applies the modern CKD-EPI (2021) equation standard, which removes race indicators for diagnostic equity.

Dual Equation Output

Computes both CKD-EPI and legacy MDRD indicators side-by-side to crosscheck renal trends.

Kidney Stage Mapping

Automatically categorizes kidney health levels from Stage 1 (normal) to Stage 5 (kidney failure).

Input Unit Standard

Accepts serum creatinine values in standard mg/dL or other concentration averages.

Local Secure Processing

Patient lab metrics stay fully client-side. No medical information is recorded on our servers.

Help

Common Questions Answered

Support
Q1 What is eGFR?
Estimated Glomerular Filtration Rate (eGFR) measures how well your kidneys filter waste by assessing blood creatinine levels, age, and gender parameters.
Q2 Why was the race variable removed from CKD-EPI in 2021?
The National Kidney Foundation and the American Society of Nephrology recommended removing the black race modifier to improve diagnostic equity and accuracy.
Q3 What does a GFR score below 60 indicate?
A GFR value below 60 mL/min/1.73m² for 3 months or longer indicates Chronic Kidney Disease (CKD) and requires clinical oversight.
Q4 Can this GFR tool evaluate acute kidney injury?
No. GFR equations assume a stable creatinine level. During acute kidney issues, creatinine changes too rapidly for these formulas to be reliable.
Q5 Is eGFR the same as creatinine clearance?
No. eGFR normalizes kidney function relative to body surface area (1.73m²), while Creatinine Clearance (CrCl) measures absolute volume clearance, typically used for drug dosing.