Use this free online GFR calculator to estimate your kidney function (eGFR) with the 2021 race-free CKD-EPI creatinine equation, based on your serum creatinine level, age, and gender. This estimate is for general informational purposes only and is not a substitute for professional medical advice — always consult a doctor for a full kidney health assessment.
This is a simplified estimate for educational purposes only and is NOT a substitute for professional medical diagnosis. Kidney function assessment requires a doctor's evaluation of your full clinical picture. Consult a healthcare professional.
How to Use the GFR Calculator
Enter your Serum Creatinine level in mg/dL in the "Serum Creatinine (mg/dL)" field.
Enter your Age in years.
Select your Gender from the dropdown.
Click "Calculate eGFR" to view your estimated GFR value and CKD stage.
Frequently Asked Questions
This calculator uses the 2021 race-free CKD-EPI creatinine equation, which combines your serum creatinine, age, and gender (using gender-specific kappa and alpha constants) to estimate your glomerular filtration rate (eGFR) in mL/min/1.73m².
The calculator classifies your eGFR result into CKD stages: G1 (90+, normal), G2 (60-89, mildly decreased), G3a (45-59, moderately decreased), G3b (30-44, moderately to severely decreased), G4 (15-29, severely decreased), and G5 (below 15, kidney failure).
If you leave the serum creatinine or age fields blank, or enter a zero or negative value for either, the calculator shows an error message asking for valid values instead of a result.
No. This eGFR calculator provides a simplified estimate for general educational purposes only. It is not a substitute for professional medical diagnosis — consult a doctor for a full assessment of your kidney health.