GFR Calculator
Estimate kidney function (eGFR) from serum creatinine, age and sex using the 2021 CKD-EPI equation.
Runs 100% in your browser — nothing is uploaded.
Result
Formula
2021 CKD-EPI without race: 142 × min(Scr/κ,1)^α × max(Scr/κ,1)^−1.2 × 0.9938^age (×1.012 if female).
About this calculator
Educational estimate only. Kidney function should always be interpreted by a clinician.
How to use
- 1
Enter your serum creatinine in mg/dL.
- 2
Input your age and select your sex.
- 3
Click Calculate to view your eGFR and CKD stage.
Frequently asked questions
What is eGFR?
eGFR stands for estimated glomerular filtration rate. It is a calculation that estimates how well your kidneys are filtering waste products from your blood.
Why is race not included in this calculator?
The 2021 CKD-EPI equation was updated to remove race as a variable because race is a social construct, not a biological one, and including it could perpetuate health disparities.
How often should eGFR be checked?
The frequency depends on your kidney function and risk factors. Your healthcare provider will recommend a schedule based on your individual situation.
Please note: Results are estimates for general information only and are not professional or medical/financial advice.