GFR Calculator
Estimate kidney function (eGFR) using the CKD-EPI 2021 equation.
Result
Results are estimates for general information only and are not professional advice.
Estimated GFR
eGFR estimates how well your kidneys filter blood, based on serum creatinine, age and sex. This calculator uses the race-free CKD-EPI 2021 equation. Results are informational — always discuss kidney health with your doctor.
Frequently Asked Questions
What is the GFR Calculator?
Estimate kidney function (eGFR) using the CKD-EPI 2021 equation. It runs instantly in your browser and is completely free.
Is the GFR Calculator free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the GFR Calculator?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.