Health & Fitness Calculators
GFR Calculator
Estimate kidney function (eGFR).
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Enter details
Result
Estimated GFR (CKD-EPI 2021)
92 mL/min/1.73m²
Stage G1 (normal)
About the GFR Calculator
Estimated glomerular filtration rate (eGFR) is the key measure of kidney function. Enter your sex, age, and serum creatinine and the calculator uses the race-free CKD-EPI 2021 equation to estimate your eGFR and the corresponding chronic kidney disease stage. It's the same formula labs use — a helpful reference, though only a clinician can interpret it in context.
How to use the GFR Calculator
- 1Enter your sex, age, and serum creatinine.
- 2Read the result instantly — it recalculates as you type.
- 3Adjust the numbers to model different scenarios.
Frequently asked questions
What is a normal GFR?
An eGFR of 90+ mL/min/1.73m² is normal (stage G1). Below 60 for three months suggests chronic kidney disease. Discuss results with a doctor.
Which equation is this?
The 2021 CKD-EPI creatinine equation, which removed the race coefficient. It uses creatinine, age, and sex.