🩺 Medical Tool
GFR Calculator (eGFR)
Estimate your Glomerular Filtration Rate (eGFR) using the CKD-EPI 2021 formula to evaluate how well your kidneys are filtering blood.
Kidney Function Calculator
Estimated GFR (CKD-EPI 2021)
--mL/min/1.73m²
| CKD Stage | GFR Level | Description |
|---|---|---|
| Stage 1 | 90+ | Normal or high kidney function |
| Stage 2 | 60 - 89 | Mildly decreased function |
| Stage 3a | 45 - 59 | Mild to moderately decreased |
| Stage 3b | 30 - 44 | Moderate to severely decreased |
| Stage 4 | 15 - 29 | Severely decreased function |
| Stage 5 | < 15 | Kidney failure (ESRD) |
What is GFR?
Glomerular Filtration Rate (GFR) is the best overall index of kidney function. Normal GFR varies according to age, sex, and body size, and declines with age.
This calculator uses the CKD-EPI 2021 formula, which is currently recommended by the National Kidney Foundation and American Society of Nephrology. It estimates GFR based on serum creatinine, age, and sex (it no longer includes a race multiplier).
Disclaimer: This calculator is for informational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. Always consult your doctor for interpretation of lab results.