GFR Calculator (CKD-EPI 2021)
Estimated GFR Result
Understanding Your GFR Result
Glomerular Filtration Rate (GFR) is the best test to measure your level of kidney function and determine your stage of kidney disease. It calculates how much blood passes through the glomeruli (tiny filters in the kidneys) each minute.
The CKD-EPI 2021 Equation
This calculator utilizes the CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) 2021 equation. This is the current medical standard which does not include a race coefficient, providing a more equitable assessment of kidney health based on age, sex, and serum creatinine levels.
CKD Stages Table
| Stage | GFR Level | Description |
|---|---|---|
| Stage 1 | 90 or higher | Normal function (or kidney damage with normal GFR) |
| Stage 2 | 60 – 89 | Mildly decreased function |
| Stage 3a | 45 – 59 | Mild to moderate decrease |
| Stage 3b | 30 – 44 | Moderate to severe decrease |
| Stage 4 | 15 – 29 | Severely decreased function |
| Stage 5 | Less than 15 | Kidney failure (ESRD) |
Calculation Example
If a 50-year-old male has a serum creatinine of 1.2 mg/dL, his GFR would be approximately 78 mL/min/1.73 m², placing him in Stage 2 (Mildly decreased function). If a 65-year-old female has a serum creatinine of 2.0 mg/dL, her GFR would be approximately 26 mL/min/1.73 m², indicating Stage 4 (Severely decreased function).
Note: This calculator is for informational purposes only and should not replace professional medical advice. Always consult with a healthcare provider regarding kidney health and lab results.