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eGFR Calculator (CKD-EPI)
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years
eGFR (2021 CKD-EPI, race-free)
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About
The estimated glomerular filtration rate (eGFR) is used to assess kidney function. The CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) equation is the most widely recommended formula. In 2021, the CKD-EPI equation was updated to remove the race variable, providing a single equation for all patients. The 2009 version with race adjustment is provided for reference only.
Formula
2021 CKD-EPI (race-free):
eGFR = 142 × min(SCr/κ, 1)^α × max(SCr/κ, 1)^(−1.200) × 0.9938^Age × (1.012 if female)
κ = 0.7 (female), 0.9 (male)
α = −0.241 (female), −0.302 (male)
Interpretation
| GFR Stage | eGFR (mL/min/1.73m²) | Description |
|---|---|---|
| G1 | ≥ 90 | Normal or high |
| G2 | 60 – 89 | Mildly decreased |
| G3a | 45 – 59 | Mildly to moderately decreased |
| G3b | 30 – 44 | Moderately to severely decreased |
| G4 | 15 – 29 | Severely decreased |
| G5 | < 15 | Kidney failure |
References
- Inker LA, et al. New Creatinine- and Cystatin C-Based Equations to Estimate GFR without Race. N Engl J Med. 2021;385(19):1737-1749.
- Levey AS, et al. A new equation to estimate glomerular filtration rate. Ann Intern Med. 2009;150(9):604-612.
- KDIGO 2012 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease.
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Disclaimer
For educational and informational purposes only. Not intended to replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional.