eGFR Calculator
Calculate estimated glomerular filtration rate (eGFR) using the CKD-EPI 2021 equation. Used to stage chronic kidney disease from serum creatinine, age, and sex.
eGFR (mL/min/1.73 m²)
88.9
CKD stage
G2 (mildly reduced)
Educational tool. Not a substitute for clinical judgment, professional diagnosis, or treatment. Always verify with current guidelines.
How to use the egfr calculator
Enter serum creatinine (mg/dL), age (years), and sex. The CKD-EPI 2021 race-free formula returns eGFR in mL/min/1.73 m².
Formula & explanation
CKD-EPI 2021: 142 × min(Scr/κ, 1)^α × max(Scr/κ, 1)^−1.200 × 0.9938^age × (1.012 if female). κ = 0.7 (female) or 0.9 (male); α = −0.241 / −0.302.
Examples
Scr 1.0, age 55, male → eGFR ≈ 87 mL/min/1.73 m² (G2).
Frequently asked questions
- Why race-free?
- The 2021 update by NKF/ASN removed the race coefficient to address health-equity concerns.
- Children?
- Use the bedside Schwartz formula for pediatric patients, not CKD-EPI.
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