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    eGFR calculator (CKD-EPI 2021)

    Calculate eGFR using the CKD-EPI 2021 equation and find the KDIGO stage of chronic kidney disease.

    years
    Sex
    Enter values — the result appears instantly.

    For information only; not a substitute for medical advice. Data is neither sent nor stored.

    Formula

    eGFR = 142 × min(Scr/κ, 1)^α × max(Scr/κ, 1)^−1.200 × 0.9938^age × 1.012 [female]; κ = 0.7 (F) / 0.9 (M), α = −0.241 (F) / −0.302 (M), Scr in mg/dL. The equation does not use race.

    Reference ranges

    • ≥ 90: G1
    • 60–89: G2
    • 45–59: G3a
    • 30–44: G3b
    • 15–29: G4
    • < 15: G5

    Frequently asked questions

    What is eGFR?
    An estimate of how much blood plasma the kidneys filter per minute, normalized to a body surface area of 1.73 m².
    Is one low value enough for a diagnosis?
    No. Chronic kidney disease is diagnosed when eGFR < 60 or signs of kidney damage persist for more than 3 months.