GFR Calculator
Estimated GFR via the MDRD equation from age, sex and creatinine.
How it works
eGFR = 175 × Scr^(−1.154) × age^(−0.203) × (0.742 if female)
The MDRD equation estimates kidney function; normal is about ≥90. For screening only — see a doctor for diagnosis.
Worked example
Male, 40, serum creatinine 90 µmol/L (≈1.02 mg/dL), MDRD:
eGFR = 175 × 1.02^−1.154 × 40^−0.203 ≈ 81 mL/min/1.73m² — mildly reduced (60–89).
Notes and limitations
eGFR is an estimate; high muscle mass, recent strenuous exercise and some drugs skew creatinine. CKD-EPI is more accurate in the normal range. A single result cannot diagnose kidney disease — pair it with urinalysis and repeat testing.