GFR CalculatorFree online fitness & health calculator — instant results, no sign-up

eGFR = 142 × min(Scr / κ, 1)^α × max(Scr / κ, 1)^(-1.2) × 0.9938^Age × (1.012 if Female, else 1)

• eGFREstimated glomerular filtration rate in mL/min/1.73m²
• ScrSerum creatinine concentration in mg/dL
• κSex-specific constant: 0.7 for females, 0.9 for males
• αSex-specific exponent: -0.241 for females, -0.302 for males
• AgeAge of the individual in years

The tool computes the ratio of serum creatinine to the sex-specific baseline κ, raises the bounded ratios (minimum and maximum against 1) to their respective power terms, and scales the result by age and female sex factors. The final eGFR is rounded to the nearest whole integer and mapped to standard kidney function stages ranging from G1 Normal down to G5 Failure.

These are the calculator's starting values and the results it actually produces for them.

1. 1Determine κ (0.7 for female, 0.9 for male) and α (-0.241 for female, -0.302 for male).
2. 2Calculate the standardized creatinine ratio s = Scr / κ.
3. 3Evaluate 142 × min(s, 1)^α × max(s, 1)^(-1.2) × 0.9938^Age × (1.012 if female, 1 if male).
4. 4Round the result to the nearest integer and assign the kidney disease stage (G1 if ≥ 90, G2 if ≥ 60, G3a if ≥ 45, G3b if ≥ 30, G4 if ≥ 15, or G5 if < 15).