eGFR Calculator

Estimate kidney function using CKD-EPI 2021 equation. Includes CKD staging and Cockcroft-Gault creatinine clearance for drug dosing.

Patient Data

Serum Creatinine

mg/dL

Serum creatinine level from blood test. Normal: 0.7-1.3 mg/dL (male), 0.6-1.1 mg/dL (female). Higher values indicate reduced kidney function.

Age

years

Patient's age in years. eGFR naturally declines with age. The CKD-EPI formula accounts for age-related changes in kidney function.

Weight (for CrCl)

Actual body weight in kilograms. Used for Cockcroft-Gault CrCl calculation. For obese patients, some clinicians use adjusted or ideal body weight.

Note: Sex affects the formula because females typically have less muscle mass and therefore lower baseline creatinine.

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CKD-EPI 2021

— mL/min/1.73m²

Enter patient data

CKD Stage

Creatinine Clearance (CrCl)

— mL/min

Cockcroft-Gault • Use for drug dosing

CKD Staging

G3a

G3b

≥90

60-89

45-59

30-44

15-29

<15

The Formulas

CKD-EPI 2021 (eGFR)

142 × min(Cr/κ, 1)^α × max(Cr/κ, 1)^-1.200 × 0.9938^age × 1.012 (if female)

κ = 0.7 (F), 0.9 (M) | α = -0.241 (F), -0.302 (M)

Cockcroft-Gault (CrCl)

CrCl = [(140 - age) × weight] / (72 × Cr) × 0.85 (if female)

= [(140 - 45) × 70] / (72 × 1) = mL/min

Reference: Inker LA, et al. New Creatinine- and Cystatin C–Based Equations. NEJM 2021.

Frequently Asked Questions