ZovaTool

GFR Calculator

GFR (CKD-EPI 2021)
97.6 mL/min/1.73m²
G1 — Normal
MDRD
82.8
mL/min/1.73m²
Cockcroft-Gault
104.2
mL/min
Reference: KDIGO CKD stages
G1 ≥90 normal · G2 60–89 mild · G3a 45–59 · G3b 30–44 · G4 15–29 · G5 <15
⚠ Educational use only — clinical decisions require a doctor.

How to use the GFR Calculator

  1. Enter serum creatinine in mg/dL (µmol/L × 0.0113).
  2. Enter age, sex, weight and (for children) height.
  3. Read GFR via CKD-EPI 2021 plus MDRD, Cockcroft-Gault and Schwartz.
  4. Check the KDIGO CKD stage.
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GFR: the single best kidney function number

CKD-EPI 2021 is the current gold standard. It dropped the race coefficient and is used for staging chronic kidney disease worldwide.

MDRD is older but still seen in lab reports. Cockcroft-Gault gives creatinine clearance, preferred for drug dosing.

Schwartz is the paediatric formula using height and creatinine. ⚠ This tool is educational — always confirm with your clinician.