Creatinine Clearance Calculator (Cockcroft-Gault)
Estimate creatinine clearance / GFR with the Cockcroft-Gault equation from age, weight and serum creatinine. Education/reference only.
For Reference & Education Only. Not for Real-world Clinical Use.
This calculator is a study and teaching aid. Do NOTuse it to make real patient care, dosing or treatment decisions. Always confirm every value against a licensed clinician, your institution's approved protocols, the drug label and a validated clinical reference. No warranty of accuracy is given, and no liability is accepted for any use.
CrCl = ((140 − age) × weight kg) ÷ (72 × serum creatinine) × 0.85 if female. Uses actual body weight; adjust per clinical guidance.
What Is the Creatinine Clearance Calculator (Cockcroft-Gault)?
The Creatinine Clearance Calculator estimates kidney function (CrCl, an estimate of GFR) using the Cockcroft-Gault equation from age, weight, serum creatinine and sex. It's commonly referenced for renal drug dosing. This is a reference and education tool only and must not be used for real-world clinical decisions — always confirm with a licensed clinician, the drug label and your institution's approved protocols.
How It Works
Enter age, weight, serum creatinine and tick Female if applicable; the estimated creatinine clearance appears instantly.
When to Use It
As a study/reference aid for the Cockcroft-Gault equation. Not for real renal dosing — always confirm with a clinician and validated tools.
Frequently Asked Questions
- What's the equation?
- CrCl = ((140 − age) × weight kg) ÷ (72 × serum creatinine mg/dL), × 0.85 for females. It uses actual body weight by default.
- Is this clinically valid?
- It reproduces a well-known formula for education, but it isn't a substitute for clinical judgment or validated calculators. Do not use for real dosing.
Last reviewed: 2026-06-27