Creatinine Clearance Calculator (Cockcroft-Gault)
Cockcroft-Gault Equation
Formula
CrCl = [(140 - age) x weight] / (72 x SCr) | x 0.85 if female
Frequently Asked Questions
What is the Cockcroft-Gault formula?
CrCl = [(140 - age) x weight (kg)] / [72 x serum creatinine (mg/dL)]. Multiply by 0.85 for females. It estimates creatinine clearance for drug dosing.
When is Cockcroft-Gault used instead of eGFR?
Cockcroft-Gault is preferred for drug dosing adjustments because most drug studies used this formula. eGFR (CKD-EPI) is preferred for CKD staging.
Should I use actual or ideal body weight?
The original formula uses actual body weight. For obese patients (BMI > 30), many pharmacists use adjusted body weight: IBW + 0.4 x (actual - IBW).
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