Medication dosing tool
Creatinine Clearance Calculator Using the Cockcroft-Gault Equation
Estimate creatinine clearance from age, weight, sex, and serum creatinine for situations where a medication label specifies Cockcroft-Gault CrCl.
This estimate uses the original Cockcroft-Gault equation and actual body weight. Clinicians may select a different weight method for obesity or unusual body composition.
Creatinine clearance vs eGFR
Creatinine clearance (CrCl) and eGFR are related but different estimates. CKD-EPI eGFR is commonly used to stage chronic kidney disease, while Cockcroft-Gault CrCl is still referenced by some medication labels. Do not substitute one for the other without clinical guidance.
What inputs does Cockcroft-Gault use?
The original equation uses age, body weight, serum creatinine, and a female coefficient. Weight selection can require clinical judgment in obesity or unusual body composition, so medication decisions should be reviewed by a qualified clinician or pharmacist.