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Clinical — Renal Function
Creatinine Clearance Calculator
Estimate creatinine clearance (CrCl) with the Cockcroft-Gault equation — enter age, sex, weight and serum creatinine to get an mL/min value for dosing reference.
Sex
Creatinine clearance
—
Cockcroft-Gault estimate.
| Interpretation rough CrCl range | — |
|---|---|
| Weight used in kilograms | — |
Show our math
Enter your figures above to see the step-by-step working.
For clinical reference and education — not a substitute for professional judgmentEverything computed client-side — nothing leaves this page
How the Creatinine Clearance Calculator Works
The Cockcroft-Gault equation estimates the kidneys’ creatinine clearance (CrCl) from a patient’s age, sex, body weight and serum creatinine. It is widely used to guide renal dosing of medications. Enter the four values and the calculator returns an estimate in millilitres per minute.
Because it uses actual body weight, the estimate can run high in obesity and low in patients with little muscle mass, so some clinicians substitute ideal or adjusted body weight. Always interpret the number alongside the clinical picture and the specific drug label.
CrCl = (140 − age) × weight (kg) × (0.85 if female) ÷ (72 × serum creatinine)
Frequently Asked Questions
What is the Cockcroft-Gault equation?
It estimates creatinine clearance from age, sex, body weight and serum creatinine: (140 minus age) times weight in kg, times 0.85 for women, divided by 72 times serum creatinine.
Which weight should I use?
Actual body weight is standard, though some clinicians use ideal or adjusted body weight in obesity. Use the weight your institution specifies.
How is CrCl used for drug dosing?
Many medications are renally cleared and are dose-adjusted by creatinine clearance. Always follow the specific drug label and clinical guidance.
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