Creatinine Clearance Calculator (Cockcroft-Gault)
Estimate creatinine clearance with the Cockcroft-Gault equation using actual, ideal and adjusted body weight. Example: a 60-year-old man, 80 kg, serum creatinine 1.0 mg/dL has a clearance of about 89 mL/min.
Show steps
How to use the Creatinine Clearance Calculator (Cockcroft-Gault)
- Enter the values in the fields.
- Press Calculate to see the result with the steps shown.
Formula and method
CrCl (mL/min) = (140 – age) x weight (kg) / (72 x serum creatinine in mg/dL), multiplied by 0.85 for women.
Kidney function ranges
| CrCl (mL/min) | Interpretation |
|---|---|
| 90 and above | Normal |
| 60 to 89 | Mildly reduced |
| 30 to 59 | Moderately reduced |
| 15 to 29 | Severely reduced |
| Below 15 | Kidney failure range |
Which weight to use
Actual weight works for people near ideal weight. If actual weight is more than 120 to 130% of ideal, many references use adjusted weight; for underweight patients use actual. Practice varies, so this tool shows all three.
Cockcroft-Gault versus eGFR
Cockcroft-Gault estimates a clearance in mL/min and is not indexed to body size, while CKD-EPI eGFR is indexed to 1.73 m2. Drug labels often use CrCl, and kidney staging uses eGFR.
Cautions
This calculator is for education and is not medical advice. Lab and clinical decisions belong with a qualified clinician who sees the whole picture.
Frequently asked questions
What is creatinine clearance?
The volume of blood cleared of creatinine per minute, a kidney function estimate.
What is the Cockcroft-Gault formula?
(140 – age) x weight / (72 x creatinine), times 0.85 for women.
Which weight should I use?
Often actual, ideal or adjusted depending on body size and policy.
Normal creatinine clearance?
About 90 to 120 mL/min in young adults, declining with age.
CrCl or eGFR?
Use CrCl for many drug doses and eGFR for staging chronic kidney disease.
Does it work in children?
No.
Sources
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