Creatinine Clearance Calculator (Cockcroft-Gault)
Estimate creatinine clearance with the Cockcroft-Gault equation.
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How to do it
- 1Step 1: Open Creatinine Clearance Calculator (Cockcroft-Gault) and add your input
Type your numbers or text, add your file, or pick the options you need. Nothing is uploaded: everything stays in your browser.
- 2Step 2: What Creatinine Clearance Calculator (Cockcroft-Gault) does
Estimate creatinine clearance with the Cockcroft-Gault equation.
- 3Step 3: Read the result and compare
The result appears at once. Change one value to see how the answer moves, then keep the figure that fits your case.
- 4Step 4: Copy or save it
Copy the result or download it. For an important decision, confirm it with the official source or an adviser.
About this tool
Enter age, weight, serum creatinine and sex. The calculator estimates the creatinine clearance in mL/min and places it in a kidney function range.
Formula
CrCl = (140 − age) × weight in kg ÷ (72 × serum creatinine in mg/dL), multiplied by 0.85 for women.
Use
Cockcroft-Gault is widely used to adjust drug doses. For obese or very thin patients the choice of weight (actual, ideal or adjusted) changes the result, and the equation is not suited to rapidly changing kidney function.
Ranges
Above 90 mL/min normal, 60 to 89 mildly decreased, 30 to 59 moderately decreased, 15 to 29 severely decreased and below 15 kidney failure range.
For information only. It does not replace a clinician's judgement or local protocols.
Worked example
A 60-year-old man of 75 kg with a creatinine of 1.1 mg/dL has a clearance of about 76 mL/min.
Tips for best results
Check every box before you rely on a result, because one wrong digit changes the whole answer. Use the exact figures from your payslip, bill, certificate or contract, and keep a note of the date you calculated. Rates, thresholds and rules change from time to time, so for tax, fees and legal matters treat the output as an estimate and confirm with the official source named on this page. You can run as many scenarios as you like; nothing is saved or sent, and refreshing the page clears the boxes.
Quick facts
- Category: UK & US
- Works in your browser, no sign-up, no upload.
- Your input stays on your device.
- Available in English.
- Content last reviewed:
Frequently asked questions
Which weight should I use?
Actual body weight in most adults; clinicians may use ideal or adjusted weight for very high or low body weights.
Is it the same as eGFR?
No. eGFR uses other equations and is normalized to body surface area.
Units of creatinine?
mg/dL. Divide µmol/L by 88.4 to convert.
What about children?
Use a paediatric equation.