Biology & Medicine Tool

Creatinine Clearance

Estimate creatinine clearance with the Cockcroft–Gault equation. This page combines the live calculator with the underlying formula or method, a worked example and practical study notes.

Study Tools / Biology & Medicine / Creatinine Clearance
Clinical note: Cockcroft–Gault is an estimating equation with population and input assumptions. It should be interpreted according to the clinical or academic context in which it is being used.
Interactive calculator
Calculate Creatinine Clearance

What Is the Creatinine Clearance?

Estimate creatinine clearance with the Cockcroft–Gault equation. The calculator is paired with the governing relationship so the numerical output stays connected to the concept you are studying.

Use Creatinine Clearance to test worked problems, inspect how changing an input changes the output, and verify your own arithmetic before returning to the underlying concept.

Formula or Method

Formula / method
CrCl ≈ [(140 − age) × weight] / (72 × SCr) × sex factor

For a 40-year-old, 70 kg person with SCr=1.0 mg/dL, the unadjusted estimate is about 97.2 mL/min. Cockcroft–Gault is an estimating equation with important input and population assumptions; use the convention required by the clinical or academic context. Keep units and conventions consistent with the problem statement and with the options shown in the calculator.

How to Use the Calculator

  1. Read the input labels and enter the values requested by the problem, exercise or sequence.
  2. Check units, signs, angle mode, date convention, population/sample options or other settings before calculating.
  3. Compare the result with the displayed formula or method and the worked example below.
  4. Round only at the stage required by the question, course or reference convention.

Worked Example

Example: For a 40-year-old, 70 kg person with SCr=1.0 mg/dL, the unadjusted estimate is about 97.2 mL/min.

Common Mistakes

Why It Matters for Students

This tool is useful when a biological or physiologic relationship needs a fast numerical or sequence-based check. Keep the variables, units and assumptions visible while practising.

Cockcroft–Gault is an estimating equation with important input and population assumptions; use the convention required by the clinical or academic context. The interactive calculator is designed to make that relationship easier to verify while studying, not to replace the worked reasoning in a textbook or question stem.

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These pages are part of the same Study Tools system. For the complete collection, open the 2,420-tool NexaMed Study Tools hub.

Frequently Asked Questions

What is the creatinine clearance used for?
The Creatinine Clearance applies the relationship or method shown on this page to the inputs you provide. It is intended as a practical study and reference tool and keeps the calculation method visible beside the interactive result.
What formula or method does the creatinine clearance use?
For a 40-year-old, 70 kg person with SCr=1.0 mg/dL, the unadjusted estimate is about 97.2 mL/min.
How do I use the creatinine clearance?
Enter the requested values, check units or options, and calculate. Then compare the result with the displayed method, worked example and notes on the page. Use the same conventions required by your course, textbook or problem statement.
Calculation source: This page uses the NexaMed Prep Study Tools engine and the same tool definition used by the main interactive hub. Formula descriptions are presented for educational reference; follow the conventions, units and assumptions required by your course, textbook or examination.