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Cockcroft–Gault CrCl

NephrologyGeneral Medicine

Medical context

Estimate creatinine clearance with the Cockcroft–Gault equation for drug-dosing contexts.

Nephrology and medicine teams use this when interpreting renal function, electrolytes, or fluid plans.

This page explains the CrCl formula, how to interpret the output, known limitations, and peer-reviewed references so you can verify results against primary sources and local protocols.

It is grouped under Nephrology because kidney function, electrolytes, and renal dosing helpers.

How to use this calculator

  1. Enter the values requested by the CrCl calculator using the units shown beside each field.
  2. Review the calculated result and read the interpretation section before acting on the output.
  3. Check limitations and references if the result will change management, dosing, or disposition.
  4. Use the related calculators section when you need supporting values (for example electrolytes, weight, or complementary risk scores).

Calculator

Result

73 mL/min

Cockcroft–Gault creatinine clearance

Often used for drug dosing when the label specifies CrCl. Prefer eGFR for CKD staging.

Educational use only. Confirm results with clinical judgment, primary sources, and local protocols. Not a substitute for professional medical advice. Full disclaimer.

Formula

CrCl = [(140 − age) × weight] / (72 × Scr) × (0.85 if female).

Interpretation

Used when product labeling specifies CrCl. For CKD staging, prefer CKD-EPI eGFR.

Limitations

Weight choice (ABW vs IBW vs AdjBW) changes results; follow the drug monograph.

Frequently asked questions

Which weight should I use?
Follow the specific medication’s dosing guidance — often IBW or AdjBW in obesity.
Is the CrCl result enough to make a treatment decision?
No. Calculators support medical decision-making but do not replace examination, shared decision-making, institutional protocols, or consultant input when stakes are high.
Does Calcmedical store the values I type in?
Inputs are processed in your browser for this session. We do not ask for patient names or medical record numbers. See our privacy policy for hosting and analytics details.

References

  • Cockcroft DW, Gault MH. Nephron 1976.