Creatinine Clearance Calculator
Educational CrCl sketch — not a lab result or a dosing order. Click any i for detail.
Patient sketch
Age (years)
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Age
Age in years. |
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Sex
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Sex
Cockcroft–Gault multiplies by 0.85 for female. |
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Weight unit
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Unit
Pounds or kilograms. |
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Weight
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Weight
Actual body weight in this sketch. Many drug protocols use IBW or adjusted weight instead — this page does not switch automatically. |
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Serum creatinine (mg/dL)
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SCr
Lab creatinine in mg/dL. |
How to use this calculator
- Enter age, sex, and weight.
- Enter SCr in mg/dL.
- Read mL/min.
- Do not dose from this page — confirm with the lab, the protocol, and a clinician.
Results explained
CrCl ≈ ((140 − age) × kg × [0.85 if female]) / (72 × SCr). CKD-EPI eGFR is indexed to 1.73 m² and is not the same number.
Quick reference: CrCl vs eGFR
Pharmacokinetics often still talks in Cockcroft–Gault mL/min.
| Item | Detail |
|---|---|
| Cockcroft–Gault | This page |
| CKD-EPI 2021 | eGFR calculator |
| Weight | Protocols may want IBW |
| Units | SCr as mg/dL |
SI creatinine (μmol/L) is not auto-converted.
How the estimate is built
((140−age) × kg × sex factor) / (72 × SCr).
Example scenario
55-year-old male, 180 lb, SCr 1.1 — read mL/min on the result.
FAQ
Why not eGFR?
Different equation, different units/indexing. Use the eGFR page for CKD-EPI.
Obese dosing?
Many protocols adjust weight — not automatic here.
Is this a diagnosis?
No.