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Calculator: Child Pugh score for severity of liver disease in adults (SI units)*

Calculator: Child Pugh score for severity of liver disease in adults (SI units)*


None (1 point)

Grade 1: Altered mood/confusion (2 points)

Grade 2: Inappropriate behavior, impending stupor, somnolence (2 points)

Grade 3: Markedly confused, stuporous but arousable (3 points)

Grade 4: Comatose/unresponsive (3 points)

Absent (1 point)

Slight (2 points)

Moderate (3 points)

<34.2 mcmol/L (1 point)

34.2 to 51.3 mcmol/L (2 points)

>51.3 mcmol/L (3 points)

>35 g/L (1 point)

28 to 35 g/L (2 points)

<28 g/L (3 points)
Prothrombin time prolongation

Less than 4 seconds above control/INR <1.7 (1 point)

4 to 6 seconds above control/INR 1.7 to 2.3 (2 points)

More than 6 seconds above control/INR >2.3 (3 points)

Important: Inputs must be complete to perform calculation.

Total criteria point count:


Child Pugh score interpretation

5 to 6 points: Child class A
7 to 9 points: Child class B
10 to 15 points: Child class C

  • The Child Pugh score is a modification of the Child Turcotte score. The terms Child Pugh classification and Child Turcotte Pugh classification are used interchangeably by some clinicians.
  • Please refer to appropriate UpToDate topic reviews for further information.
  • * This calculator uses SI units (Système international d'unités) as the default for inputs. Do not use this calculator if you are using conventional units (also known as US units and gravimetric units); please refer instead to the conventional units version of this calculator.

Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

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All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

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