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FIB-4 Index Calculator

Find the FIB-4 index.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator computes the FIB-4 index using FIB-4 = (Age × AST) ÷ (Platelet count × √ALT), a formula that combines a patient's age with three routine lab values — AST, ALT, and platelet count — into a single score.

Hepatologists, gastroenterologists, and primary care clinicians use it as a non-invasive first-line screen for liver fibrosis in patients with chronic hepatitis B or C, or non-alcoholic fatty liver disease (NAFLD/NASH), helping decide who needs further workup like elastography or biopsy versus who can be monitored routinely.

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