FIB-4 Liver Fibrosis Calculator
The FIB-4 non-invasive liver-fibrosis index from routine bloods — a screening number, never a diagnosis.
FIB-4 uses bloods you may already have to flag who needs further liver assessment — increasingly used to triage the huge population with fatty liver (MASLD). A low score is genuinely reassuring against *advanced* fibrosis; a raised score isn't a diagnosis but a prompt for proper evaluation (often a FibroScan). It's less reliable under 35 and over 65 (hence the adjusted cut-off). Always interpreted by a clinician.
Formula
For general information only — not medical advice, a diagnosis or a treatment plan. Consult a qualified healthcare professional before making health, diet, medication or exercise decisions.
The FIB-4 non-invasive liver-fibrosis index from routine bloods — a screening number, never a diagnosis. The FIB-4 Liver Fibrosis Calculator is a free, private fib-4 calculator tool — every result computes instantly in your browser with no sign-up and no data upload.
About FIB-4 Liver Fibrosis Calculator
FIB-4 uses bloods you may already have to flag who needs further liver assessment — increasingly used to triage the huge population with fatty liver (MASLD). It applies FIB-4 = (age × AST) ÷ (platelets × √ALT). Use the FIB-4 Liver Fibrosis Calculator to get an instant, clearly-explained result with the working shown step by step — free, private and with the source method cited.
How to use FIB-4 Liver Fibrosis Calculator
- 1Enter your details in the FIB-4 Liver Fibrosis Calculator input fields above.
- 2The result updates instantly with the working and reference bands shown.
- 3Adjust any value to explore how it changes the outcome — it's free and unlimited.
Why use FIB-4 Liver Fibrosis Calculator?
- ✓Instant fib-4 calculator result that recomputes as you type — no waiting, no page reloads
- ✓100% client-side: your health data never leaves your browser
- ✓Shows the actual formula and your numbers substituted in, so you can see exactly how the result is reached
- ✓Based on published, citable sources (Sterling RK et al., Hepatology 2006 — FIB-4 index; AASLD/EASL MASLD guidance)
- ✓Free forever with no sign-up, account or app install
Frequently asked questions
How does the FIB-4 Liver Fibrosis Calculator work?+
FIB-4 uses bloods you may already have to flag who needs further liver assessment — increasingly used to triage the huge population with fatty liver (MASLD). The calculation uses the formula: FIB-4 = (age × AST) ÷ (platelets × √ALT). Everything runs instantly in your browser as you type — your inputs are never uploaded.
Is the FIB-4 Liver Fibrosis Calculator accurate, and what is it based on?+
The method is traceable to authoritative sources: Sterling RK et al., Hepatology 2006 — FIB-4 index; AASLD/EASL MASLD guidance. Results are estimates — individual variation always applies, so treat the output as a well-grounded starting point.
Is the FIB-4 Liver Fibrosis Calculator free and private?+
Yes. It's completely free with no sign-up, and all computation happens locally in your browser, so none of your health data ever leaves your device.
Can I use this for medical decisions?+
This tool is for general information only and is not medical advice. Always consult a qualified healthcare professional before making health decisions.
What can I use the FIB-4 Liver Fibrosis Calculator for?+
It's commonly used for fib-4 calculator, liver fibrosis score, fatty liver test. The FIB-4 non-invasive liver-fibrosis index from routine bloods — a screening number, never a diagnosis.
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