# NAFLD Fibrosis Score Calculator

URL: https://speedycalculator.com/calculators/health/nafld-fibrosis-score/
Last updated: 2026-10-30

> The NAFLD fibrosis score calculator estimates the likelihood of advanced fibrosis in fatty liver disease (MASLD) from age, BMI, diabetes, AST/ALT ratio, platelets and albumin.

## Inputs

- Age (years)
- Weight (kg, lb, st, g)
- Height (cm, in, m, ft, mm)
- Impaired fasting glucose or diabetes
- AST (U/L)
- ALT (U/L)
- Platelets (×10⁹/L)
- Albumin (g/dL, g/L)

## Results

- BMI
- NAFLD fibrosis score
- Fibrosis

## Formula

```
NFS = −1.675 + 0.037 × age + 0.094 × BMI + 1.13 × (impaired fasting glucose or diabetes) + 0.99 × AST/ALT − 0.013 × platelets (×10⁹/L) − 0.66 × albumin (g/dL)
< −1.455 low (F0–F2) · −1.455 to 0.676 indeterminate · > 0.676 high (F3–F4)
```

## Explanation

Fatty liver disease affects about a quarter of adults worldwide, but only a minority develop serious scarring. The NAFLD fibrosis score uses routine data to find those who need further tests or specialist care.

### How to use the NAFLD Fibrosis Score Calculator

- **Age**
- **Weight**
- **Height**
- **Impaired fasting glucose or diabetes**
- **AST**
- **ALT**
- **Platelets**
- **Albumin**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter the patient's details and lab results.

### Inputs explained

FieldWhat to enterAgeIn yearsWeightUnits: kg, lb, st, gHeightUnits: cm, in, m, ft, mmImpaired fasting glucose or diabetesChoose one: No, YesASTIn U/LALTIn U/LPlateletsIn ×10⁹/LAlbuminUnits: g/dL, g/L

### What each result means

- **BMI** = [Weight]÷([Height]÷100)^2
- **NAFLD fibrosis score** = -1.675 + 0.037×[Age] + 0.094×[BMI] + 1.13×[Impaired fasting glucose or diabetes] + 0.99×[AST]÷[ALT] - 0.013×[Platelets] - 0.66×[Albumin]

### Example values

How the main result changes when **Age** changes and everything else stays at the example values above:

Age (years)NAFLD fibrosis score27.5-1.1241.25-0.61155-0.10268.750.40682.50.9151101.933
*Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.*

## Worked example

Inputs — Age: 55 years; Weight: 95 kg; Height: 172 cm; Impaired fasting glucose or diabetes: Yes; AST: 45 U/L; ALT: 50 U/L; Platelets: 210 ×10⁹/L; Albumin: 4.2 g/dL.

Results — BMI = 32.1; **NAFLD fibrosis score = -0.102**; Fibrosis = Indeterminate – consider elastography.

## Key terms

- **NFS**: NAFLD fibrosis score.

## FAQ

**What is MASLD?**
Metabolic dysfunction-associated steatotic liver disease, the new name for NAFLD.

**What is a good NAFLD fibrosis score?**
Below −1.455.

**How can fatty liver be reversed?**
Losing 7–10% of body weight, exercise and controlling diabetes.


## Sources

- [Angulo P et al. The NAFLD fibrosis score: a noninvasive system that identifies liver fibrosis in patients with NAFLD. Hepatology, 2007](https://pubmed.ncbi.nlm.nih.gov/17393509/)