Fatty Liver Index (FLI) Calculator
Estimate your Fatty Liver Index (FLI) score (0–100) using triglycerides, BMI, GGT, and waist circumference.
Educational use only. This tool does not diagnose disease or replace professional medical care.
What Is the FLI Calculator?
The Fatty Liver Index (FLI) is a clinical screening score that estimates the likelihood of fatty liver using routine measurements. It combines triglycerides, body mass index (BMI), GGT, and waist circumference into a single number from 0 to 100.
This fli calculator is useful if you want a quick, evidence-based estimate before discussing results with your doctor.
How the FLI Score Is Calculated
Inputs required
- Triglycerides (mg/dL or mmol/L)
- BMI (kg/m²)
- GGT (U/L)
- Waist circumference (cm)
Formula
The calculator uses the standard FLI equation:
L = 0.953 × ln(triglycerides) + 0.139 × BMI + 0.718 × ln(GGT) + 0.053 × waist − 15.745
FLI = [eL / (1 + eL)] × 100
If you enter triglycerides in mmol/L, they are converted automatically to mg/dL for the formula.
How to Interpret FLI
- FLI < 30: lower probability of fatty liver (often used to help rule out).
- FLI 30–59: intermediate zone; clinical context and follow-up matter.
- FLI ≥ 60: higher probability of fatty liver (often used to help rule in).
These cutoffs are screening guidance, not a diagnosis. Imaging, labs, and physician judgment are still essential.
Why This Matters
Fat accumulation in the liver can be silent for years. A practical screening score helps identify risk earlier, when lifestyle changes can be most effective.
- Supports conversations with your healthcare provider
- Helps track trends over time
- Encourages earlier prevention and intervention
Ways to Improve Your FLI Over Time
1) Weight and waist reduction
Even modest weight loss can improve liver fat and metabolic markers. A waistline trend downward often improves FLI inputs.
2) Improve triglycerides
Focus on lower added sugar intake, balanced carbohydrates, quality fats, and regular physical activity.
3) Support liver-friendly habits
- Limit or avoid alcohol (based on medical advice)
- Prioritize sleep and stress management
- Follow treatment plans for diabetes, lipid disorders, or hypertension
Limitations You Should Know
- FLI is a screening tool, not a diagnostic test.
- Population and individual differences can affect accuracy.
- Other liver conditions may require different workups.
- Serial trends are often more informative than one isolated value.
Final Takeaway
A reliable fli calculator can be a smart first step for understanding fatty liver risk. Use your score as a starting point for action: better habits, better follow-up, and better discussions with your clinician.