What is the Fatty Liver Severity Calculator?

The Fatty Liver Severity Calculator computes the Hepatic Steatosis Index (HSI)—a validated non-invasive blood test formula that estimates the likelihood and severity of hepatic steatosis (fatty liver) in NAFLD/MASLD. It combines ALT, AST, BMI, sex, and type 2 diabetes status per Lee et al. Digestive and Liver Disease (2010). HSI screens for fat accumulation in the liver—not fibrosis (scarring).

How is the Hepatic Steatosis Index (HSI) calculated?

HSI = 8 × (ALT/AST ratio) + BMI + 2 (if female) + 2 (if type 2 diabetes). BMI = weight (kg) ÷ height (m)². Example: female, BMI 32, ALT 50, AST 30, diabetes yes → ALT/AST = 1.667 → HSI = 8 × 1.667 + 32 + 2 + 2 = 13.34 + 36 = 49.34 (likely significant steatosis).

What HSI cutoffs indicate fatty liver?

Per Lee et al. 2010: HSI 36 rules in NAFLD with ~92.4% specificity (positive likelihood ratio ~6.069); scores between 30 and 36 are indeterminate and require liver ultrasound or further evaluation.

What does a low HSI mean?

A low HSI (below 30) suggests hepatic steatosis is unlikely. Most patients in this range have minimal or no liver fat (S0). Continue lifestyle maintenance—Mediterranean diet, exercise, weight management—and routine liver enzyme monitoring. A low HSI does not exclude early metabolic changes or future steatosis if risk factors worsen.

What does an indeterminate HSI mean?

An indeterminate HSI (30 to 36) cannot reliably exclude or confirm steatosis. Request abdominal ultrasound, FibroScan CAP, or specialist assessment. Do not assume a healthy liver—early mild steatosis (S1) may be present. Intensify lifestyle intervention and screen for fibrosis with FIB-4 or NAFLD Fibrosis Score.

What does a high HSI mean?

A high HSI (above 36) indicates a high probability of hepatic steatosis. Scores 36–40 suggest likely mild steatosis; 40–45 moderate burden; above 45 more extensive steatosis. Steatosis is usually reversible with 7–10% weight loss, but fibrosis screening (FIB-4, NFS) is essential because steatosis severity does not predict fibrosis stage.

What labs do I need for the HSI calculator?

You need ALT and AST from a liver function panel, plus height and weight for BMI. Sex and type 2 diabetes status are clinical inputs. Fasting is not required for HSI itself. Use values from the same blood draw when possible for accurate interpretation.

How is HSI different from FIB-4 or NAFLD Fibrosis Score?

HSI screens for steatosis (fat in the liver). FIB-4 and NAFLD Fibrosis Score (NFS) screen for advanced fibrosis (scarring, F3–F4). A patient can have high HSI (significant steatosis) with low FIB-4 (no advanced fibrosis), or vice versa. Use HSI first for steatosis burden, then FIB-4/NFS for fibrosis staging.

How is HSI different from the Fatty Liver Risk Calculator?

Our Fatty Liver Risk Calculator uses lifestyle and metabolic factors (waist, diet, alcohol, activity) to estimate future NAFLD risk without blood tests. The Fatty Liver Severity Calculator uses actual ALT, AST, and BMI from labs to quantify current steatosis probability via HSI. Use risk screening first; use HSI when you have liver enzyme results.

What is the significance of ALT/AST ratio in HSI?

In NAFLD/MASLD, ALT typically rises more than AST, producing an ALT/AST ratio > 1.0. This ratio is multiplied by 8 in the HSI formula—the highest-weighted enzymatic component. Ratio < 1.0 may suggest alcohol-related liver disease, muscle injury, or fibrosis (AST predominance). Interpret alongside clinical history.

Why does female sex add 2 points to HSI?

The Lee et al. logistic regression model found female sex to be an independent predictor of NAFLD in the derivation cohort—particularly in Asian populations where women may develop steatosis at lower BMI. The +2 adjustment is part of the validated formula, not a clinical judgment.

Why does diabetes add 2 points to HSI?

Type 2 diabetes reflects insulin resistance—the core metabolic driver of hepatic de novo lipogenesis and triglyceride accumulation. The +2 diabetes adjustment captures this independent risk in the Lee formula. Prediabetes is not included in the original HSI—select No unless you have confirmed type 2 diabetes.

How accurate is the Hepatic Steatosis Index?

In the Lee et al. derivation cohort of 10,724 subjects, HSI had an AUROC of 0.812 (95% CI 0.801–0.824). At HSI 36, 85.6% were correctly classified. Meta-analyses confirm ~81% overall accuracy for detecting steatosis, but HSI poorly distinguishes moderate from severe steatosis without imaging.

Can HSI quantify steatosis severity grades?

HSI correlates with steatosis presence and shows a linear trend across grades, but it cannot reliably distinguish moderate from severe steatosis (S2 vs S3) without ultrasound or MRI-PDFF. Scores above 36 confirm likely steatosis; scores above 45 suggest more extensive burden. Imaging remains the gold standard for grading.

Can I use HSI in lean NAFLD?

Yes. Lean NAFLD (BMI < 25 with hepatic steatosis) is increasingly recognised—especially in Asian Indians with central adiposity and insulin resistance. HSI may be indeterminate in lean patients despite ultrasound-confirmed steatosis. Pair with imaging and metabolic workup (HbA1c, lipids, insulin resistance markers).

Does HSI work in alcoholic liver disease?

HSI was validated for NAFLD/MASLD, not alcoholic liver disease. Heavy alcohol elevates AST more than ALT (ratio < 1), which lowers HSI artificially. If alcohol intake exceeds 14 units/week, interpret HSI cautiously and use our Alcohol Impact Calculator alongside specialist assessment.

When should I get a liver ultrasound?

Get ultrasound if HSI is indeterminate (30–36) or high (> 36), if liver enzymes remain elevated despite lifestyle changes, if you have metabolic syndrome or diabetes with central obesity, or if FIB-4/NFS suggest fibrosis. Ultrasound is first-line non-invasive imaging for steatosis confirmation.

When should I see a hepatologist?

See a hepatologist if HSI > 36 with persistently elevated ALT/AST, if FIB-4 or NFS are indeterminate or high, if ultrasound shows steatosis with metabolic comorbidities, or if you have symptoms of advanced liver disease (jaundice, ascites, easy bruising).

Can I use HSI to monitor treatment response?

HSI can be tracked after sustained 7–10% weight loss, improved glycemic control, or lifestyle intervention—typically recheck at 6–12 months. A falling HSI supports steatosis regression. However, imaging (ultrasound, MRI-PDFF) better quantifies fat reduction. Pair with FIB-4/NFS to monitor fibrosis separately.

Is this Fatty Liver Severity Calculator a medical diagnosis?

No. This calculator is an educational screening tool based on the published Lee et al. HSI formula and cutoffs. It does not diagnose fatty liver disease, replace liver biopsy, or substitute for specialist care. Always discuss results with your doctor before making treatment decisions.

What is the HSI formula breakdown?

8 × ALT/AST ratio captures enzymatic steatosis signal (largest variable component). BMI adds body adiposity directly. Female sex (+2) and type 2 diabetes (+2) are binary adjustments from logistic regression. The calculator shows each component in your results for transparency.

How often should I recalculate HSI?

If HSI rules out steatosis and you maintain lifestyle changes, recheck annually with routine LFTs. If indeterminate or high, follow hepatology guidance—typically repeat after 6–12 months of sustained weight loss or with each specialist visit. Do not recalculate during acute illness when enzymes may be transiently elevated.

Can HSI be used in children?

No. HSI was validated in adults. Paediatric fatty liver disease requires specialist assessment with different reference ranges and staging tools. This calculator is designed for adults with BMI 15–60 kg/m².

What causes a falsely high HSI?

High BMI, elevated ALT with ALT/AST ratio > 1, female sex, and diabetes all raise HSI. Acute hepatitis flares, certain medications (statins, amiodarone), and NAFLD-related enzyme elevation can transiently increase ALT. Repeat labs when clinically stable before acting on a high score.

What causes a falsely low HSI?

Low BMI, normal ALT/AST ratio, male sex without diabetes, and AST > ALT (alcohol, muscle injury) lower HSI. A low score can miss steatosis in lean patients with central adiposity—ultrasound may still show fat despite low HSI.

Should I get FIB-4 if HSI is high?

Yes. High HSI confirms likely steatosis but does not assess fibrosis. Calculate FIB-4 (age, AST, ALT, platelets) or NAFLD Fibrosis Score (adds BMI, diabetes, albumin) to screen for advanced fibrosis (F3–F4). Steatosis and fibrosis require separate evaluation.

What lifestyle changes reverse fatty liver?

7–10% sustained body weight loss is the most evidence-based intervention for steatosis reversal. Mediterranean-style diet (olive oil, fish, vegetables, whole grains), limit fructose and sugary drinks, 150+ min/week aerobic exercise plus resistance training, and glycemic control if diabetic. Most mild steatosis improves within 6–12 months.

What is MASLD vs NAFLD?

MASLD (metabolic dysfunction-associated steatotic liver disease) is the 2023 renaming of NAFLD, emphasising metabolic drivers over alcohol exclusion. HSI validation predates the name change but applies to the same patient population—hepatic steatosis with cardiometabolic risk factors.

Does HSI replace the Fatty Liver Index (FLI)?

No—they are complementary. FLI uses BMI, waist circumference, triglycerides, and GGT. HSI uses ALT, AST, BMI, sex, and diabetes. Use HSI when you have liver enzymes but no lipid panel; use FLI when triglycerides and GGT are available. Both screen for steatosis, not fibrosis.

What units should I use for ALT and AST?

Enter ALT and AST in U/L (units per litre)—the standard reporting unit on most lab panels worldwide. Typical reference ranges: AST 10–40 U/L, ALT 7–56 U/L. Both must be greater than zero for the ALT/AST ratio calculation.

Fatty Liver Severity Calculator

Calculate the Hepatic Steatosis Index (HSI) from ALT, AST, BMI, sex, and diabetes status. Screen for hepatic steatosis severity in NAFLD/MASLD with validated cutoffs and exportable results.

Enter your details — results appear below after you calculate.

Demographics & body metrics

Sex

Type 2 diabetes?

Age (years)

Height (cm)

Weight (kg)

Liver function tests

AST (U/L)

Typical reference: 10–40 U/L

ALT (U/L)

Typical reference: 7–56 U/L · must be > 0 for ALT/AST ratio

How this Fatty Liver Severity calculator works

This tool computes the Hepatic Steatosis Index (HSI)—a validated blood-based score for hepatic steatosis (fatty liver) per Lee et al. Digestive and Liver Disease 2010. HSI < 30 rules out steatosis (~93% sensitivity); HSI > 36 rules it in (~92% specificity); scores between are indeterminate and need liver ultrasound or specialist review.

Enter sex, height and weight (BMI is calculated automatically), type 2 diabetes status, and AST and ALT (U/L) from your latest blood work.

Results include HSI value, full formula component breakdown (8 × ALT/AST, BMI, sex and diabetes adjustments), steatosis category (rule out / indeterminate / rule in), severity grade (unlikely through significant), ALT/AST ratio analysis, individual lab reference status, health score, clinical interpretation, FIB-4/NFS fibrosis screening guidance, and PDF export.

Pair with our FIB-4 Liver Fibrosis Calculator, NAFLD Fibrosis Score (NFS), Fatty Liver Risk, and Metabolic Syndrome Risk calculators for broader metabolic liver context. HSI screens for fat—not fibrosis. This is an educational screening tool—not a diagnosis. Seek hepatology care for high HSI with persistently elevated enzymes. Emergency care for jaundice, vomiting blood, or severe abdominal swelling.

Quick reference: HSI < 30 rules out steatosis · 30 to 36 is indeterminate (needs ultrasound) · HSI > 36 suggests likely steatosis · > 45 suggests more extensive burden. Scroll below for formula breakdown, worked examples, HSI vs FIB-4 vs NFS, steatosis grades S0–S3, clinical screening guidance, diet and lifestyle options, lab variable explanations, common mistakes, and 30 FAQs.

Fatty Liver Severity Calculator – Hepatic Steatosis Index (HSI)

Millions search "fatty liver severity calculator", "hepatic steatosis index", and "HSI calculator" each year. The Hepatic Steatosis Index (HSI) is a validated non-invasive formula that estimates the likelihood and severity of hepatic steatosis (fatty liver) using routine blood tests and body metrics: ALT, AST, BMI, sex, and type 2 diabetes status. Our free calculator applies the Lee et al. Digestive and Liver Disease 2010 formula with published cutoffs, component breakdown, severity grading, and exportable results.

Pair results with our FIB-4 Liver Fibrosis Calculator, NAFLD Fibrosis Score (NFS) Calculator, Fatty Liver Risk Calculator, and Metabolic Syndrome Risk Calculator for comprehensive metabolic liver health assessment.

Why Calculate Hepatic Steatosis Index?

NAFLD/MASLD affects roughly 25–30% of adults worldwide and is the leading cause of chronic liver disease. HSI helps triage who likely has hepatic steatosis versus who can be reassured—with ~93% sensitivity at the low cutoff and ~92% specificity at the high cutoff. Unlike fibrosis scores (FIB-4, NFS), HSI specifically screens for fat accumulation, not scarring.

1What You Enter

Demographics & body metrics

Age — years (18–100); for clinical context and fibrosis screening
Sex — male or female (+2 HSI if female)
Height & weight — BMI calculated automatically
Type 2 diabetes — yes/no (+2 HSI if yes)

Laboratory values

AST & ALT — U/L from liver panel

Example (Rule out — steatosis unlikely)

Male, BMI 22, ALT 20, AST 25, no diabetes → ALT/AST = 0.80 → HSI = 8 × 0.80 + 22 = 28.4 — below 30, steatosis unlikely. Continue healthy habits.

Example (Rule in — likely steatosis)

Female, BMI 32, ALT 50, AST 30, diabetes → ALT/AST = 1.667 → HSI = 8 × 1.667 + 32 + 2 + 2 = 49.34 — above 36, likely significant steatosis. Hepatology review and fibrosis screening advised.

Example (Indeterminate zone)

Female, BMI 26, ALT 30, AST 28, no diabetes → ALT/AST = 1.071 → HSI = 8 × 1.071 + 26 + 2 = 34.6 — indeterminate (30 to 36). Request liver ultrasound and metabolic workup.

2HSI Formula & Cutoffs

HSI = 8 × (ALT/AST) + BMI + 2 (if female) + 2 (if type 2 diabetes)

HSI Range	Category	Severity	Clinical Action
< 30	Rule out steatosis	Unlikely (S0)	Lifestyle maintenance; annual monitoring
30 to 36	Indeterminate	Possible (S1)	Liver ultrasound; metabolic workup
> 36	Rule in steatosis	Likely mild (36–40)	7–10% weight loss; FIB-4/NFS screening
> 40	Rule in steatosis	Likely moderate (40–45)	Intensified lifestyle; hepatology if enzymes persist
> 45	Rule in steatosis	Likely significant (>45)	Hepatology review; imaging quantification

Published by Lee et al. in a cohort of 10,724 Korean subjects. AUROC 0.812. HSI < 30: sensitivity 93.1% for ruling out NAFLD. HSI > 36: specificity 92.4% for detecting NAFLD.

HSI vs FIB-4 vs NFS vs Fatty Liver Risk — When to Use Each

Calculator	Screens For	Key Inputs	Best Use
HSI (this tool)	Steatosis (fat)	ALT, AST, BMI, sex, diabetes	First-line steatosis screening with basic labs
FIB-4	Advanced fibrosis (F3–F4)	Age, AST, ALT, platelets	After steatosis confirmed; 4 inputs only
NAFLD NFS	Advanced fibrosis (F3–F4)	Age, BMI, diabetes, AST, ALT, platelets, albumin	NAFLD-specific fibrosis staging
Fatty Liver Risk	Future NAFLD risk	Lifestyle, waist, diet, alcohol	No blood tests yet; prevention screening

Clinical pathway: Fatty Liver Risk (no labs) → HSI (steatosis with enzymes) → FIB-4 or NFS (fibrosis staging) → FibroScan (if indeterminate). Steatosis severity and fibrosis stage are independent — always assess both.

Understanding Steatosis Grades (S0–S3)

Histological steatosis is graded by the percentage of hepatocytes containing fat droplets. HSI detects presence of steatosis reliably but cannot precisely grade S2 vs S3 without imaging.

Grade	Liver Fat %	HSI Correlation	Reversibility
S0 — None	< 5%	HSI < 30	N/A — maintain health
S1 — Mild	5–33%	HSI 30–40	Highly reversible with lifestyle
S2 — Moderate	33–66%	HSI 40–45	Reversible; may need specialist care
S3 — Severe	> 66%	HSI > 45 (approximate)	Reversible but higher NASH/fibrosis risk

Worked HSI Examples

Example (Rule out — steatosis unlikely)

Male, 175 cm, 70 kg (BMI 22.9), ALT 20, AST 25, no diabetes. ALT/AST = 0.80 → HSI = 8 × 0.80 + 22.9 = 29.3 — below 30, steatosis unlikely. Continue healthy habits.

Example (Indeterminate zone)

Female, 162 cm, 72 kg (BMI 27.4), ALT 35, AST 30, no diabetes. ALT/AST = 1.167 → HSI = 33.2 — indeterminate. Request liver ultrasound and metabolic panel.

Example (Rule in — likely steatosis)

Male, 175 cm, 92 kg (BMI 30.0), ALT 48, AST 35, no diabetes. ALT/AST = 1.371 → HSI = 40.97 — likely moderate steatosis. Target 7–10% weight loss; calculate FIB-4.

Example (Rule in — significant burden)

Female, 160 cm, 82 kg (BMI 32.0), ALT 55, AST 32, diabetes yes. ALT/AST = 1.719 → HSI = 49.75 — likely significant steatosis. Hepatology referral and fibrosis screening advised.

Lifestyle Interventions for Fatty Liver

7–10% weight loss — most evidence-based intervention for steatosis reversal; even 3–5% improves enzymes
Mediterranean diet — olive oil, fish, vegetables, whole grains; limit red meat and processed foods
Limit fructose — sugary drinks and high-fructose corn syrup drive hepatic de novo lipogenesis
Exercise — 150+ min/week aerobic plus resistance training 2–3× weekly; reduces liver fat independent of weight loss
Alcohol — limit or avoid; even moderate intake worsens steatosis in MASLD
Glycemic control — HbA1c target per diabetes guidelines; GLP-1 agonists show emerging liver benefits

India & South Asia Screening Notes

NAFLD prevalence in India exceeds 25% in urban adults, with higher rates in those with type 2 diabetes and metabolic syndrome. Asian Indians develop steatosis at lower BMI ("lean NAFLD") due to central adiposity and insulin resistance—HSI may be indeterminate despite ultrasound steatosis. Use Asian waist cutoffs (≥80 cm women, ≥90 cm men) alongside HSI. Pair with our Waist-to-Height Ratio Calculator and Insulin Resistance Calculator.

Common HSI Mistakes to Avoid

1. Confusing steatosis with fibrosis

High HSI means likely fat in the liver—not scarring. Always screen fibrosis separately with FIB-4 or NFS. A patient can have severe steatosis with no advanced fibrosis.

2. Ignoring indeterminate scores

HSI 30–36 cannot rule in or out steatosis. Request liver ultrasound rather than repeating HSI alone or assuming a healthy liver.

3. Using HSI during heavy alcohol use

Alcohol elevates AST more than ALT, lowering the ALT/AST ratio and artificially reducing HSI. Evaluate alcohol intake with our Alcohol Impact Calculator.

4. Treating low HSI as guaranteed healthy liver

Low HSI excludes significant steatosis but not future risk. Lean patients with central obesity may have discordant HSI and imaging. Continue metabolic monitoring.

5. Including prediabetes as diabetes

The Lee formula adds +2 only for type 2 diabetes, not prediabetes or IFG. Selecting Yes incorrectly raises HSI by 2 points.

When to Seek Emergency Care

Jaundice (yellow eyes or skin) with high HSI and elevated enzymes
Vomiting blood or black tarry stools
Severe abdominal pain or rapidly enlarging abdomen
Confusion, drowsiness, or personality change (hepatic encephalopathy)
Call 102 or 108 (India ambulance) or go to the nearest emergency department

Frequently Asked Questions (FAQs)

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Fatty Liver Severity Calculator

Demographics & body metrics

Liver function tests

How this Fatty Liver Severity calculator works

Fatty Liver Severity Calculator – Hepatic Steatosis Index (HSI)

Why Calculate Hepatic Steatosis Index?

1What You Enter

Demographics & body metrics

Laboratory values

Example (Rule out — steatosis unlikely)

Example (Rule in — likely steatosis)

Example (Indeterminate zone)

2HSI Formula & Cutoffs

HSI vs FIB-4 vs NFS vs Fatty Liver Risk — When to Use Each

Understanding Steatosis Grades (S0–S3)

Worked HSI Examples

Example (Rule out — steatosis unlikely)

Example (Indeterminate zone)

Example (Rule in — likely steatosis)

Example (Rule in — significant burden)

Lifestyle Interventions for Fatty Liver

India & South Asia Screening Notes

Common HSI Mistakes to Avoid

1. Confusing steatosis with fibrosis

2. Ignoring indeterminate scores

3. Using HSI during heavy alcohol use

4. Treating low HSI as guaranteed healthy liver

5. Including prediabetes as diabetes

When to Seek Emergency Care

Frequently Asked Questions (FAQs)

What is the Fatty Liver Severity Calculator?

How is the Hepatic Steatosis Index (HSI) calculated?

What HSI cutoffs indicate fatty liver?

What does a low HSI mean?

What does an indeterminate HSI mean?

What does a high HSI mean?

What labs do I need for the HSI calculator?

How is HSI different from FIB-4 or NAFLD Fibrosis Score?

How is HSI different from the Fatty Liver Risk Calculator?

What is the significance of ALT/AST ratio in HSI?

Why does female sex add 2 points to HSI?

Why does diabetes add 2 points to HSI?

How accurate is the Hepatic Steatosis Index?

Can HSI quantify steatosis severity grades?

Can I use HSI in lean NAFLD?

Does HSI work in alcoholic liver disease?

When should I get a liver ultrasound?

When should I see a hepatologist?

Can I use HSI to monitor treatment response?

Is this Fatty Liver Severity Calculator a medical diagnosis?

What is the HSI formula breakdown?

How often should I recalculate HSI?

Can HSI be used in children?

What causes a falsely high HSI?

What causes a falsely low HSI?

Should I get FIB-4 if HSI is high?

What lifestyle changes reverse fatty liver?

What is MASLD vs NAFLD?

Does HSI replace the Fatty Liver Index (FLI)?

What units should I use for ALT and AST?

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Fatty Liver Risk Calculator

NAFLD Fibrosis Score (NFS) Calculator

FIB-4 Liver Fibrosis Calculator

Metabolic Syndrome Risk Calculator

Insulin Resistance (HOMA-IR) Calculator

Type 2 Diabetes Risk Assessment Calculator

Body Mass Index (BMI) Calculator

Triglyceride/HDL Ratio Calculator

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