Lipid Accumulation Product (LAP) Index Calculator

The Lipid Accumulation Product (LAP) Index is a biomarker that estimates visceral (internal organ) fat accumulation by combining waist circumference with fasting triglyceride levels. It was developed by Dr. Henry Kahn in 2005 and published in BMC Cardiovascular Disorders. Unlike BMI, which measures total body mass relative to height, the LAP specifically targets the metabolically active visceral fat that drives insulin resistance, fatty liver disease, and cardiovascular risk.

BMI divides weight by height squared and cannot distinguish muscle from fat, subcutaneous from visceral fat, or metabolically healthy from unhealthy obesity. A bodybuilder with high muscle mass may have a "obese" BMI despite low metabolic risk. The LAP Index uses waist circumference (central fat distribution) and triglycerides (lipid metabolism dysfunction), giving it superior predictive power for metabolic syndrome (AUC 0.80 to 0.91) compared to BMI (AUC 0.65 to 0.75) in head-to-head studies.

For males, a LAP below 30 is considered low risk. For females, below 23 is low risk. These sex-specific thresholds reflect differences in fat distribution: women naturally carry more subcutaneous fat (hips, thighs) and less visceral fat, so the formula uses a lower waist constant (58 vs 65) and lower risk thresholds. Scores above 50 for males or 40 for females indicate high risk and warrant metabolic screening.

Yes. Both components of the LAP formula are modifiable. Reducing waist circumference by 5 to 10 cm through caloric deficit and aerobic exercise directly lowers the score. Fasting triglycerides respond strongly to reduced sugar and refined carbohydrate intake, increased omega-3 fatty acids, regular exercise, and moderate alcohol reduction. A Mediterranean diet pattern has been shown to reduce triglycerides by 15 to 25% within 8 to 12 weeks. Weight loss of 5 to 7% of body weight typically produces meaningful LAP improvement.

Stand upright and breathe out normally. Wrap a flexible tape measure around your bare abdomen at the narrowest point between the bottom of your ribs and the top of your hip bones (iliac crest). This is typically at or near the navel. The tape should be snug but not compressing the skin. Measure in centimeters. For the LAP formula, consistent measurement technique is more important than the exact anatomical landmark, as long as you use the same method each time.

The American Heart Association classifies fasting triglycerides as: normal (under 150 mg/dL or 1.7 mmol/L), borderline high (150 to 199 mg/dL), high (200 to 499 mg/dL), and very high (500 mg/dL or above). For the LAP Index, even "borderline" triglycerides combined with a large waist can produce a high-risk score. This is the strength of the LAP: it captures the synergistic risk of central obesity plus dyslipidemia that neither measure flags alone.

The LAP Index has been validated in North American (NHANES), Brazilian, Iranian, Chinese, Korean, and European populations with consistent results. However, optimal cut-off values may differ by ethnicity because waist circumference norms vary. South Asian and East Asian populations tend to accumulate visceral fat at lower waist circumferences, so some researchers suggest lower cut-offs for these groups. The general risk tiers in this calculator are based on multi-ethnic averages and should be interpreted with clinical context.