What is TyG-BMI?
The triglyceride-glucose index (TyG) was proposed as a simple, low-cost marker of insulin resistance that only needs two routine fasting blood tests. Researchers later found that multiplying TyG by BMI — giving TyG-BMI — tracked insulin resistance better than either value alone, because it combines blood fats, blood sugar and body size. It has since been studied in relation to type 2 diabetes, fatty liver disease and cardiovascular risk.
The TyG-BMI formula
TyG = ln(fasting triglycerides [mg/dL] × fasting glucose [mg/dL] ÷ 2), where ln is the natural logarithm.
TyG-BMI = TyG × BMI.
Example: triglycerides 150 mg/dL, glucose 100 mg/dL and a BMI of 26.1 give TyG = ln(150 × 100 ÷ 2) = ln(7,500) = 8.92, and TyG-BMI = 8.92 × 26.1 ≈ 233.
mg/dL or mmol/L
Labs in the US report in mg/dL; the UK, Europe, India and many other countries use mmol/L. Choose your units and the calculator converts automatically: triglycerides × 88.57 and glucose × 18.016 turn mmol/L into mg/dL. Both tests must be fasting values, usually after 8–12 hours without food.
How to read the result
A higher TyG-BMI means more evidence of insulin resistance. However, there is no single agreed cut-off. Studies have reported different thresholds depending on age, sex, ethnicity and the condition being studied, so this calculator does not label your result as normal or abnormal. Use it to follow your own trend over time, and discuss blood test results with your doctor.
Related tools
For BMI alone, use the BMI Calculator, or the BMI Calculator India for Asian ranges.