Triglyceride–glucose (TyG) index calculator
Calculate a research surrogate of insulin resistance from fasting triglycerides and fasting glucose.
Formula & units
TyG = ln[(triglycerides in mg/dL × glucose in mg/dL) ÷ 2]
ln means the natural logarithm. Triglycerides in mmol/L are multiplied by 88.57; glucose in mmol/L is multiplied by 18. Both are converted before calculation.
Worked example
Triglycerides 150 mg/dL and glucose 90 mg/dL give TyG 8.8173 using this convention.
What the result can tell you
Published TyG equations differ in where division by 2 occurs. ln[TG × glucose / 2] and ln[TG × glucose] / 2 yield different scales. Compare only with studies using the same formula; this page does not assign a diagnostic cutoff.
Read the interpretation guide →
Sources for this method
Questions about TyG index
Can I calculate an insulin resistance index without insulin?
TyG uses fasting triglycerides and glucose without an insulin measurement. It is a different surrogate and should not be treated as interchangeable with HOMA.
Source: Zhou et al. · TyG methodology, 2024 (opens in a new tab) · Related calculator → · Link to answer
Does the TyG index use a natural logarithm?
This calculator uses ln[(triglycerides × glucose)/2], with both concentrations in mg/dL. The division by two is inside the logarithm.
Source: Zhou et al. · TyG methodology, 2024 (opens in a new tab) · Related calculator → · Link to answer
What is a normal TyG index?
Interpretation depends on the study population and equation convention. Check the exact formula before comparing values with a published threshold.
Source: Zhou et al. · TyG methodology, 2024 (opens in a new tab) · Related calculator → · Link to answer
Related reading
HOMA-IR normal range: why cutoffs differ
A reference range only helps when it matches the model, assay and population used for your result.
Read the guide →LEARNING GUIDEFasting insulin vs HbA1c: what each test tells you
These markers describe different aspects of glucose regulation. One cannot be converted into the other.
Read the guide →LEARNING GUIDEFasting glucose and insulin test preparation
Start with the instructions for the tests actually ordered. A calculator cannot repair an unsuitable sample.
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