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TyG Index Calculator

Enter fasting triglycerides and glucose to compute your TyG index.

Result

8.87

How it is calculated

The index is TyG = ln( TG × Glu / 2 ), where TG is fasting triglycerides in mg/dL and Glu is fasting glucose in mg/dL, and ln is the natural logarithm (base e, not base 10). The tool multiplies the two values, halves the product, takes the natural log and shows the result with two decimals. Both fields must be above zero; an empty field, zero or a negative number gives no result. The tool does no unit conversion, so values from a lab report in mmol/L must be converted first (triglycerides × 88.57, glucose × 18.02 give mg/dL). The output is a bare number with no risk band attached.

Worked example

Suppose a fasting panel shows triglycerides of 150 mg/dL and glucose of 95 mg/dL. Multiply: 150 × 95 = 14,250. Halve it: 14,250 / 2 = 7,125. Take the natural logarithm: ln(7125) = 8.8713…, which the tool shows as 8.87. Because the index is logarithmic, doubling either lab value raises it by only about 0.69.

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Common mistakes

  • Typing mmol/L values straight in. Glucose of 5.3 mmol/L and triglycerides of 1.7 mmol/L give an index of 1.51, which is meaningless; convert to mg/dL first (about 95 and 150).
  • Using a non-fasting sample. Both inputs are meant to be fasting values, and a post-meal triglyceride or glucose reading inflates the index.
  • Comparing a TyG value computed with base-10 logarithms (or with the division by 2 left out) against a value from this tool. The numbers are on a different scale and cannot be compared directly.
  • Swapping in total cholesterol or HbA1c in place of triglycerides or glucose. Only those two measurements belong in the formula.

Sources

About this calculator

The TyG (triglyceride-glucose) index is calculated as TyG = ln(fasting triglycerides [mg/dL] × fasting glucose [mg/dL] ÷ 2) — a simple logarithmic combination of two routine lab values that has been validated in multiple clinical studies as a surrogate marker of insulin resistance, correlating closely with the more invasive hyperinsulinemic-euglycemic clamp technique and with HOMA-IR.

Because it needs only a standard fasting lipid panel and fasting glucose (no insulin assay, which many labs don't run routinely), researchers and primary-care clinicians use TyG as a low-cost screening tool for insulin resistance and cardiometabolic risk, particularly in population studies and in settings where insulin testing is unavailable or expensive — though it is a research-oriented index rather than a formally established diagnostic cutoff for any single disease.

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Comments (1)

  • Editorial team

    The index is a log scale, so it moves slowly: with the default fasting values of 150 and 100 mg/dL it is 8.92, and raising triglycerides by 10 percent to 165 only moves it to 9.02. That makes it better for comparing your own results over time under the same fasting conditions than for judging a single number. The tool attaches no risk band, so ask your clinician what a value means for you. Do you track it alongside other labs?

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