TyG Index Calculator

Enter your fasting triglycerides and fasting glucose from the same blood draw to get your triglyceride-glucose (TyG) index. It runs in your browser and sends nothing anywhere.

TyG = ln[ fasting triglycerides (mg/dL) × fasting glucose (mg/dL) ÷ 2 ]. A higher value goes with more insulin resistance in studies. No guideline sets a cut-off, so this page shows the number and how to read your trend.

Simental-Mendía 2008 formulaUS and SI unitsNothing leaves your browser
Triglycerides unit
Glucose unit
Enter both values to see the result. Everything is computed locally in your browser.

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What your TyG index means

A higher TyG index goes with more insulin resistance in research studies. No guideline sets a cut-off, so this calculator shows the number without a verdict.

Published cut-offs differ by population, sex and the reference test used (a glucose clamp or HOMA-IR), and a systematic review of the index's accuracy found cut-offs varied between studies and called for standardized values. A threshold quoted on another website comes from one study group and may not fit you.

The most reliable use is your own trend. Compare TyG across two or three fasting draws from the same lab, ideally before and after a change in diet, training or sleep. A falling number means triglycerides, fasting glucose or both have come down.

TyG does not diagnose anything
Diabetes and prediabetes are diagnosed from fasting glucose, HbA1c or a glucose tolerance test. TyG is a research index built from two routine results. If you also have a fasting insulin, HOMA-IR is the better-known measure, and FixFirst's analyzer scores it against defined bands.

Worked example: triglycerides 120, glucose 95

Both values are inside most labs' printed reference ranges and neither would carry a flag.

US units
TyG = ln( triglycerides mg/dL × glucose mg/dL ÷ 2 )
ln(120 × 95 ÷ 2) = ln(5,700) = 8.65
SI units
Convert first: triglycerides mmol/L × 88.57, glucose mmol/L × 18.0182
1.355 mmol/L → 120 mg/dL · 5.27 mmol/L → 95 mg/dL → TyG 8.65

The formula takes mg/dL values. This calculator converts mmol/L for you, so the two versions give the same TyG. Some papers write the formula as ln(triglycerides × glucose) ÷ 2, which gives a different number. This page uses the original 2008 form, so compare its result only with cut-offs published for that form.

Getting a TyG you can trust

Use triglycerides and glucose from one overnight-fasted draw. A non-fasting triglyceride can be far higher than a fasting one, and that moves the index on its own. Glucose and triglycerides taken on different days can't be combined.

Both inputs are on a standard lipid panel and metabolic panel, so there is no extra test to order. Our high glucose and high triglycerides guide covers what the pairing means and the tests to run alongside it.

Frequently asked questions

How is the TyG index calculated?
TyG = ln[fasting triglycerides (mg/dL) × fasting glucose (mg/dL) ÷ 2]. Both values must come from the same overnight-fasted draw. The formula is from Simental-Mendía, Rodríguez-Morán and Guerrero-Romero, Metabolic Syndrome and Related Disorders, 2008.
What is a normal TyG index?
No guideline defines one. Studies report different cut-offs by population, sex and reference test, and a systematic review found cut-offs varied between studies and called for standardized values. Use your own trend across fasting draws from one lab rather than a number from another source.
Is the TyG index the same as HOMA-IR?
No. HOMA-IR needs a fasting insulin result; TyG uses only triglycerides and glucose from a routine panel. They are both estimates of insulin resistance and they correlate, but their numbers are not interchangeable.
Why does a different website give me a different TyG?
Some papers use ln(triglycerides × glucose) ÷ 2 instead of ln(triglycerides × glucose ÷ 2). The two forms differ by a constant, so the results and the cut-offs are not interchangeable. This calculator uses the original 2008 form.
Do I need to fast for TyG?
Yes. Triglycerides rise after a meal, which inflates the index. Fast overnight, with no calories for at least 8 hours, before the draw.

References & Guidelines

Note: This calculator is for information and does not replace medical advice. TyG is a research index with no diagnostic cut-off.

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Related
HOMA-IR CalculatorThe better-known insulin resistance score, from fasting glucose and insulin.High Glucose + High TriglyceridesThe pairing that often travels with insulin resistance.Cholesterol Ratio CalculatorTG/HDL, Chol/HDL and non-HDL from one lipid panel.High TriglyceridesWhat raised triglycerides mean and what moves them.