Insulin Resistance Calculator: Triglyceride-Glucose Index

A triglyceride-based insulin resistance calculator usually estimates the triglyceride-glucose (TyG) index from your fasting triglyceride and glucose results; it does not directly measure insulin resistance or diagnose a condition. Enter both values in mg/dL to calculate the index, or use mmol/L values with the conversion shown below; the result is a dimensionless estimate that must be interpreted in context.

Formula

The standard TyG formula is: TyG = natural logarithm[(fasting triglycerides × fasting glucose) ÷ 2]. In symbols, TyG = ln(TG × G ÷ 2). Here, TG is fasting triglycerides in milligrams per deciliter (mg/dL), G is fasting glucose in mg/dL, and ln means the natural logarithm. The index is conventionally calculated using these units; do not put mmol/L values directly into this version of the formula.

Worked Example

Using the calculator’s default values:

• Triglycerides: 150 mg/dL
• Fasting glucose: 100 mg/dL
• Multiply: 150 × 100 = 15,000
• Divide by 2: 15,000 ÷ 2 = 7,500
• Take the natural logarithm: ln(7,500) ≈ 8.92

The calculated TyG index is 8.92 when rounded to two decimal places. This is an example of the arithmetic, not a diagnostic cutoff.

What the TyG Index Estimates

Insulin resistance describes a reduced response to insulin, the hormone that helps regulate glucose in the blood. The pancreas may compensate by producing more insulin, especially in earlier stages. A direct assessment of insulin sensitivity is complex, and research methods such as the hyperinsulinemic-euglycemic clamp are not routine screening tests.

The TyG index is a practical proxy studied in populations because it combines two commonly measured fasting blood markers. Triglycerides are a type of blood fat, while glucose is a sugar measured in the blood. Their relationship can reflect metabolic patterns associated with insulin resistance, but many influences affect each result. A proxy can help researchers compare groups or support clinical assessment; it cannot reveal an individual’s insulin response with certainty.

Using the Calculator and Converting Units

Use results from the same fasting blood draw when possible, and check the units printed on the laboratory report. If your values are reported in mmol/L, convert both before using the calculator:

• Triglycerides: mg/dL = mmol/L × 88.57 (approximately).
• Glucose: mg/dL = mmol/L × 18.02 (approximately).

For example, a triglyceride result of 1.7 mmol/L is about 151 mg/dL, and a glucose result of 5.6 mmol/L is about 101 mg/dL. Those converted values can then be entered in the formula. Conversion factors are rounded, so a small difference from a calculator using more precise factors is normal. The index itself has no physical unit.

Fasting instructions depend on the test and the clinician or laboratory. Do not change medication, skip food, or arrange a fast solely to use an online calculator; follow the instructions given for your blood test. If the samples were taken at different times or under different conditions, the resulting estimate may be less meaningful.

How to Interpret a Result

There is no single universally accepted TyG threshold that diagnoses insulin resistance for every person. Proposed cutoffs vary among studies and populations, partly because of differences in age, sex, ethnicity, health status, laboratory methods, and the reference method used. A result such as 8.92 should therefore not be labeled “normal” or “abnormal” using an isolated internet cutoff.

A clinician can interpret the result alongside the actual glucose and triglyceride values, medical history, and other relevant findings. Depending on the situation, this may include waist measurement, blood pressure, cholesterol results, or tests for diabetes. The TyG index does not replace established diagnostic testing for diabetes or prediabetes, and it does not establish why a triglyceride or glucose result is elevated.

Common Mistakes and Limitations

• Mixing units: Entering mmol/L directly into a formula designed for mg/dL produces a misleading result.
• Using nonfasting or mismatched results: Meals and differing collection conditions can affect blood measurements, especially triglycerides. Use the laboratory’s stated conditions and clinician guidance.
• Treating the estimate as a diagnosis: TyG is a research-supported surrogate, not a direct insulin measurement or a stand-alone diagnostic test.
• Overinterpreting small changes: Biological variation, laboratory variation, and rounding can shift the calculated value. Compare results cautiously and consider the underlying measurements.
• Ignoring other causes: Glucose and triglycerides can be influenced by multiple health conditions, medicines, diet, and other factors. A TyG calculation cannot identify the cause.

The formula also compresses two measurements into one number, which loses information: two people can have the same index but different glucose and triglyceride values. Review the component results rather than focusing only on the calculated index.

Frequently Asked Questions

What is the formula for the triglyceride-glucose index?
TyG = ln[(fasting triglycerides in mg/dL × fasting glucose in mg/dL) ÷ 2]. The result is a dimensionless index.

Can triglycerides alone calculate insulin resistance?
No. This calculator also requires fasting glucose. Even with both results, TyG estimates a metabolic pattern; it does not directly measure or diagnose insulin resistance.

Can I use mmol/L in the TyG formula?
Not in the standard mg/dL version shown here. Convert triglycerides by multiplying mmol/L by about 88.57 and glucose by about 18.02 before entering them.

What TyG value means insulin resistance?
No universal cutoff applies to everyone. Research thresholds vary, so a value should be interpreted with the laboratory results and a qualified clinician rather than used as a self-diagnosis.

Does a high TyG index mean I have diabetes?
No. TyG is not a diabetes diagnostic test. Diabetes and prediabetes are assessed using established tests and criteria interpreted by a healthcare professional.

When to Discuss the Results

Ask the clinician who ordered the blood tests how to interpret both component values and whether follow-up is appropriate. This is especially important if a result is outside the laboratory’s reference range, you have symptoms, or you have concerns about diabetes or cardiovascular risk. The calculator can explain the arithmetic, but only a full clinical assessment can put the numbers into personal context.

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in triglycerides | Fasting triglycerides | mg/dL | 150 | 0
in glucose | Fasting glucose | mg/dL | 100 | 0
out tyg | TyG index | - | ln((triglycerides * glucose) / 2) | 2