HOMA-IR (Homeostasis Model Assessment of Insulin Resistance) is a mathematical model that estimates insulin resistance from fasting glucose and fasting insulin levels. It was first described by Matthews et al. in 1985 (Diabetologia 28:412–419) and is widely used in research and clinical practice as a surrogate marker for insulin resistance. A higher HOMA-IR score indicates greater insulin resistance. The gold standard for measuring insulin resistance is the euglycemic hyperinsulinemic clamp, but HOMA-IR provides a practical, low-cost estimate from a standard fasting blood draw.

HOMA-IR Calculator

Estimate your insulin resistance index from fasting glucose and fasting insulin using the Homeostasis Model Assessment (HOMA-IR) formula. Supports mg/dL and mmol/L glucose units.

Glucose unit

Fasting glucose

mg/dL

Fasting insulin

µIU/mL

HOMA-IR Score

Optimal
<1.0 Average
1.0–1.9 Possible IR
2.0–2.9 Likely IR
≥3.0

HOMA-IR is a screening estimate, not a diagnostic test. Thresholds are population-specific — there is no single universal cutoff. Consult your healthcare provider to interpret this result in context.

What HOMA-IR Tells You

HOMA-IR (Homeostasis Model Assessment of Insulin Resistance) is a mathematical estimate of how resistant your body's cells are to insulin. Insulin resistance occurs when the pancreas produces insulin normally but cells in the liver, muscle, and fat tissue no longer respond to it efficiently. The pancreas compensates by secreting more insulin — so both glucose and insulin may remain in a "normal" range while the underlying problem quietly progresses. HOMA-IR captures this dynamic: because it multiplies fasting glucose by fasting insulin, it rises even before either value crosses a clinical threshold individually.

The model was first described by Matthews et al. in 1985 in Diabetologia (28:412–419) and remains one of the most widely used surrogate markers of insulin resistance in epidemiological and clinical research. The gold standard measurement is the euglycemic hyperinsulinemic clamp, which is expensive and impractical outside a research setting. HOMA-IR provides a practical, low-cost alternative from a routine fasting blood draw. It is not a diagnostic test, but a signal worth discussing with your physician — particularly if it is trending upward over time.

Reference Ranges and Their Limitations

The table below shows commonly cited HOMA-IR interpretation categories. These ranges are derived from published literature and are widely used, but they are not universally standardised. No single clinical guideline has formally adopted one cutoff for all populations.

HOMA-IR Score	Commonly Cited Interpretation
Below 1.0	Optimal insulin sensitivity
1.0 – 1.9	Average insulin sensitivity (typical for most healthy adults)
2.0 – 2.9	Possible early insulin resistance (some studies use 2.5 as threshold)
3.0 and above	Likely significant insulin resistance

Important: no universal clinical threshold exists. Reported cutoffs vary considerably by population: approximately 1.6 in some East Asian cohorts, 2.0–2.5 in many European studies, and 2.5–3.0 in American and Latin American populations. Age, sex, ethnicity, body composition, and assay method all influence HOMA-IR values. This calculator uses the formula from Matthews et al. 1985 and the interpretation ranges most commonly cited in Western clinical research.

What Affects Your HOMA-IR Score

Diet. Diets high in refined carbohydrates, added sugars, and ultra-processed foods chronically raise fasting insulin. Lower-glycaemic, whole-food diets tend to improve insulin sensitivity over time.
Physical activity. Both aerobic exercise and resistance training independently improve insulin sensitivity, often within days. Prolonged sedentary behaviour has the opposite effect.
Sleep. Even one week of restricted sleep (below 6 hours per night) can significantly elevate fasting insulin and HOMA-IR. Slow-wave sleep in particular is important for glucose regulation.
Body weight and distribution. Excess visceral fat (abdominal obesity) is strongly associated with insulin resistance. Even modest weight loss of 5–10% of body weight can improve HOMA-IR meaningfully.
Medications. Corticosteroids, some antipsychotics, and certain HIV treatments can raise insulin resistance. Conversely, metformin, GLP-1 receptor agonists, and SGLT2 inhibitors lower it. Always account for medications when interpreting your result.
Stress hormones. Chronic psychological stress elevates cortisol, which antagonises insulin action and can raise fasting glucose and insulin independently of diet and exercise.

When to Get Tested

Fasting insulin is not included in all standard blood panels, but it can usually be requested alongside a fasting glucose test. To obtain valid values for HOMA-IR, both measurements must come from a blood draw taken after a minimum 8-hour overnight fast — typically done in the morning before breakfast. Drinking water is permitted. If you are unsure whether your values were collected fasted, do not use them in this calculator, as fed-state insulin levels are substantially higher and would produce a misleading score.

Testing is most relevant for people with risk factors for insulin resistance and metabolic dysfunction: excess abdominal weight, a family history of type 2 diabetes, polycystic ovary syndrome (PCOS), high triglycerides, low HDL cholesterol, elevated blood pressure, a history of gestational diabetes, or existing prediabetes. Tracking HOMA-IR over time — for example, before and after a dietary or lifestyle intervention — can provide useful feedback on whether insulin sensitivity is improving. It is also relevant for conditions including type 2 diabetes, prediabetes, and insulin resistance monitoring.

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Frequently Asked Questions

What is HOMA-IR?

HOMA-IR (Homeostasis Model Assessment of Insulin Resistance) is a mathematical model that estimates insulin resistance from fasting glucose and fasting insulin levels. It was first described by Matthews et al. in 1985 (Diabetologia 28:412–419) and is widely used as a surrogate marker for insulin resistance in clinical and research settings. A higher HOMA-IR score indicates greater insulin resistance. The gold standard measurement is the euglycemic hyperinsulinemic clamp, but HOMA-IR provides a practical, low-cost estimate from a routine fasting blood draw.

How do I interpret my HOMA-IR score?

Commonly cited ranges are: below 1.0 suggests optimal insulin sensitivity; 1.0–1.9 is considered average for most adults in Western populations; 2.0–2.9 suggests possible early insulin resistance (some references use 2.5 as the threshold); 3.0 and above suggests likely significant insulin resistance. However, there is no single universally accepted cutoff. Studies report different thresholds: approximately 1.6 in some East Asian cohorts, 2.0–2.5 in many European studies, and up to 3.0 in some American populations. Always discuss your result with a healthcare provider who knows your full clinical picture.

When should I get tested for insulin resistance?

Testing for fasting insulin and glucose (which allows HOMA-IR calculation) may be appropriate if you have risk factors for insulin resistance, including excess weight or abdominal obesity, a family history of type 2 diabetes, polycystic ovary syndrome (PCOS), high triglycerides, low HDL cholesterol, elevated blood pressure, a history of gestational diabetes, or existing prediabetes. Discuss with your doctor whether adding fasting insulin to your routine blood work is appropriate for your situation.

Do I need to fast before the blood test?

Yes. Both fasting glucose and fasting insulin must be measured after an overnight fast of 8 to 12 hours. Food raises both glucose and insulin substantially, which would produce an inaccurate (falsely elevated) HOMA-IR score. Water is fine to drink during the fast. The blood draw is typically done in the morning before breakfast. If you are unsure whether your values were collected fasted, do not enter them into this calculator.

What should I do if my HOMA-IR is high?

A high HOMA-IR score is not a diagnosis — it is a screening signal that warrants further evaluation. Share your result with your doctor, who can assess it alongside other clinical information. Lifestyle modifications that commonly improve insulin sensitivity include regular aerobic and resistance exercise, a lower-glycaemic diet rich in whole foods, adequate sleep (7–9 hours per night), weight loss if applicable, and stress management. Some medications can also affect insulin sensitivity. Repeat testing after lifestyle changes can help track progress over time.

Medical Disclaimer: This HOMA-IR calculator is provided for educational and informational purposes only. HOMA-IR is a screening estimate derived from a mathematical model and is not a diagnostic test for insulin resistance or any medical condition. Results should not be used as a substitute for professional medical advice, diagnosis, or treatment. Reference ranges are commonly cited values from published literature and vary by population, age, sex, ethnicity, and insulin assay method — no single universal threshold has been formally adopted. Always consult a qualified healthcare provider for personalised interpretation of your blood test results. Based on: Matthews DR, et al. Homeostasis model assessment: insulin resistance and β-cell function from fasting plasma glucose and insulin concentrations in man. Diabetologia. 1985;28(7):412–419.

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