HOMA-IR Calculator – Insulin Resistance Assessment
Calculate your HOMA-IR score from fasting glucose and insulin to assess insulin resistance and metabolic health.
Enter your fasting glucose and fasting insulin values, choose your units, and get an instant HOMA-IR score with clinical interpretation.
HOMA-IR Calculator – Insulin Resistance Assessment
Calculate your HOMA-IR score from fasting glucose and insulin to assess insulin resistance and metabolic health.
About the HOMA-IR Calculator
HOMA-IR (Homeostatic Model Assessment for Insulin Resistance) is a widely validated mathematical model that estimates the degree of insulin resistance from two routine fasting blood measurements: glucose and insulin. Developed by Matthews and colleagues in 1985, the index provides a simple, non-invasive, and cost-effective alternative to the gold-standard hyperinsulinemic-euglycemic clamp technique for clinical and research settings. Its core formula — HOMA-IR = (fasting glucose in mmol/L × fasting insulin in μU/mL) ÷ 22.5 — reflects the homeostatic relationship between glucose and insulin during the fasting state. The constant 22.5 is derived from the product of normal fasting glucose (4.5 mmol/L) and normal fasting insulin (5 μU/mL) in healthy, lean individuals, so that a perfectly sensitive metabolic system returns a score close to 1.0.
Insulin resistance is a condition in which cells throughout the body — particularly in muscle, fat, and liver — fail to respond normally to insulin signaling. The pancreas compensates by secreting progressively more insulin to maintain blood glucose control, which raises circulating insulin levels and drives the HOMA-IR score upward. Left unchecked, this compensatory hyperinsulinemia strains the beta cells of the pancreas, eventually reducing their capacity to secrete adequate insulin and increasing the risk of type 2 diabetes. Insulin resistance is also tightly linked to the metabolic syndrome, dyslipidemia, non-alcoholic fatty liver disease, polycystic ovary syndrome, and cardiovascular disease.
Established clinical thresholds categorize HOMA-IR scores as follows: below 1.0 reflects normal insulin sensitivity; 1.0 to 2.5 indicates mild insulin resistance, often manageable with lifestyle changes such as regular aerobic exercise, reduced refined carbohydrate intake, and weight management; 2.5 to 5.0 represents moderate insulin resistance, where medical consultation and possible pharmacological support are recommended; and above 5.0 signals severe insulin resistance requiring prompt clinical evaluation. These thresholds are population averages — individual laboratories and ethnic groups may use slightly different cutpoints, and your clinician's interpretation should always take your full clinical picture into account.
To obtain reliable HOMA-IR values, blood samples should be drawn after an overnight fast of eight to twelve hours. Physical activity, acute illness, corticosteroids, and certain other medications can transiently affect both glucose and insulin levels. The calculator accepts glucose in mg/dL or mmol/L and insulin in μU/mL or pmol/L, automatically applying the appropriate conversion factors (1 mmol/L = 18 mg/dL for glucose; 1 pmol/L = 0.167 μU/mL for insulin). Serial HOMA-IR measurements over time provide more useful information than a single reading, allowing clinicians and patients to track the metabolic response to lifestyle interventions or medication.
This calculator is provided for educational and clinical support purposes only and does not constitute medical advice. A HOMA-IR score should always be interpreted within the broader context of clinical findings, additional laboratory tests, and the guidance of a qualified healthcare professional.
HOMA-IR calculator examples
Realistic clinical scenarios showing how fasting glucose and insulin levels translate to HOMA-IR scores.
| Fasting values | HOMA-IR | Interpretation |
|---|---|---|
| Glucose 85 mg/dL, Insulin 5 μU/mL | 1.05 | Near-normal insulin sensitivity. Both values are within the healthy range for a fasting adult. |
| Glucose 105 mg/dL, Insulin 12 μU/mL | 3.11 | Mild-to-moderate insulin resistance. Lifestyle modifications including diet and exercise are usually recommended at this level. |
| Glucose 120 mg/dL, Insulin 18.5 μU/mL | 5.48 | Moderate-to-severe insulin resistance. Medical consultation is recommended to evaluate diabetes risk and metabolic syndrome. |
| Glucose 140 mg/dL, Insulin 25 μU/mL | 8.64 | Severe insulin resistance requiring immediate medical attention. This level is strongly associated with type 2 diabetes and cardiovascular risk. |
How to use the HOMA-IR calculator
- Fast for 8–12 hours (overnight) before having your blood drawn to ensure accurate fasting glucose and insulin levels.
- Enter your fasting glucose value and select the correct unit (mg/dL or mmol/L) from your lab report.
- Enter your fasting insulin value and select the correct unit (μU/mL or pmol/L).
- Click Calculate HOMA-IR to see your score and its clinical category instantly.
- Discuss the result with your healthcare provider — a single score is most meaningful when tracked over time alongside other metabolic markers.
HOMA-IR calculator FAQ
What does the HOMA-IR score measure?
HOMA-IR estimates the degree of insulin resistance by modeling the steady-state relationship between fasting glucose and fasting insulin. A higher score indicates that the pancreas must produce more insulin to keep blood glucose in check, which is the hallmark of insulin resistance and a key risk factor for type 2 diabetes and metabolic syndrome.
What is a normal HOMA-IR value?
A HOMA-IR below 1.0 is generally considered normal insulin sensitivity, while values between 1.0 and 2.5 indicate mild insulin resistance. Scores between 2.5 and 5.0 represent moderate resistance, and values above 5.0 indicate severe insulin resistance. These thresholds may vary by population, ethnic group, and individual laboratory.
Why do I need to fast before the test?
Both glucose and insulin rise after eating, which would invalidate the HOMA model's homeostatic assumptions. Fasting for 8–12 hours ensures that glucose and insulin levels reflect your baseline metabolic state rather than a postprandial response, giving the most reproducible and clinically meaningful result.
Can I use mmol/L and pmol/L units?
Yes. The calculator accepts glucose in mg/dL or mmol/L (converting with 1 mmol/L = 18 mg/dL) and insulin in μU/mL or pmol/L (converting with 1 pmol/L = 0.167 μU/mL). Select the units matching your lab report and the calculator handles the conversion automatically.
What can I do to lower a high HOMA-IR score?
Lifestyle interventions are the first line of management. Regular aerobic and resistance exercise, a diet lower in refined carbohydrates and added sugars, weight loss (even 5–10% of body weight), better sleep quality, and stress reduction have all been shown to improve insulin sensitivity. In some cases, metformin or other medications may be prescribed by your doctor.
Is the HOMA-IR calculator suitable for people with type 1 diabetes?
HOMA-IR is less reliable in type 1 diabetes because the model assumes normal pancreatic beta-cell function. In type 1 diabetes, endogenous insulin secretion is absent or severely impaired, which can produce misleadingly low HOMA-IR values even in the presence of significant insulin resistance. Consult your endocrinologist for the most appropriate assessment method.