5.55
mmol/L
2.96
33.8
%
4
5.55
mmol/L
2.96
33.8
%
4
The HOMA-IR Calculator estimates insulin resistance using the Homeostatic Model Assessment, a widely used mathematical model developed by Matthews et al. in 1985. HOMA-IR quantifies how effectively the body uses insulin to regulate blood sugar — a fundamental measure in metabolic health that plays a central role in the pathophysiology of type 2 diabetes, metabolic syndrome, polycystic ovary syndrome (PCOS), and cardiovascular disease.
Insulin resistance occurs when cells in the muscles, fat, and liver do not respond efficiently to insulin, requiring the pancreas to produce more insulin to maintain normal blood glucose levels. This compensatory hyperinsulinemia can persist for years before blood glucose rises into the diabetic range. HOMA-IR can detect this insulin resistance years before diabetes diagnosis, making it a valuable screening and monitoring tool.
The HOMA model uses two simple fasting blood tests — fasting glucose and fasting insulin — to estimate two key metabolic parameters. HOMA-IR (insulin resistance) reflects how much insulin the pancreas needs to produce to keep glucose at its current level. HOMA-%B (beta-cell function) estimates the functional capacity of the insulin-producing beta cells in the pancreas. Together, these values provide insight into the underlying metabolic dysfunction.
Since its introduction, HOMA-IR has been validated against the gold-standard hyperinsulinemic-euglycemic clamp technique and shown strong correlation (r = 0.88) in multiple populations. While the clamp technique is the most accurate measure of insulin resistance, it requires several hours and IV insulin infusion, making it impractical for routine clinical use. HOMA-IR requires only two fasting blood values and can be calculated in seconds.
HOMA-IR is used globally in clinical research and increasingly in clinical practice. It is particularly valuable for monitoring the metabolic effects of lifestyle interventions, medications like metformin, and weight management programs. Serial HOMA-IR measurements can demonstrate improvement in insulin sensitivity even before changes in glucose or HbA1c become apparent, providing early positive feedback for patients making lifestyle changes.
The HOMA model formulas (Matthews et al., 1985):
HOMA-IR = Fasting Insulin (µU/mL) × Fasting Glucose (mmol/L) / 22.5
HOMA-%B = 20 × Fasting Insulin / (Fasting Glucose [mmol/L] − 3.5)
HOMA-%S = 1 / HOMA-IR × 100
If glucose is entered in mg/dL, it is first converted to mmol/L by dividing by 18.0156. The constant 22.5 represents the product of normal fasting glucose (4.5 mmol/L) × normal fasting insulin (5 µU/mL). Insulin resistance levels: 1 = Optimal (<1.0), 2 = Normal (1.0-1.9), 3 = Early Resistance (1.9-2.9), 4 = Significant Resistance (≥2.9).
Level 1 (HOMA-IR <1.0): Optimal insulin sensitivity. The body uses insulin very efficiently. Level 2 (1.0-1.9): Normal range. Most healthy individuals fall here. Level 3 (1.9-2.9): Early insulin resistance. Lifestyle modifications (exercise, weight loss, dietary changes) are recommended. This stage is often reversible. Level 4 (≥2.9): Significant insulin resistance. Associated with high risk for type 2 diabetes, metabolic syndrome, and cardiovascular disease. Medical intervention (metformin, lifestyle overhaul) should be considered. HOMA-%B indicates beta-cell function — values declining over time suggest progressive pancreatic exhaustion.
Inputs
Results
Fasting glucose 90 mg/dL with insulin 6 µU/mL gives HOMA-IR 1.33 — normal insulin sensitivity.
Inputs
Results
Fasting glucose 115 mg/dL with insulin 22 µU/mL gives HOMA-IR 6.25 — significant insulin resistance with compensatory hyperinsulinemia.
HOMA-IR (Homeostatic Model Assessment of Insulin Resistance) is a mathematical model that estimates insulin resistance from fasting blood glucose and fasting insulin levels. Values below 2.0 are considered normal, while values above 2.5-2.9 indicate clinically significant insulin resistance.
Normal HOMA-IR is generally below 1.9-2.0, with optimal being below 1.0. Values above 2.5-2.9 are considered insulin resistant. However, cutoffs vary by population, ethnicity, age, and BMI. Your healthcare provider can interpret your result in the context of your overall health.
HOMA-IR requires two fasting blood tests: fasting glucose and fasting insulin. Both must be drawn after 8-12 hours of fasting. The formula is: HOMA-IR = (Fasting Insulin × Fasting Glucose) / 22.5, with glucose in mmol/L. It is a simple calculation from routine lab values.
HOMA-%B estimates beta-cell function — how well your pancreas produces insulin. Values around 100% are normal. In early insulin resistance, HOMA-%B is often elevated (compensatory hyperinsulinemia). As the pancreas fails over time, HOMA-%B declines, signaling progression toward diabetes.
Yes. Multiple longitudinal studies show that elevated HOMA-IR predicts future development of type 2 diabetes, often 5-10 years before glucose levels become diagnostic. It is one of the earliest detectable metabolic abnormalities in the diabetic trajectory.
Exercise is the most potent reducer of HOMA-IR — both aerobic and resistance training improve insulin sensitivity independently. Weight loss (even 5-7% of body weight), reducing refined carbohydrates and sugar, improving sleep quality, managing stress, and medications like metformin all lower HOMA-IR.
Yes, many medications affect HOMA-IR. Metformin, thiazolidinediones, and GLP-1 agonists lower it. Corticosteroids, some antipsychotics, and thiazide diuretics can increase it. Always inform your doctor about all medications when interpreting HOMA-IR results.
HOMA-IR measures fasting insulin resistance from a single blood draw. The oral glucose tolerance test (OGTT) measures how the body handles a glucose load over 2 hours. They measure overlapping but different aspects of glucose metabolism. OGTT is better at detecting postprandial glucose intolerance.
HOMA-IR testing is particularly valuable for: people with family history of diabetes, individuals with central obesity, women with PCOS, patients with metabolic syndrome features, and anyone with borderline glucose levels. It is not part of routine screening but can be requested by your doctor.
HOMA-%S (insulin sensitivity) is the reciprocal of HOMA-IR expressed as a percentage. It is calculated as 100 / HOMA-IR. A HOMA-%S of 100% represents normal insulin sensitivity. Lower values indicate more resistance. It provides the same information as HOMA-IR in an alternative format.
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