HOMA-IR Calculator — Insulin Resistance

How HOMA-IR Calculator Works?

The HOMA-IR Calculator estimates insulin resistance from two fasting measurements: fasting blood glucose and fasting insulin. It is based on the Homeostatic Model Assessment, which uses the relationship between circulating glucose and insulin under fasting conditions. Higher values generally indicate that more insulin is required to maintain fasting glucose levels.

When fasting glucose is entered in mg/dL and fasting insulin in µIU/mL or mIU/L, the calculator applies:

When fasting glucose is entered in mmol/L and fasting insulin in µIU/mL or mIU/L, the corresponding equation is:

The result is an index rather than a concentration. For example, fasting glucose of 100 mg/dL and fasting insulin of 10 µIU/mL produces a HOMA-IR score of approximately 2.47. A screening interpretation may use broad bands such as the following, although the precise cutoffs vary by laboratory, population, and clinical context:

The calculator's interpretation is intended for screening and educational use. It should be considered alongside glucose status, A1C, lipid results, body composition, medications, symptoms, and a qualified clinician's assessment.

Practical Use Cases

Clinicians and diabetes-screening teams can use HOMA-IR as an additional context measure when reviewing fasting glucose and insulin from the same blood draw. For example, a score near 3 may prompt closer evaluation of glycemic risk, A1C, lipid abnormalities, and other metabolic findings rather than being treated as a diagnosis by itself.

People monitoring metabolic health can use the calculator to understand how their fasting glucose and insulin results relate to a general insulin-resistance screening index. Comparing results over time is most meaningful when the tests are collected under similar fasting conditions and interpreted with a healthcare professional.

Researchers and health educators can use HOMA-IR to summarize fasting glucose-insulin relationships in population studies, educational examples, or metabolic-health analyses. The selected glucose and insulin values should be recorded with their laboratory methods and participant characteristics because thresholds are not universal.

Nutrition and fitness professionals may use the result as a discussion point when supporting clients who already have clinician-provided laboratory data. A higher score can justify referral for medical evaluation, but it should not be used alone to prescribe treatment or diagnose diabetes.

Accuracy and Limitations

HOMA-IR is an estimate, not a direct measurement of insulin sensitivity, and its accuracy depends on reliable fasting glucose and fasting insulin results obtained from the same sample after an appropriate overnight fast. The calculator accepts glucose values from 20 to 600 mg/dL or mmol/L and insulin values from 0.1 to 500 µIU/mL or mIU/L, but values within these ranges can still be misleading during acute illness, pregnancy, major stress, recent medication changes, irregular fasting, or conditions affecting pancreatic insulin production. Laboratory assay differences and population-specific thresholds can change the interpretation, so the displayed category should not be used alone to diagnose insulin resistance, prediabetes, or diabetes.

Quick Examples