HOMA-IR Calculator
Calculate your HOMA-IR (Homeostatic Model Assessment of Insulin Resistance) from fasting glucose and fasting insulin. The most widely used research index for estimating insulin resistance. Educational reference only.
🔬 HOMA-IR Calculator
HOMA-IR Result
β-cell function %
mg/dL
µIU/mL
HOMA-IR Reference Ranges
| HOMA-IR Value | Interpretation | Clinical Context |
|---|---|---|
| < 1.0 | Optimal insulin sensitivity | Low metabolic risk |
| 1.0 – 1.9 | Normal range | Acceptable in most adults |
| 2.0 – 2.9 | Borderline | Monitor; consider lifestyle review |
| 3.0 – 4.9 | Insulin resistance likely | Discuss with provider; metabolic syndrome risk |
| ≥ 5.0 | Significant insulin resistance | High risk; clinical evaluation warranted |
Thresholds vary by study and population. Some references use ≥ 2.5 as the resistance threshold. Discuss your result in context with your provider.
HOMA-IR Formula
Developed by Matthews et al. in 1985, HOMA-IR uses a mathematical model of the fasting glucose-insulin feedback loop. The denominator 405 converts units so the result is dimensionless (normal ≈ 1.0 in a healthy non-diabetic adult). The mmol/L version uses a divisor of 22.5 instead of 405.
What your HOMA-IR score is really telling you
HOMA-IR takes two numbers from a single fasting blood draw — your glucose and your insulin — and answers one practical question: how hard is your body working to keep blood sugar normal? When insulin is doing its job well, a modest amount holds glucose in range and your score stays low. When your cells start tuning insulin out, the pancreas compensates by releasing more of it. Your glucose can still look perfectly "normal" on a standard test, but that quietly elevated insulin is what pushes HOMA-IR up — which is why the score often spots a problem years before fasting glucose alone does.
That head start is the whole point. A slowly climbing HOMA-IR is frequently the first measurable hint of the drift toward prediabetes, type 2 diabetes, fatty liver, and the wider cluster of changes called metabolic syndrome. Treat it as a screening signal rather than a verdict, though — one value on one morning can't capture the full picture, and it only means something when you read it alongside your weight, blood pressure, lipids, and family history.
Why fasting properly changes your result
HOMA-IR is only valid on genuinely fasting blood. Anything with calories in the hours beforehand lifts both glucose and insulin, inflating the score and making it unreliable. The accepted standard is an 8–12 hour overnight fast with nothing but water, followed by an early-morning draw before you've eaten, exercised hard, or had coffee.
Common reasons a score reads higher than expected
A carb-heavy dinner the night before, a fast that was too short, a recent illness or poor night's sleep, acute stress, and some medications such as steroids can all nudge insulin upward temporarily. Insulin assays also differ between labs, so a small shift between tests may reflect the lab, not your body. If a result surprises you, the most useful next step is usually to repeat it under clean, consistent fasting conditions before drawing any conclusions.
Steps that can lower a high HOMA-IR over time
Insulin resistance responds to the same habits that improve metabolic health overall, and the changes don't have to be dramatic to register. Losing even 5–7% of body weight, walking after meals, building muscle through resistance training, easing back on refined carbohydrates and sugary drinks, and protecting your sleep all help your cells respond to insulin again. Improvements tend to show up over weeks to months rather than days, so retest under the same fasting conditions to compare fairly — and use the trend, with your provider's input, to guide what's working.
Frequently Asked Questions
What is a normal HOMA-IR level?
A HOMA-IR under about 1.0 reflects optimal insulin sensitivity, and roughly 1.0–1.9 is normal for most healthy adults. Values of 2.0–2.9 are borderline, and 3.0 or above suggests insulin resistance. Cut-offs vary by population and lab, so interpret the result with your provider.
How is HOMA-IR calculated?
HOMA-IR = (fasting glucose in mg/dL × fasting insulin in µIU/mL) ÷ 405. If glucose is in mmol/L, divide by 22.5 instead. Both values must come from the same fasting blood sample.
What does a high HOMA-IR mean?
A high HOMA-IR means your body is producing more insulin than normal to keep glucose in range — a sign of insulin resistance, which is linked to type 2 diabetes, metabolic syndrome, and PCOS. It is a screening signal, not a diagnosis.
Do I need to fast before a HOMA-IR test?
Yes. HOMA-IR requires fasting glucose and fasting insulin, typically after 8–12 hours without food. Non-fasting values make the result invalid because eating raises both glucose and insulin.
Sources
- Matthews DR et al. "Homeostasis model assessment: insulin resistance and β-cell function." Diabetologia. 1985;28:412–419.
- Levy JC et al. "Correct homeostasis model assessment (HOMA) evaluation uses the computer program." Diabetes Care. 1998;21(12):2191–2192.
Last reviewed: June 2025