🩺 Free Clinical Tool

HOMA-IR Insulin Resistance
Calculator

Calculate your Homeostatic Model Assessment of Insulin Resistance (HOMA-IR) score using your fasting glucose and fasting insulin lab values. Understand where you stand and how intermittent fasting can help.

🩺 Clinical Tool
Calculate Your HOMA-IR Score
Enter your fasting blood glucose and fasting insulin values from your lab report. HOMA-IR is the gold-standard formula for detecting insulin resistance early — often years before a diabetes diagnosis.
Glucose Unit
mmol/L
mg/dL
From your fasting blood test (8h+ fast)
mmol/L
From your fasting insulin blood test
μIU/mL
Your HOMA-IR Score
—
—
—
Where you fall on the insulin resistance spectrum
Optimal
<1.0 Normal
1.0–1.9 Moderate IR
2.0–2.9 High IR
≥3.0
—
Fasting Glucose
—
Fasting Insulin
—
T2D Risk Level

Personalised Recommendations

📚 Science

What is HOMA-IR?

HOMA-IR (Homeostatic Model Assessment of Insulin Resistance) is the most widely used clinical formula for estimating insulin resistance from a simple fasting blood test. It was developed in 1985 by Matthews et al. and is now used in thousands of research studies and clinical settings worldwide as the primary biomarker for early insulin resistance detection — often years before a type 2 diabetes diagnosis.

HOMA-IR = (Fasting Glucose × Fasting Insulin) ÷ 22.5
When glucose is in mmol/L · Insulin in μIU/mL · Divisor: 22.5
When glucose is in mg/dL · Insulin in μIU/mL · Divisor: 405
<1.0
Optimal
IR Score
1.9
Upper limit
of normal
2.9
Moderate IR
threshold
≥3.0
High insulin
resistance
Important context: HOMA-IR reference ranges vary slightly across populations and laboratories. The thresholds above are based on large population studies. Always interpret your result alongside your doctor, especially if you have other metabolic risk factors. A single HOMA-IR score is most useful when tracked over time to measure the impact of lifestyle interventions like intermittent fasting.
📊 Reference Ranges

HOMA-IR Score Ranges Explained

Understanding what your score means in clinical context allows you to take the right action at the right time — before insulin resistance progresses to pre-diabetes or type 2 diabetes.

✅ Optimal Insulin Sensitivity

HOMA-IR: Below 1.0

Excellent insulin sensitivity. Your cells respond efficiently to insulin signals. Low risk of metabolic disease. Continue current healthy lifestyle and retest annually to maintain this status.

✔️ Normal Range

HOMA-IR: 1.0 – 1.9

Normal insulin sensitivity for most Western adults. Some research suggests scores above 1.5 in metabolically healthy individuals may benefit from lifestyle optimization to remain in the optimal zone.

⚠️ Early Insulin Resistance

HOMA-IR: 2.0 – 2.9

Moderate insulin resistance detected. Your cells are becoming less responsive to insulin. This is a critical window for intervention — lifestyle changes including intermittent fasting, exercise, and diet quality can reverse this score significantly within 8–12 weeks.

🚨 Significant Insulin Resistance

HOMA-IR: 3.0 – 4.9

Significant insulin resistance is present. Risk of pre-diabetes and metabolic syndrome is elevated. Medical consultation is recommended alongside aggressive lifestyle intervention including dietary overhaul, structured exercise, and consistent intermittent fasting.

🔴 Severe Insulin Resistance

HOMA-IR: 5.0 and above

Severe insulin resistance. This level is commonly associated with pre-diabetes, type 2 diabetes, polycystic ovary syndrome (PCOS), and non-alcoholic fatty liver disease (NAFLD). Immediate medical evaluation is essential. Lifestyle interventions remain highly effective even at this level but should be implemented under medical supervision.

Population context: Average HOMA-IR in healthy, lean adults is approximately 1.0–1.5. In overweight or obese individuals without diabetes, scores typically range from 2.0–4.0. In type 2 diabetic patients, scores often exceed 5.0. These averages highlight how common sub-clinical insulin resistance is in modern populations — and why HOMA-IR is such a valuable early warning tool.
🔗 IF Connection

How Intermittent Fasting Improves HOMA-IR

Intermittent fasting is one of the most powerful lifestyle interventions for improving insulin sensitivity and reducing HOMA-IR scores. The mechanism is direct: every hour of fasting allows insulin levels to fall, which progressively restores cellular insulin receptor sensitivity.

📉

Lowers Fasting Insulin

Consistent IF reduces baseline fasting insulin levels by 20–31% over 8–12 weeks, directly lowering the numerator of the HOMA-IR equation.

🍬

Stabilizes Blood Glucose

Fasting periods allow blood glucose to normalize fully between meals, reducing HbA1c and fasting glucose — the denominator of HOMA-IR.

🔬

Restores Receptor Sensitivity

Extended low-insulin periods allow insulin receptors to upregulate their sensitivity — the core mechanism of HOMA-IR improvement through IF.

🏃

Depletes Liver Glycogen

Fasting depletes liver glycogen, reducing hepatic insulin resistance — a key driver of elevated HOMA-IR in metabolic syndrome patients.

🔥

Reduces Visceral Fat

Visceral adipose tissue releases inflammatory cytokines that drive insulin resistance. IF preferentially reduces visceral fat over subcutaneous fat.

📊

Measurable in 8–12 Weeks

Clinical studies show HOMA-IR improvements of 25–40% within 8–12 weeks of consistent 16:8 fasting — detectable in your next blood test.

IF ProtocolExpected HOMA-IR ReductionTimeframeBest For
14:105–12%10–12 weeksMild IR (score 1.5–2.5)
16:815–28%8–10 weeksModerate IR (score 2.0–3.5)
18:625–35%8–12 weeksSignificant IR (score 3.0–5.0)
20:4 / OMAD30–45%6–10 weeksSevere IR (score >4.0), under supervision
Track your progress: Get your fasting glucose and insulin tested before starting intermittent fasting, then retest at 8–12 weeks. This gives you objective evidence of whether your protocol is working and how aggressively to progress. HOMA-IR is the best biomarker for measuring IF success beyond scale weight.
⚕️ This HOMA-IR calculator is for informational purposes only and does not constitute medical advice.
Always consult a qualified healthcare professional before interpreting lab results or making health decisions.
HOMA-IR scores should be reviewed alongside clinical context by your doctor.