Insulin Sensitivity Estimator

Enter your fasting glucose, fasting insulin, weight, and waist circumference to get your HOMA-IR and QUICKI scores with an insulin sensitivity assessment.

Created by Luis GonzalezLast updated: May 9, 2026

How to Use This Calculator

1
Enter your Fasting Glucose (mg/dL)
Input your fasting blood sugar level, typically from a morning lab test after an 8-12 hour fast. A normal range is generally 70-99 mg/dL.
2
Enter your Fasting Insulin (µIU/mL)
Provide your fasting insulin level, also from a lab test after an 8-12 hour fast. A healthy range is usually between 2-10 µIU/mL.
3
Enter your Weight (lbs)
Input your current body weight in pounds. This helps contextualize overall metabolic health.
4
Enter your Waist Circumference (inches)
Measure your waist at the navel and enter the value in inches. Central obesity is a key indicator of insulin resistance risk.
5
Review your HOMA-IR and QUICKI scores
Examine your calculated scores and their interpretations to understand your insulin resistance status and associated risks.

Example Calculation

A person wants to assess their metabolic health, providing fasting glucose of 95 mg/dL, fasting insulin of 8 µIU/mL, weight of 170 lbs, and a waist circumference of 34 inches.

Fasting Glucose

95 mg/dL

Fasting Insulin

8 µIU/mL

Weight

170 lbs

Waist Circumference

34 inches

Results

1.88

Tips

Re-test Annually for Trends

Insulin sensitivity can change over time due to lifestyle, diet, and age. Re-calculating your scores annually provides valuable trend data, allowing for early intervention if resistance begins to develop.

Focus on Lifestyle Interventions

If scores indicate borderline or significant resistance, prioritize dietary changes (e.g., reducing refined carbohydrates), regular exercise (aim for 150 minutes of moderate activity per week), and weight management. Even a 5-7% body weight reduction can improve sensitivity.

Combine with Other Biomarkers

While HOMA-IR and QUICKI are useful, consider them alongside other markers like HbA1c, triglycerides, and HDL cholesterol for a comprehensive metabolic profile. High triglycerides (above 150 mg/dL) and low HDL (below 40 mg/dL for men, 50 mg/dL for women) are often seen with insulin resistance.

Assessing Your Metabolic Health: Understanding Insulin Sensitivity

This Insulin Sensitivity Estimator provides crucial insights into your metabolic health by calculating your HOMA-IR and QUICKI scores using fasting glucose and insulin levels. Understanding these metrics helps you assess your body's response to insulin, a key hormone regulating blood sugar. With many adults facing a growing risk of insulin resistance, which affects over 30% of the U.S. population in 2025, this tool helps identify early signs and associated risks, including central obesity.

Why Understanding Insulin Sensitivity Matters

Insulin sensitivity is a cornerstone of overall metabolic health; it determines how effectively your body's cells respond to insulin to absorb glucose from the bloodstream. When sensitivity decreases, cells become "resistant," forcing the pancreas to produce more insulin, leading to hyperinsulinemia and eventually elevated blood sugar. This progression is a primary driver of type 2 diabetes, cardiovascular disease, and metabolic syndrome. Recognizing your sensitivity status empowers proactive lifestyle changes to prevent or reverse these serious health conditions.

The Science Behind Insulin Sensitivity Scores

The Insulin Sensitivity Estimator uses two widely accepted indices: HOMA-IR (Homeostatic Model Assessment for Insulin Resistance) and QUICKI (Quantitative Insulin Sensitivity Check Index). Both models leverage your fasting glucose and insulin levels to provide an estimate of your body's insulin resistance.

The HOMA-IR formula is:

HOMA-IR = (Fasting Glucose (mg/dL) × Fasting Insulin (µIU/mL)) / 405

Lower HOMA-IR values indicate better insulin sensitivity.

The QUICKI formula is:

QUICKI = 1 / (log10(Fasting Insulin (µIU/mL)) + log10(Fasting Glucose (mg/dL)))

Higher QUICKI values indicate better insulin sensitivity. These calculations provide a snapshot of your current metabolic state, reflecting your body's ability to manage blood sugar.

💡 Understanding your metabolic risk factors, like insulin resistance, is a crucial step in proactive health management. To gain insight into another lifestyle-related health risk, consider our Sedentary Time Risk Calculator.

Worked Example: Evaluating Metabolic Markers

Consider an individual who has obtained recent lab results and wants to understand their insulin sensitivity:

Fasting Glucose: 95 mg/dL
Fasting Insulin: 8 µIU/mL
Weight: 170 lbs
Waist Circumference: 34 inches

Calculate HOMA-IR Score: HOMA-IR = (95 × 8) / 405 HOMA-IR = 760 / 405 HOMA-IR = 1.88
Determine Insulin Status: A HOMA-IR of 1.88 falls below 2.0, indicating normal sensitivity.
Calculate QUICKI Index: QUICKI = 1 / (log10(8) + log10(95)) QUICKI = 1 / (0.903 + 1.978) QUICKI = 1 / 2.881 QUICKI = 0.347
Assess QUICKI Interpretation: A QUICKI of 0.347 is between 0.339 and 0.382, suggesting borderline sensitivity.
Evaluate Waist Circumference Risk: At 34 inches, this is within the normal range for men (<40 in) and women (<35 in), indicating lower central obesity risk.

The primary calculated result is a HOMA-IR Score of 1.88.

💡 Just as these scores help evaluate internal health, other tools assess external health risks. For a different type of health assessment, check out the Sepsis qSOFA Score Calculator.

Understanding Your Metabolic Health Markers

Assessing metabolic health involves more than just a single number; it requires interpreting various markers in context. Fasting glucose levels are a direct measure of blood sugar control, with values above 100 mg/dL often indicating pre-diabetes and above 126 mg/dL signaling diabetes, according to American Diabetes Association (ADA) guidelines. Fasting insulin, while not a diagnostic criterion, helps reveal the pancreas's effort to maintain glucose. A consistently high fasting insulin (e.g., >10 µIU/mL) even with normal glucose suggests significant insulin resistance. Waist circumference is a practical, non-invasive indicator of visceral fat, a key driver of metabolic dysfunction. For men, a waist over 40 inches (102 cm) and for women, over 35 inches (88 cm), significantly increases risk for cardiovascular disease, type 2 diabetes, and certain cancers, even if BMI is within a healthy range.

Limitations of Insulin Sensitivity Estimates

While the HOMA-IR and QUICKI scores are valuable screening tools, it's crucial to understand their limitations. These models are estimations based on fasting values and may not fully capture the dynamic nature of insulin sensitivity throughout the day or in response to meals. Factors such as acute illness, stress, certain medications (e.g., corticosteroids), and even significant liver disease can temporarily skew results, leading to misleading interpretations. Additionally, these calculators do not account for individual variations in insulin secretion capacity from the pancreas, which can impact how the body compensates for resistance. They are also not diagnostic for specific conditions like Type 1 diabetes or monogenic forms of diabetes. Therefore, these scores should always be interpreted by a healthcare professional in conjunction with a full medical history, physical examination, and other relevant laboratory tests to provide a comprehensive metabolic assessment.

Frequently Asked Questions

What is HOMA-IR and what does it indicate about insulin sensitivity?

HOMA-IR (Homeostatic Model Assessment for Insulin Resistance) is a widely used index that estimates insulin resistance based on fasting glucose and insulin levels. A HOMA-IR score below 2.0 generally indicates good insulin sensitivity, while scores between 2.0-2.9 suggest borderline resistance, and scores above 2.9 are indicative of significant insulin resistance, signaling an increased risk for type 2 diabetes and metabolic syndrome.

How does the QUICKI Index differ from HOMA-IR?

The QUICKI (Quantitative Insulin Sensitivity Check Index) is another measure of insulin sensitivity, but it uses a logarithmic transformation of fasting glucose and insulin levels. Unlike HOMA-IR, where lower scores are better, a higher QUICKI value indicates better insulin sensitivity. A QUICKI score greater than or equal to 0.382 typically signifies normal sensitivity, while values below 0.339 suggest insulin resistance.

Why is waist circumference included in an insulin sensitivity assessment?

Waist circumference is a crucial indicator because central obesity, or excess fat around the abdomen, is strongly linked to insulin resistance and metabolic dysfunction. Visceral fat, which surrounds internal organs, is metabolically active and releases inflammatory substances that can impair insulin signaling. A waist circumference greater than 40 inches for men or 35 inches for women significantly increases the risk for insulin resistance and related health problems.