HOMA-IR Calculator
The Homeostatic Model Assessment of Insulin Resistance (HOMA-IR) is an internationally recognized clinical tool used to quantify insulin resistance and beta-cell function. By comparing your fasting blood glucose and fasting insulin levels, this calculator can help detect early signs of metabolic syndrome, prediabetes, or Type 2 Diabetes.
Live HOMA-IR Calculator
Formulas Used in This Calculator
The calculation of HOMA-IR relies on the inverse relationship between fasting glucose and fasting insulin. Depending on the measurement units utilized by your laboratory, there are two primary formulas:
HOMA-IR = (Glucose [mg/dL] × Insulin [mIU/L]) / 405
Standard SI (Metric) Formula:
HOMA-IR = (Glucose [mmol/L] × Insulin [mIU/L]) / 22.5
How to Use the Calculator & Unit Converter
1. Inputting Your Lab Results
To use this tool, you need blood work drawn while in a fasted state (typically 8-12 hours without food). Locate your Fasting Glucose and Fasting Insulin levels on your lab report and type them into the respective boxes above. The calculator will instantly update the result—no page reloads required.
2. Using the Live Unit Converter
Because laboratories worldwide use vastly different units, we have built-in over 9 unit conversions to prevent complex manual math:
- Glucose Units: You can select mg/dL (standard in the US), mmol/L (standard in the UK, Canada, and Europe), mg/L, or g/L.
- Insulin Units: Toggle between mIU/L, µU/mL (which is mathematically identical to mIU/L), standard SI pmol/L, mU/L, or U/L.
- Output Formats: By default, the output is a standard index number. However, you can toggle it to a percentage format, comparing your score to an ideal baseline score of 1.0 (100%).
Step-by-Step Mathematical Examples
Want to calculate your HOMA-IR manually? Here are two examples showing exactly how the mathematical formulas are applied in clinical practice.
Example 1: US Standard Units (mg/dL)
Patient Labs: Fasting Glucose = 95 mg/dL | Fasting Insulin = 12 mIU/L
Math: (95 × 12) = 1,140
Formula: 1,140 ÷ 405 = 2.81 (Indicates early insulin resistance)
Example 2: International Metric Units (mmol/L)
Patient Labs: Fasting Glucose = 5.2 mmol/L | Fasting Insulin = 8 µU/mL
Math: (5.2 × 8) = 41.6
Formula: 41.6 ÷ 22.5 = 1.84 (Indicates normal insulin sensitivity)
Clinical Interpretation of HOMA-IR Scores
While definitive ranges can vary slightly between different epidemiological studies and populations, the medical community generally accepts the following thresholds for assessing insulin resistance:
- Under 1.0 (Optimal): You have excellent, highly sensitive insulin function. Your body requires very little insulin to manage your blood sugar.
- 1.0 to 1.9 (Normal): Your insulin sensitivity is within a healthy, normal range.
- 1.9 to 2.9 (Early Insulin Resistance): Your cells are beginning to resist the signal of insulin. Your pancreas is pumping out more insulin to keep your blood sugar normal. This is an excellent time for dietary and lifestyle interventions.
- Above 2.9 (Significant Insulin Resistance): This indicates substantial insulin resistance and is highly correlated with Metabolic Syndrome, Polycystic Ovary Syndrome (PCOS), and an increased risk of developing Type 2 Diabetes.
Note: HOMA-IR is most accurate for individuals with healthy beta-cell function. It may not be accurate in patients with advanced Type 2 Diabetes who have beta-cell failure, or in those taking exogenous insulin.
