Insulin Resistance Calculators
Estimate insulin resistance and sensitivity from fasting lab values using validated indices: HOMA-IR, QUICKI, glucose-to-insulin ratio, and TG:HDL ratio.
🧬 Insulin Resistance & Sensitivity Indices
Estimate insulin resistance directly from fasting glucose and fasting insulin using validated indices.
Insulin Resistance Calculator
Multi-method overview: run HOMA-IR, QUICKI and the glucose-to-insulin ratio side-by-side.
HOMA-IR Calculator
(Fasting glucose × fasting insulin) ÷ 405 — the most widely reported resistance index.
QUICKI Calculator
1 ÷ [log(insulin) + log(glucose)] — a sensitivity index that performs well in lean adults.
Glucose-to-Insulin Ratio
Fasting glucose ÷ fasting insulin — a simple screen; values under 7 suggest resistance.
Insulin Resistance Score
Aggregate metabolic score from HOMA-IR, waist, triglycerides and HDL with an interpretation guide.
❤️ Lipid & Metabolic Risk Markers
Lower-cost surrogate markers from a standard lipid panel and screening questions, useful when an insulin assay is not available.
Triglyceride-to-HDL Ratio
TG ÷ HDL from a routine lipid panel — a low-cost surrogate for insulin resistance and CV risk.
Insulin-to-C-Peptide Ratio
Compare insulin and C-peptide to gauge endogenous versus exogenous insulin.
Type 2 Diabetes Risk
Quick screening score from age, BMI, family history, blood pressure and activity.
🍎 Diet, Glycemic & Ketosis Tools
See how foods drive glucose and insulin demand, and track nutritional ketosis — context for managing insulin sensitivity.
Food Insulin Index & Load
Compare the insulin demand of foods using the food insulin index (FII) and insulin load.
Glycemic Index & Load
Calculate glycemic load from a food's GI and carbs, with low / medium / high bands.
Glucose Ketone Index (GKI)
Track nutritional ketosis from blood glucose and ketones for keto and metabolic goals.
What is insulin resistance?
Insulin resistance means your muscle, liver and fat cells respond poorly to insulin, so the pancreas has to release more insulin than normal to keep blood glucose in range. For years glucose can look fine while insulin levels quietly climb — which is why resistance often goes unnoticed until prediabetes or type 2 diabetes appears. It is also closely linked to metabolic syndrome, fatty liver and polycystic ovary syndrome (PCOS). The calculators above estimate resistance from fasting lab values, so you can put a number to a process that usually has no symptoms.
Insulin resistance indices and thresholds
These indices estimate resistance from fasting lab values without a hyperinsulinemic-euglycemic clamp (the gold-standard research test). They are screening estimates, not diagnoses — read each result alongside your full clinical picture.
Key Formulas
| Index | Resistance Threshold | Notes |
|---|---|---|
| HOMA-IR | > 2.0–2.5 suggests resistance | Most widely used; validated in large populations |
| QUICKI | < 0.339 suggests resistance | Better sensitivity in lean individuals |
| G:I Ratio | < 7 suggests resistance | Useful for hyperinsulinemia screening |
| TG:HDL Ratio | > 3.0 (US) or > 1.3 (mmol/L) | Cardiovascular risk marker; correlates with IR |
Thresholds are guides, not cut-offs. Insulin assays differ between labs and reference ranges vary with age, ethnicity and pregnancy, so a single value should always be read in context by your provider.
Which insulin resistance test should you use?
If you can get a fasting insulin drawn with your fasting glucose, HOMA-IR is the most widely used and easiest to interpret, and QUICKI is a good companion that often reads more sensitively in lean people. The glucose-to-insulin ratio is a quick alternative from the same two values. If insulin testing is not available, the triglyceride-to-HDL ratio from a routine lipid panel is a practical low-cost surrogate. For a broader picture, the insulin resistance score combines several markers, and the type 2 diabetes risk screen needs no bloodwork at all. Whatever you choose, use the same test and the same fasting conditions each time so results stay comparable.
How to improve insulin sensitivity
Insulin resistance responds to the same habits that improve metabolic health, and changes do not have to be dramatic to register. Losing even 5–7% of body weight when needed, walking after meals, building muscle with resistance training, easing back on refined carbohydrates and sugary drinks, and protecting your sleep all help cells respond to insulin again. Improvements typically appear over weeks to months, so retest under identical fasting conditions and track the trend with your provider rather than reacting to any single reading.
Frequently Asked Questions
What is a normal HOMA-IR level?
A HOMA-IR below 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 higher suggests insulin resistance. Thresholds vary by population, age and lab assay, so interpret the result with your provider.
What is the difference between HOMA-IR and QUICKI?
Both estimate insulin resistance from the same fasting glucose and fasting insulin values, but they scale differently. HOMA-IR rises as resistance increases (higher = more resistant), while QUICKI is a logarithmic index that falls as resistance increases (lower = more resistant). QUICKI often discriminates better in lean and normoglycemic people; HOMA-IR is the more widely reported.
Can I test insulin resistance at home?
Not directly. HOMA-IR and QUICKI need a lab fasting glucose and fasting insulin from the same blood draw, which a home glucose meter cannot provide because it does not measure insulin. The triglyceride-to-HDL ratio can be taken from a standard lipid panel and is a useful low-cost surrogate, but a clamp study remains the research gold standard.
What causes insulin resistance?
Insulin resistance develops when muscle, liver and fat cells respond poorly to insulin, so the pancreas secretes more to keep glucose normal. Excess visceral fat, physical inactivity, diets high in refined carbohydrates, poor sleep, chronic stress, certain medications such as steroids, and genetic and hormonal factors (including PCOS) all contribute.
How can I improve insulin sensitivity?
The most effective steps are losing 5–7% of body weight if needed, regular aerobic activity and resistance training, walking after meals, reducing refined carbohydrates and sugary drinks, and protecting sleep. Improvements show up over weeks to months, so retest under the same fasting conditions and use the trend with your provider's input.
Is insulin resistance the same as diabetes?
No. Insulin resistance means the body needs more insulin than normal, but glucose can still be controlled. It is a precursor and risk factor for prediabetes and type 2 diabetes — diabetes is diagnosed only when glucose or A1c crosses defined thresholds. Catching resistance early gives time to act before glucose rises.
Sources
- Matthews DR et al. "Homeostasis model assessment: insulin resistance and beta-cell function." Diabetologia. 1985;28:412–419.
- Katz A et al. "Quantitative insulin sensitivity check index (QUICKI)." J Clin Endocrinol Metab. 2000;85:2402–2410.
Last reviewed: June 2025