QUICKI Calculator

Q: What is QUICKI and why does it matter?

QUICKI (Quantitative Insulin Sensitivity Check Index) is a math-derived measure of how effectively your body responds to insulin. Poor insulin sensitivity — insulin resistance — is a central feature of prediabetes, type 2 diabetes, metabolic syndrome, and PCOS. QUICKI gives you a snapshot of your metabolic health from a single fasting blood draw.

Q: What is a normal QUICKI score?

Based on the original Katz 2000 validation study, QUICKI values above 0.357 are typical of lean, healthy adults. Values between 0.331 and 0.357 fall in the normal range. Overweight individuals tend to score between 0.304 and 0.331 (reduced sensitivity), and people with type 2 diabetes often score below 0.304 (insulin resistant).

Q: How is QUICKI different from HOMA-IR?

Both use fasting insulin and glucose. HOMA-IR (Homeostatic Model Assessment) calculates insulin resistance as (glucose × insulin) / 405 — a higher score means more resistance. QUICKI uses log-transformed values to produce a sensitivity score — a higher QUICKI means better sensitivity. HOMA-IR tends to be more widely used in research and clinical practice, but QUICKI has superior linear correlation with the euglycemic clamp in several validation studies.

Q: What fasting insulin level is considered normal?

Most laboratories report a fasting insulin reference range of approximately 2–25 µU/mL, but optimal ranges used in functional medicine are often more conservative (below 7–10 µU/mL). A high fasting insulin in the context of normal glucose often precedes the rise in glucose seen in prediabetes, making it an early warning signal.

Q: Can lifestyle changes improve QUICKI?

Yes. Insulin sensitivity responds to lifestyle interventions. Consistent aerobic exercise and resistance training, reduced refined carbohydrate intake, calorie restriction leading to weight loss (if indicated), improved sleep quality, and stress management are all associated with improved insulin sensitivity in clinical trials.

Q: Do I need a special lab test to calculate QUICKI?

You need a fasting insulin level in addition to a standard fasting glucose. Fasting glucose is part of a basic metabolic panel, but fasting insulin is not routinely included — you may need to request it specifically. Some functional medicine providers and metabolic health clinics include fasting insulin as standard.

Q: Is QUICKI appropriate for children?

QUICKI has been studied in pediatric populations and shows reasonable correlation with clamp-measured sensitivity, but the established threshold values are based primarily on adult data. Pediatric insulin resistance assessment is best done with guidance from a pediatric endocrinologist using age- and sex-appropriate reference ranges.

The Quantitative Insulin Sensitivity Check Index (QUICKI) is a simple, validated index of insulin sensitivity derived from a single fasting blood draw. Published by Katz et al. in 2000, QUICKI correlates well with the gold-standard hyperinsulinemic-euglycemic clamp technique and is practical for clinical and research use. It uses the logarithm of fasting insulin and fasting glucose to produce a dimensionless score: higher values mean better insulin sensitivity. This calculator computes your QUICKI and places it in one of four clinically recognized categories.

Reviewed by GetHealthyCalculators Editorial Team · Updated April 15, 2026

Quick Answer

QUICKI = 1 ÷ (log₁₀(fasting insulin µU/mL) + log₁₀(fasting glucose mg/dL)). A score above 0.357 suggests high insulin sensitivity; below 0.304 suggests insulin resistance.

These results are estimates based on general formulas and are not a substitute for professional medical advice. Consult a healthcare provider before making health decisions.

How the Formula Works

Obtain your fasting plasma insulin in µU/mL (microunits per milliliter) and fasting plasma glucose in mg/dL from a lab panel.
Insulin = 10 µU/mL, Glucose = 95 mg/dL (example)
Take the base-10 logarithm of each value.
log₁₀(10) = 1.000 | log₁₀(95) = 1.978
Sum the two logarithms.
1.000 + 1.978 = 2.978
Take the reciprocal (1 divided by the sum).
QUICKI = 1 ÷ 2.978 = 0.336
Classify: >0.357 highly sensitive, 0.331–0.357 normal, 0.304–0.330 reduced, <0.304 insulin resistant.
0.336 → Normal sensitivity

Methodology & Sources

Reviewed and updated April 15, 2026 · Prepared by GetHealthyCalculators Editorial Team

QUICKI was introduced by Katz A et al. in the Journal of Clinical Endocrinology & Metabolism (2000, 85:2402–2410). The formula is QUICKI = 1 / (log₁₀[I₀] + log₁₀[G₀]), where I₀ is fasting insulin in µU/mL and G₀ is fasting glucose in mg/dL. The authors validated QUICKI against the hyperinsulinemic-euglycemic clamp in lean individuals, obese individuals, and patients with type 2 diabetes, finding strong linear correlation (r ≈ 0.79). It has since been validated in multiple independent cohorts as a simple surrogate for insulin sensitivity.

References

Quantitative Insulin Sensitivity Check Index: A Simple, Accurate Method for Assessing Insulin Sensitivity in Humans · Katz A et al., J Clin Endocrinol Metab, 2000
Insulin Resistance — Overview and Measurement Methods · Matthews DR et al., Diabetologia, 1985 (HOMA-IR reference)
Homeostatic Model Assessment: Insulin Resistance and Beta-Cell Function from Fasting Plasma Insulin and Glucose Concentrations · National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Comparison of QUICKI and HOMA-IR in Detecting Insulin Resistance · Uwaifo GI et al., J Clin Endocrinol Metab, 2004

Limitations

QUICKI is a surrogate marker, not a direct measurement of insulin sensitivity. The gold standard remains the hyperinsulinemic-euglycemic clamp, which is impractical outside research settings.
The formula requires a fasting sample — non-fasting values will produce an inaccurate QUICKI.
QUICKI thresholds were established primarily in White and African American adult populations in the original validation study; applicability across all ethnicities may vary.
Factors that alter insulin assay results — such as hemolysis, sample handling, or immunoassay cross-reactivity — can affect QUICKI accuracy.
This tool is for informational and educational purposes only. QUICKI should be interpreted by a healthcare provider alongside a full metabolic panel and clinical context.

Frequently Asked Questions

What is QUICKI and why does it matter?

QUICKI (Quantitative Insulin Sensitivity Check Index) is a math-derived measure of how effectively your body responds to insulin. Poor insulin sensitivity — insulin resistance — is a central feature of prediabetes, type 2 diabetes, metabolic syndrome, and PCOS. QUICKI gives you a snapshot of your metabolic health from a single fasting blood draw.

What is a normal QUICKI score?

Based on the original Katz 2000 validation study, QUICKI values above 0.357 are typical of lean, healthy adults. Values between 0.331 and 0.357 fall in the normal range. Overweight individuals tend to score between 0.304 and 0.331 (reduced sensitivity), and people with type 2 diabetes often score below 0.304 (insulin resistant).

How is QUICKI different from HOMA-IR?

Both use fasting insulin and glucose. HOMA-IR (Homeostatic Model Assessment) calculates insulin resistance as (glucose × insulin) / 405 — a higher score means more resistance. QUICKI uses log-transformed values to produce a sensitivity score — a higher QUICKI means better sensitivity. HOMA-IR tends to be more widely used in research and clinical practice, but QUICKI has superior linear correlation with the euglycemic clamp in several validation studies.

What fasting insulin level is considered normal?

Most laboratories report a fasting insulin reference range of approximately 2–25 µU/mL, but optimal ranges used in functional medicine are often more conservative (below 7–10 µU/mL). A high fasting insulin in the context of normal glucose often precedes the rise in glucose seen in prediabetes, making it an early warning signal.

Can lifestyle changes improve QUICKI?

Yes. Insulin sensitivity responds to lifestyle interventions. Consistent aerobic exercise and resistance training, reduced refined carbohydrate intake, calorie restriction leading to weight loss (if indicated), improved sleep quality, and stress management are all associated with improved insulin sensitivity in clinical trials.

Do I need a special lab test to calculate QUICKI?

You need a fasting insulin level in addition to a standard fasting glucose. Fasting glucose is part of a basic metabolic panel, but fasting insulin is not routinely included — you may need to request it specifically. Some functional medicine providers and metabolic health clinics include fasting insulin as standard.

Is QUICKI appropriate for children?

QUICKI has been studied in pediatric populations and shows reasonable correlation with clamp-measured sensitivity, but the established threshold values are based primarily on adult data. Pediatric insulin resistance assessment is best done with guidance from a pediatric endocrinologist using age- and sex-appropriate reference ranges.

Also calculate your HOMA-IR to cross-check insulin resistance from a different angle

HOMA-IR Calculator

QUICKI Calculator

How the Formula Works

Methodology & Sources

References

Limitations

Frequently Asked Questions

Related Calculators

HOMA-IR Calculator

Diabetes Risk Calculator

A1C Calculator

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