QUICKI Calculator
Calculate the Quantitative Insulin Sensitivity Check Index (QUICKI) from fasting glucose and fasting insulin. QUICKI is a validated alternative to HOMA-IR with better linear discrimination in the normal sensitivity range. Educational reference only.
📉 QUICKI Calculator
QUICKI Result
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QUICKI Reference Ranges
| QUICKI Value | Interpretation |
|---|---|
| > 0.45 | High insulin sensitivity |
| 0.339 – 0.45 | Normal sensitivity range |
| 0.30 – 0.339 | Reduced sensitivity — borderline |
| < 0.30 | Significant insulin resistance |
The 0.339 threshold was identified by Katz et al. (2000) using euglycemic clamp validation. Obese individuals may have values near 0.30; type 2 diabetes patients typically fall below 0.30.
QUICKI Formula
Unlike HOMA-IR, QUICKI uses a logarithmic transformation that linearizes the glucose-insulin relationship, providing better discrimination in the normal and near-normal sensitivity range. Higher QUICKI = better insulin sensitivity (opposite direction to HOMA-IR).
How QUICKI differs from HOMA-IR
QUICKI and HOMA-IR start from the same two fasting numbers — glucose and insulin — but they treat them differently. HOMA-IR multiplies the pair, so its values climb steeply as resistance worsens. QUICKI instead takes the logarithm of each value and inverts the result, which compresses the scale into a narrow band, usually between about 0.30 and 0.45. The practical effect is that QUICKI moves in the opposite direction to HOMA-IR: a lower QUICKI means more insulin resistance, while a higher number reflects better sensitivity.
Because the log transformation softens the extreme readings that can distort HOMA-IR, many researchers find QUICKI tracks more tightly with gold-standard clamp studies, especially in people with obesity or diabetes. If you've seen both scores quoted, they're describing the same physiology from two mathematical angles rather than disagreeing.
Why QUICKI can be more stable across populations
Fasting insulin is a noisy measurement — it varies between lab assays and can swing with a single off day. By taking logarithms, QUICKI dampens that noise, so a modest blip in insulin shifts the score far less than it would shift HOMA-IR. That stability is part of why QUICKI is often chosen for comparing groups in research and for following one person over time.
Reading your QUICKI score in context
As a rough guide, values around 0.45 and above suggest good insulin sensitivity, the mid-0.30s point toward emerging resistance, and figures near 0.30 or below are seen in established insulin resistance and type 2 diabetes. Exact cut-offs differ by study and population, and the index shares HOMA-IR's limits: it needs a proper fast, it reflects one moment in time, and it is a screening estimate, not a diagnosis. Read it together with the rest of your metabolic picture.
Moving your QUICKI in the right direction
Because QUICKI rises as sensitivity improves, the aim is to nudge it upward — and the levers are the familiar ones: steady weight loss if you carry excess fat, regular movement (particularly after meals), resistance training to build glucose-hungry muscle, fewer refined carbohydrates, and consistent sleep. Changes show up over weeks to months, so retest under the same fasting conditions and watch the trend rather than a single reading.
Frequently Asked Questions
What is a normal QUICKI value?
A QUICKI between about 0.339 and 0.45 indicates normal insulin sensitivity. Values of 0.30–0.339 are borderline, and below 0.30 suggests significant insulin resistance. Higher QUICKI means better sensitivity — the opposite direction to HOMA-IR.
How is QUICKI calculated?
QUICKI = 1 ÷ [log₁₀(fasting insulin in µIU/mL) + log₁₀(fasting glucose in mg/dL)]. The logarithms are taken of the same fasting values used for HOMA-IR.
What is the difference between QUICKI and HOMA-IR?
Both use fasting glucose and insulin, but QUICKI applies a logarithmic transformation that discriminates better in the normal sensitivity range. A high HOMA-IR means more resistance, while a high QUICKI means more sensitivity.
Is a higher or lower QUICKI better?
Higher is better. A higher QUICKI value reflects greater insulin sensitivity; a lower value reflects more insulin resistance.
Sources
- Katz A et al. "Quantitative insulin sensitivity check index: a simple, accurate method for assessing insulin sensitivity in humans." J Clin Endocrinol Metab. 2000;85(7):2402–2410.
Last reviewed: June 2025