TyG index calculator
Estimate insulin resistance without an insulin test: the triglyceride-glucose (TyG) index uses two numbers every standard fasting panel already has — fasting triglycerides and fasting glucose. Enter both and you'll get your index instantly, with the commonly used cut-offs explained.
Your privacy: this calculator runs entirely in your browser — nothing you type is sent anywhere. It's the same on-device principle Quanome is built on.
Educational reference only — not medical advice. The TyG index is a research-derived screening estimate; cut-offs vary by study and population, and it is read alongside fasting glucose, HbA1c and your history.
## What your TyG index means
| TyG index | How it's usually read |
| --- | --- |
| Below 8.5 | Generally **reassuring** — a pattern typical of insulin-sensitive people |
| 8.5–9.0 | **Borderline** — the zone where many studies place their cut-off |
| Above 9.0 | **Raised** — associated with insulin resistance; pair with glucose, HbA1c and the trend |
These bands are an orientation, **not** diagnostic thresholds. Published cut-offs range from about 8.5 to 9.0 depending on the population studied and what the study was predicting, and the index was validated against the gold-standard clamp and against HOMA-IR, not as a stand-alone test. The honest use of a single value is as a prompt to look at its two ingredients — [what your fasting glucose means](/blog/what-your-fasting-glucose-means/) and [what high triglycerides mean](/blog/what-high-triglycerides-mean/) — and at the trend across repeat fasting panels.
## The formula
**TyG = ln [ fasting triglycerides (mg/dL) × fasting glucose (mg/dL) ÷ 2 ]**
- *ln* is the natural logarithm — it compresses a product in the thousands into a number around 8–10, which is why small decimal changes matter.
- **mmol/L inputs** are converted first: triglycerides × 88.57 and glucose × 18.02 give mg/dL. The tool does this for you.
- Worked example: triglycerides 100 mg/dL (1.13 mmol/L) and glucose 90 mg/dL (5.0 mmol/L) → ln(4,500) ≈ **8.41**. Triglycerides 150 and glucose 100 → ln(7,500) ≈ **8.92**.
## TyG or HOMA-IR?
Both estimate insulin resistance; they differ in what they need. [HOMA-IR](/tools/homa-ir-calculator/) requires a **fasting insulin** result, which routine panels often skip. TyG needs only the lipid panel and glucose you probably already have — its whole appeal. In many populations the two agree well, and several cohorts found TyG at least as predictive of cardiometabolic outcomes. If you have both inputs, run both and see whether they tell the same story.
## The rest of your metabolic picture
- **Fasting glucose** — the glucose half of the formula: [what your fasting glucose means](/blog/what-your-fasting-glucose-means/).
- **Triglycerides** — the lipid half: [what high triglycerides mean](/blog/what-high-triglycerides-mean/).
- **HOMA-IR** — the insulin-based estimate: [HOMA-IR calculator](/tools/homa-ir-calculator/).
- **HbA1c** — your ~3-month average: [what your HbA1c means](/blog/what-your-hba1c-means/), or the [A1c to average glucose calculator](/tools/a1c-to-average-glucose-calculator/).
- **TG:HDL ratio** — the lipid-side cousin of this index: [cholesterol ratio calculator](/tools/cholesterol-ratio-calculator/).
- Different units? The [mmol/L ↔ mg/dL converter](/tools/mmol-mg-dl-converter/) handles glucose and triglycerides.
## Track your metabolic markers over time — privately
A single TyG value is a snapshot; the value is in the **trend** across fasting panels. [Quanome](/) pulls your labs, Apple Health, and even your DNA into one private timeline on your device — parsed locally, never uploaded — with an AI coach that reads your glucose, lipids and HbA1c together.
Track your metabolic health over time, privately
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