Cholesterol ratio calculator
Turn your lipid panel into the ratios clinicians use to summarise cardiovascular risk: total-cholesterol-to-HDL, LDL-to-HDL, and triglyceride-to-HDL. Enter the numbers you have — total cholesterol and HDL are enough for the main ratio; add LDL and triglycerides for the others.
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. Ratios are one lens on your lipids, read with the individual numbers and your overall risk — not on their own.
## What the ratios mean
| Ratio | Optimal | Moderate | High |
| --- | --- | --- | --- |
| **Total cholesterol : HDL** | < 3.5 | 3.5–5 | ≥ 5 |
| **LDL : HDL** | < 2 | 2–3 | > 3 |
| **Triglyceride : HDL** (mg/dL) | < 2 | 2–4 | > 4 |
The **total:HDL** and **LDL:HDL** ratios are unit-independent — the units cancel, so they read the same in mg/dL or mmol/L. The **triglyceride:HDL** ratio does depend on units (triglycerides and HDL convert differently), so the bands above are for mg/dL; this calculator converts for you when you switch units.
A lower ratio generally reflects a more favourable balance between “bad” and “good” cholesterol. It's a summary, not a target in itself — see [what your cholesterol/HDL ratio means](/blog/what-your-cholesterol-hdl-ratio-means/) for how it's used.
## The rest of your lipid panel
- **LDL** — the usual treatment target. See [what your LDL cholesterol level means](/blog/what-your-ldl-cholesterol-level-means/), or estimate it with our [LDL cholesterol calculator](/tools/ldl-cholesterol-calculator/).
- **HDL** — the “good” cholesterol. See [what your HDL cholesterol level means](/blog/what-your-hdl-cholesterol-level-means/).
- **Triglycerides** — see [what high triglycerides mean](/blog/what-high-triglycerides-mean/).
- **Different units?** Our [mmol/L ↔ mg/dL converter](/tools/mmol-mg-dl-converter/) switches any lipid result between systems.
## Track your lipids over time — privately
A single ratio is a snapshot; the value is in the **trend**. [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 lipid panel in whichever units you use.
Track your cholesterol over time, privately
Quanome unifies your labs, Apple Health, and DNA into one private, on-device timeline — in your units, with an AI coach. Free on the App Store and Google Play.
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