Atherogenic Index of Plasma (AIP) Calculator
Enter fasting triglycerides and HDL cholesterol from your lipid panel. This calculator computes: AIP = log10(TG / HDL) using mmol/L values.
Educational tool only. Not a diagnosis. Always discuss your numbers with a licensed healthcare professional.
What is the atherogenic index?
The atherogenic index of plasma (AIP) is a lipid risk marker based on the relationship between triglycerides and HDL cholesterol. In plain terms, it helps estimate how “atherogenic” (plaque-promoting) your lipid profile may be. A higher index is generally associated with a higher risk of cardiovascular disease.
While LDL cholesterol often gets the spotlight, cardiometabolic risk also depends on particle quality, insulin resistance, inflammation, and other factors. AIP is one way to capture part of that broader picture in a simple formula.
How the calculator works
Formula used
AIP = log10(TG / HDL), where TG and HDL are in mmol/L.
If your lab report is in mg/dL, the calculator automatically converts:
- Triglycerides: mmol/L = mg/dL ÷ 88.57
- HDL-C: mmol/L = mg/dL ÷ 38.67
General interpretation ranges
- Low risk: AIP < 0.11
- Intermediate risk: AIP 0.11 to 0.21
- Higher risk: AIP > 0.21
These cutoffs are commonly used in research and preventive cardiology contexts, but your clinician may interpret values differently depending on your full medical profile.
Why TG and HDL matter together
Triglycerides and HDL often move in opposite directions with metabolic health. Elevated triglycerides combined with low HDL can signal insulin resistance and a higher likelihood of small, dense LDL particles, which are considered more atherogenic.
That’s why a combined marker like AIP can be useful as a quick screening metric, especially when paired with:
- Non-HDL cholesterol
- ApoB (if available)
- Blood pressure and glucose markers
- Family history and lifestyle factors
How to get the most accurate result
Use fasting labs when possible
Triglycerides can rise significantly after meals. If your test was non-fasting, interpretation can still be useful, but fasting values are typically preferred for consistency.
Double-check units
Some lab reports list mg/dL; others use mmol/L. Choosing the correct unit in the calculator prevents major errors.
Track trends over time
One measurement is a snapshot. A series of results over months gives a more meaningful picture of whether your risk profile is improving or worsening.
Ways to improve your atherogenic profile
Improvement usually focuses on lowering triglycerides and raising (or preserving) HDL through sustainable lifestyle changes:
- Reduce refined carbohydrates and added sugar
- Prioritize whole foods, fiber, and lean protein
- Increase physical activity (especially aerobic + resistance training)
- Lose excess visceral fat if overweight
- Limit alcohol if triglycerides are elevated
- Optimize sleep and stress management
- Take prescribed medications consistently when indicated
Important limitations
AIP is useful, but it is not a standalone diagnosis. You can have a “good” AIP and still carry risk from hypertension, smoking, diabetes, chronic kidney disease, inflammation, or strong family history. Likewise, a higher AIP does not automatically mean disease is present.
Best practice is to interpret AIP alongside your complete lipid panel, metabolic markers, and clinical context.
Quick FAQ
Is a negative AIP possible?
Yes. If TG is lower than HDL in mmol/L, the log value can be negative. This is usually considered favorable.
Can this replace medical advice?
No. This tool is educational and should not replace care from your physician, cardiologist, or lipid specialist.
How often should I calculate it?
Typically whenever you get a new lipid panel, especially after lifestyle changes or medication adjustments.