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Cholesterol Ratio Calculator

Cholesterol ratios are among the most clinically useful measures for assessing cardiovascular disease risk. Rather than looking at individual cholesterol values in isolation, ratios compare protective HDL cholesterol against the lipoproteins that drive plaque formation. The American Heart Association (AHA) and the National Cholesterol Education Program (NCEP ATP III) both recognize cholesterol ratios as meaningful predictors of heart attack and stroke risk — sometimes more informative than total cholesterol alone.

Quick Answer

A healthy Total/HDL cholesterol ratio is below 3.5, and a healthy LDL/HDL ratio is below 2.0 according to AHA guidelines. Lower ratios indicate better cardiovascular health.

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.

Optional — for a more complete assessment

Enter your cholesterol values above to calculate your ratios.

How the Formula Works

  1. Enter your total cholesterol and HDL cholesterol from your most recent lipid panel (required). Add LDL and triglycerides for a more complete assessment (optional).

    All values are in mg/dL

  2. Calculate the Total/HDL ratio by dividing total cholesterol by HDL.

    Total/HDL Ratio = Total Cholesterol ÷ HDL

  3. If LDL is provided, calculate the LDL/HDL ratio.

    LDL/HDL Ratio = LDL ÷ HDL

  4. If triglycerides are provided, calculate the Triglyceride/HDL ratio.

    Triglyceride/HDL Ratio = Triglycerides ÷ HDL

  5. Calculate non-HDL cholesterol to capture all atherogenic lipoproteins.

    Non-HDL Cholesterol = Total Cholesterol − HDL

Methodology & Sources

Reviewed and updated April 5, 2026 · Prepared by GetHealthyCalculators Editorial Team

Ratios are calculated directly from lipid panel values using division. Risk thresholds are derived from the AHA and NCEP ATP III guidelines. The non-HDL cholesterol calculation (Total − HDL) captures all atherogenic lipoproteins including LDL, VLDL, IDL, and Lp(a), which the NCEP ATP III introduced as a secondary treatment target.

References

How to Interpret Your Results

Cholesterol ratios are interpreted using risk bands established by the AHA and NCEP ATP III. The Total/HDL ratio is the most commonly cited — values below 3.5 are ideal, 3.5–5.0 are average, and above 5.0 indicate elevated cardiovascular risk. The LDL/HDL ratio follows similar principles: below 2.0 is ideal, 2.0–3.5 is average, and above 3.5 is high risk. The Triglyceride/HDL ratio is a marker for insulin resistance and metabolic syndrome: below 2.0 is ideal, 2.0–4.0 is borderline, and above 4.0 is high risk.

Ideal Total/HDL Ratio (< 3.5)
0–3.49 — Low cardiovascular risk. Associated with healthy lipid balance.
Average Total/HDL Ratio (3.5–5.0)
3.5–5 — Moderate risk. Lifestyle changes and monitoring recommended.
High Risk Total/HDL Ratio (> 5.0)
5.01–20 — Elevated cardiovascular risk. Consult a healthcare provider.

Limitations

  • Cholesterol ratios are screening tools only and are not diagnostic. They must be interpreted in the context of a complete clinical evaluation including blood pressure, blood glucose, smoking status, and family history.
  • Standard lipid panels measure LDL indirectly using the Friedewald equation, which can be inaccurate when triglycerides are very high (above 400 mg/dL). In these cases, direct LDL testing provides more accurate values.
  • Cholesterol levels naturally fluctuate due to diet, hydration, recent illness, and time of day. A single lipid panel may not reflect your average values — most guidelines recommend fasting values for the most accurate results.
  • These ratios do not account for LDL particle size or number (LDL-P), which research suggests are independent predictors of cardiovascular risk not captured by standard lipid panels.

Frequently Asked Questions

What is a good Total/HDL cholesterol ratio?
According to the AHA and NCEP ATP III, a Total/HDL ratio below 3.5 is considered ideal and associated with low cardiovascular risk. Ratios between 3.5 and 5.0 are average, and ratios above 5.0 indicate elevated risk. The average American has a ratio of approximately 4.4 to 5.0.
Why is the HDL/Total ratio sometimes reported instead?
Some laboratories and health organizations report the HDL/Total ratio (the inverse), where higher values are better. For example, an HDL/Total ratio above 0.24 is generally considered desirable. Our calculator uses the more widely cited Total/HDL format where lower values indicate healthier lipid balance.
What does the Triglyceride/HDL ratio measure?
The Triglyceride/HDL ratio is a surrogate marker for insulin resistance and small, dense LDL particles. Research published by Gaziano et al. in Circulation (1997) found that a Trig/HDL ratio above 4.0 was the strongest predictor of myocardial infarction in their study population — more predictive than total cholesterol alone. A ratio below 2.0 is generally considered ideal.
What is non-HDL cholesterol and why does it matter?
Non-HDL cholesterol equals total cholesterol minus HDL, capturing all atherogenic (plaque-forming) lipoproteins: LDL, VLDL, IDL, and Lp(a). The NCEP ATP III introduced non-HDL as a secondary treatment target because it is more comprehensive than LDL alone, particularly for people with high triglycerides. A non-HDL level below 130 mg/dL is generally considered healthy.
How can I improve my cholesterol ratios?
Improving cholesterol ratios involves raising HDL and/or lowering LDL and triglycerides. Strategies include: regular aerobic exercise (shown to raise HDL), replacing saturated and trans fats with unsaturated fats, increasing soluble fiber intake, reducing refined carbohydrates and added sugars, achieving and maintaining a healthy weight, quitting smoking, and moderating alcohol consumption. Medication (statins, fibrates, niacin) may be appropriate when lifestyle changes are insufficient.
Should I fast before a lipid panel?
Traditional lipid panels require a 9–12 hour fast because triglycerides are significantly affected by recent food intake. Fasting also improves the accuracy of the calculated LDL value. However, the 2016 European Atherosclerosis Society guidelines suggested that non-fasting lipid panels can be used for initial screening since total cholesterol, HDL, and non-HDL cholesterol are less affected by food. Check with your healthcare provider about whether fasting is required.

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