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LDL/HDL Ratio Calculator

The LDL/HDL ratio is a simple but powerful indicator of atherogenic risk. By comparing the amount of "bad" cholesterol (low-density lipoprotein) to "good" cholesterol (high-density lipoprotein), this ratio captures two major cardiovascular risk signals in a single number. A lower ratio means less cholesterol being deposited in artery walls relative to how much is being cleared. This calculator applies the five-band threshold system derived from American Heart Association and NCEP ATP III guidelines.

Reviewed by GetHealthyCalculators Editorial Team · Updated April 15, 2026

Quick Answer

An LDL/HDL ratio below 2.0 is optimal. Above 5.0 is considered high risk. Divide your LDL (mg/dL) by your HDL (mg/dL) to calculate the ratio.

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.

From your fasting lipid panel (typical range 50–250 mg/dL)

From your fasting lipid panel (typical range 30–100 mg/dL)

Enter your LDL and HDL values from a fasting lipid panel to calculate your ratio.

How the Formula Works

  1. Obtain your fasting lipid panel, noting LDL-C and HDL-C values in mg/dL.

    LDL-C = 130 mg/dL, HDL-C = 55 mg/dL (example)

  2. Divide LDL-C by HDL-C.

    Ratio = LDL-C ÷ HDL-C = 130 ÷ 55 = 2.36

  3. Round to two decimal places for clarity.

    Ratio = 2.36

  4. Classify the ratio using AHA/NCEP thresholds: ≤2.0 optimal, 2.01–3.5 near-optimal, 3.51–5.0 borderline high, 5.01–6.5 high, >6.5 very high.

    2.36 → Near-optimal

Methodology & Sources

Reviewed and updated April 15, 2026 · Prepared by GetHealthyCalculators Editorial Team

This calculator divides fasting LDL-C (mg/dL) by HDL-C (mg/dL). Category thresholds are adapted from the National Cholesterol Education Program (NCEP) Adult Treatment Panel III (ATP III) and American Heart Association risk classification frameworks, which remain foundational reference points in clinical lipidology.

References

Limitations

  • The LDL/HDL ratio is one cardiovascular risk indicator and should be interpreted alongside the full lipid panel, blood pressure, family history, smoking status, and other risk factors.
  • LDL calculated using the Friedewald equation (commonly reported on standard panels) can be inaccurate at very high triglycerides (>400 mg/dL); direct LDL measurement is preferred in that case.
  • HDL quality (function) matters as well as HDL quantity — the ratio does not capture reverse cholesterol transport efficiency.
  • This tool is for informational purposes only and does not constitute a medical diagnosis or treatment recommendation.
  • Thresholds are population-level guidelines. Individual targets should be set in consultation with a healthcare provider based on overall cardiovascular risk.

Frequently Asked Questions

What is a good LDL/HDL ratio?
An LDL/HDL ratio at or below 2.0 is considered optimal. Values between 2.0 and 3.5 are near-optimal and are still associated with low cardiovascular risk in most adults. Values above 5.0 are considered high and warrant a conversation with a clinician.
How is LDL/HDL different from the total cholesterol/HDL ratio?
The total cholesterol/HDL ratio includes LDL, HDL, and VLDL in the numerator. The LDL/HDL ratio isolates the specific "bad" vs "good" balance, which some researchers consider more informative because it removes the contribution of HDL from both sides of the equation. Both ratios are used clinically.
What raises the LDL/HDL ratio?
A high ratio typically reflects either elevated LDL or reduced HDL (or both). Common drivers include a diet high in saturated and trans fats, physical inactivity, obesity, smoking, type 2 diabetes, and genetic hypercholesterolemias. Some medications (e.g., certain beta-blockers, anabolic steroids) can also unfavorably shift lipid ratios.
How can I lower my LDL/HDL ratio?
Strategies that improve the ratio include: reducing saturated and trans fat intake, increasing soluble fiber (oats, legumes, psyllium), regular aerobic exercise (which raises HDL), quitting smoking, achieving a healthy weight, and in some cases, statin therapy. Always discuss pharmaceutical options with your doctor.
Does a good LDL/HDL ratio mean I don't have heart disease risk?
No. A favorable ratio reduces one component of risk but does not eliminate it. Inflammation markers (hsCRP), blood pressure, family history, Lp(a), and glucose metabolism all contribute independently to cardiovascular risk. The ratio is one data point in a fuller picture.
Should I use LDL-C or LDL-P in this calculation?
This calculator uses LDL-C (LDL cholesterol concentration, in mg/dL), which is what standard lipid panels report. LDL-P (LDL particle number) requires a more specialized test (NMR LipoProfile or ion mobility) and is generally considered a more precise atherogenic marker but is not yet part of routine guidelines.
How often should I check my cholesterol?
The AHA generally recommends a fasting lipid panel every 4–6 years for healthy adults 20 and older without cardiovascular risk factors. Adults with risk factors (family history, diabetes, hypertension, obesity) may need more frequent monitoring — your healthcare provider will advise on the right interval for you.

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