Your cholesterol panel is usually read as a list of isolated numbers — LDL, HDL, total, triglycerides. But the single most useful line cardiologists actually compare is the ratio between your "bad" LDL and your "good" HDL. This calculator computes that LDL/HDL ratio for you, labels your heart-disease risk category, and shows the supporting total/HDL ratio and non-HDL cholesterol alongside it.
The idea is simple: LDL carries cholesterol into artery walls, while HDL scavenges it back to the liver. A low LDL with a high HDL is protective; a high LDL with a low HDL is far more dangerous than either number on its own. By dividing one by the other you turn two separate readings into a single balance score.
How to Use
- Enter your LDL Cholesterol (bad) in mg/dL — this is the numerator. If your lab report only lists "calculated LDL," use that figure.
- Enter your HDL Cholesterol (good) — this is the denominator and must be above 0. Roughly 25%–30% of your blood cholesterol normally travels with HDL.
- Optionally add your Total Cholesterol. It is used to also compute the total/HDL ratio and your non-HDL cholesterol.
- Read the headline result — the LDL / HDL Ratio — and the risk category beneath it.
Useful reference points for the LDL/HDL ratio:
- Below 1.5 — Ideal, low heart-disease risk.
- 1.5 to 2.49 — Desirable.
- 2.5 to 3.49 — Borderline high.
- 3.5 and above — High heart-disease risk.
The result card also shows your non-HDL cholesterol (total minus HDL), which counts every atherogenic particle and is often a stronger predictor than LDL alone.
Why the Ratio, Not Just LDL?
Two people can have the same LDL of 160 mg/dL but very different risk. Person A with an HDL of 70 has an LDL/HDL ratio of 2.3 — desirable. Person B with an HDL of 35 has a ratio of 4.6 — high risk. Their LDL is identical, but their protective cholesterol is not, and that difference materially shifts cardiovascular outlook.
This is why guidelines increasingly look at the balance between atherogenic and protective particles rather than LDL in isolation. A ratio quietly worsens when HDL drops — say from a sedentary lifestyle, smoking, or low muscle mass — even if your LDL barely moves. Watching the ratio catches that drift early.
For context, the older total/HDL ratio uses the same logic but counts all cholesterol on top: below 5.0 is desirable, 5.0–9.9 is average, and 10.0 or above signals high risk. The LDL/HDL ratio is usually preferred because it isolates the particles that actually drive plaque.
Examples
Example 1 — A typical borderline result. LDL 130, HDL 50, total 200. Your LDL/HDL ratio is 2.6, which falls in the borderline-high band. Your total/HDL ratio is 4.0 (desirable), and your non-HDL cholesterol is 150 mg/dL. The mixed signal — good total ratio but a slipping LDL/HDL balance — is exactly why this calculator shows both.
Example 2 — A protective profile. LDL 80, HDL 80, total 160. The LDL/HDL ratio is 1.0, firmly ideal; total/HDL is 2.0 and non-HDL is 80. Even though LDL is low, the very high HDL is what pushes the ratio into the safest tier.
Example 3 — A high-risk profile. LDL 200, HDL 35, total 280. The LDL/HDL ratio is 5.7, which lands in the high-risk category; total/HDL is 8.0 and non-HDL is 245. Here every measure agrees, and the combination of high LDL plus low HDL is the pattern clinicians treat most aggressively.
FAQ
What is a good LDL to HDL ratio?
An LDL/HDL ratio below 1.5 is considered ideal and signals low heart-disease risk. Between 1.5 and 2.5 is still desirable, 2.5 to 3.5 is borderline high, and 3.5 or above suggests elevated heart-disease risk. The exact target also depends on your age, blood pressure, smoking status, and whether you already have cardiovascular disease.
How is the LDL/HDL ratio calculated?
Divide your LDL cholesterol by your HDL cholesterol. For example, an LDL of 130 divided by an HDL of 50 gives a ratio of 2.6. The calculator also subtracts HDL from total cholesterol to show your non-HDL cholesterol and divides total by HDL for the secondary total/HDL ratio.
Is LDL/HDL better than the total cholesterol ratio?
For many people, yes. The total/HDL ratio counts every cholesterol fraction on top of HDL, while the LDL/HDL ratio isolates the "bad" particles that build plaque against the "good" protective ones. Studies generally find the LDL/HDL ratio to be a slightly stronger predictor of heart events, but both are informative — which is why this page shows them together.
What should my non-HDL cholesterol be?
Non-HDL cholesterol is everything that is not HDL (total minus HDL). For most adults, a non-HDL below 130 mg/dL is desirable, and people at very high cardiovascular risk may be advised to keep it below 100 mg/dL. It is useful because it also captures LDL-rich remnant particles that a bare LDL number misses.
Can I improve my LDL/HDL ratio?
Yes. Lowering LDL and raising HDL both move the ratio in the right direction. Reducing saturated and trans fats, adding soluble fiber, quitting smoking, doing regular aerobic exercise, losing excess weight, and taking statins when prescribed all improve the balance. Even a modest HDL rise of 5–10 mg/dL can meaningfully lower the ratio.
Does the calculator work with mmol/L units?
This calculator expects values in mg/dL, which is standard on U.S. lab reports. If your lab uses mmol/L, multiply your numbers by 38.67 to convert cholesterol to mg/dL before entering them. Because the ratio is a division, converting both LDL and HDL into the same unit gives the same final ratio either way.
Disclaimer
This HDL/LDL ratio calculator is provided for informational purposes only and is not medical advice. It is an educational tool based on a simple division of your own lab values and should not replace professional diagnosis, treatment, or the individualized targets set by your doctor. Cholesterol targets vary with age, family history, blood pressure, diabetes, smoking, and existing heart disease. Always discuss your lipid panel and any changes to medication or lifestyle with a qualified healthcare provider.