Cholesterol ratio calculator

Total cholesterol to HDL reference bands

Ratio bands come from cardiovascular epidemiology, principally the Framingham work that popularized them. Current AHA and ACC and European guidelines base decisions on LDL cholesterol, non-HDL cholesterol and total risk estimation rather than on a ratio, so treat this as context.

• Around 3.5 or below: Under 3.5. The band usually described as desirable in cardiovascular risk literature.
• 3.5 to 5.0: 3.5 to 5.0. Around average for adults in the populations these ratios were derived from. Average is not the same as low risk.
• Above 5.0: Over 5.0. Higher than average, and worth reading together with your ApoB, triglycerides and blood pressure rather than alone.

What each output adds

The total to HDL ratio compresses the atherogenic side and the protective side of your panel into one figure, which is why it predicted events well in early epidemiology. It is a summary, and summaries hide things.

Non-HDL cholesterol, which is simply total minus HDL, is the more useful of these numbers today. It captures every atherogenic particle rather than LDL alone, it needs no fasting sample, and it is recommended as a target in major guidelines. If you look at one thing here, look at that.

• Total to HDL ratio equals total cholesterol divided by HDL cholesterol.
• LDL to HDL ratio equals LDL cholesterol divided by HDL cholesterol.
• Non-HDL cholesterol equals total cholesterol minus HDL cholesterol.

Where ratios mislead

A ratio improves when HDL rises, and that is where the trouble starts. Raising HDL with drugs has repeatedly failed to reduce cardiovascular events in trials, and genetic studies do not support HDL cholesterol as a causal protective factor. So a ratio that looks better because of HDL alone has not necessarily bought you anything.

The reverse also happens. Someone with a very high HDL can post a flattering ratio while carrying a high absolute number of atherogenic particles. That is why measuring ApoB, which counts the particles directly, is the more informative test when there is any doubt.

Reading it with the rest of the panel

The pattern that should prompt a closer look is a high triglyceride level with a low HDL, because that combination usually travels with insulin resistance and with a higher particle count than the LDL number suggests. The triglyceride to HDL ratio is the quicker way to see it.

Lipoprotein(a) is not captured anywhere in these ratios and is not lowered by diet or statins. It is measured once in a lifetime for most people, and it changes how aggressively the rest of the picture is treated.

Where this number is misleading

• Ratios are not treatment targets. Clinical decisions use absolute values plus overall risk estimation.
• A calculated LDL from a standard panel is unreliable when triglycerides are high, so the LDL to HDL ratio inherits that error.
• Very high HDL can flatter the ratio without lowering risk.
• None of these numbers account for lipoprotein(a), family history, blood pressure, smoking or diabetes.
• Nothing here is a prescription or a reason to start or stop medication. That is a conversation with the clinician who has your full history.

Common questions

What is a good cholesterol ratio?

A total to HDL ratio under about 3.5 is usually described as desirable and around 5 as average, based on cardiovascular epidemiology. Current guidelines set targets on LDL and non-HDL cholesterol instead, so a favorable ratio does not override those numbers.

Is non-HDL cholesterol better than a ratio?

Generally yes. Non-HDL cholesterol counts every atherogenic particle type, does not require fasting, and appears as a target in both American and European guidelines, which no ratio does.

Does a good ratio mean I do not need to worry about LDL?

No. A ratio can look fine while the absolute atherogenic particle count is high, particularly in people with a very high HDL. ApoB is the test that settles that question.

Sources and disclosures

• Grundy SM, et al. 2018 AHA/ACC multisociety guideline on the management of blood cholesterol. Circulation, 2019.
• Mach F, et al. 2019 ESC/EAS guidelines for the management of dyslipidaemias. European Heart Journal, 2020.
• Kannel WB, et al. Cholesterol in the prediction of atherosclerotic disease: new perspectives based on the Framingham study. Annals of Internal Medicine, 1979.
• Voight BF, et al. Plasma HDL cholesterol and risk of myocardial infarction: a mendelian randomisation study. Lancet, 2012.
• These calculators are for education. They do not diagnose, they do not replace testing, and they are not a prescription. Baseline is a wellness consultancy, and any prescription is written by an independent licensed provider in our network who has reviewed your history, your goals and any lab work you choose to share.