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Cholesterol Ratio Calculator

Table of contents

Total cholesterol, HDL, LDL, and triglyceridesHow to calculate cholesterol ratios?Cholesterol and its consequencesWhat causes high cholesterol?How to lower your cholesterol?FAQs

This cholesterol ratio calculator allows you to perform a quick self-diagnosis. Based on your blood test results, it calculates the most popular cholesterol indicators (LDL/HDL, triglycerides/HDL, and total cholesterol/HDL ratio), making it easy to assess heart disease risks and your general state of health. Read on to learn how to calculate these cholesterol ratios, or, for more of your health needs, take a look at our BMI calculator.

Remember that this calculator is in no case an equivalent of a doctor consultation! If the results are troubling, remember to pay a visit to your physician.

Total cholesterol, HDL, LDL, and triglycerides

Our cholesterol ratio calculator takes into account four basic blood test results. All of the recommended levels are taken from the National Heart, Lung, and Blood Institute within the National Institute of Health.

You only need to input three of your results – they are dependent on each other according to the formula:

total cholesterol = HDL + LDL + 0.2 × triglycerides

  1. Total cholesterol is just an overview of your cholesterol level. It might be misleading, as it combines good and bad cholesterol levels in your blood and does not give sufficient information about heart disease risks.

    • Desirable: Less than 200 mg/dL
    • Borderline high: 200-239 mg/dL
    • High: 240 mg/dL and above
  2. HDL (high-density lipoprotein) is the "good" cholesterol in your blood. Generally speaking, it is a form of cholesterol that is transferred from other parts of your body to the liver in order to metabolize it and remove it from the body with bile acids. That's why this is the only cholesterol type that should be kept high. Women tend to have slightly higher HDL levels than men.

    • Optimal: 60 mg/dL and above
    • Borderline: 40-59 mg/dL
    • Risk of heart disease: Less than 40 mg/dL
  3. LDL (Low-density lipoprotein) is the "bad" cholesterol that accumulates in your arteries and can cause serious medical conditions, such as heart strokes. The lower the LDL level, the better. Remember that if your LDL level is high, you should consult a doctor to investigate risk factors that can lead to heart diseases. Use our LDL calculator to estimate its value based on total cholesterol, HDL, and triglyceride levels.

    • Optimal: Less than 100 mg/dL
    • Near optimal/above optimal: 100-129 mg/dL
    • Borderline high: 130-159 mg/dL
    • High: 160-189 mg/dL
    • Very high: 190 mg/dL and above
  4. Triglycerides are not actually cholesterol but a type of fat transported within your blood. Most of the triglycerides in your body are stored as body fat. Still, high triglyceride levels may be a sign of a lipoprotein problem, as other symptoms such as diabetes often accompany it.

    • Normal: Less than 150 mg/dL
    • Borderline high: 150-199 mg/dL
    • High: 200-499 mg/dL
    • Very high: 500 mg/dL or above

It is also crucial to know that desirable values of different cholesterol fractions may differ regarding the patient and their cardiovascular risk. To reassure yourself about your results, don't hesitate to consult with your doctor!

How to calculate cholesterol ratios?

Three indicators describe your heart disease risk with high accuracy. They are all built as ratios of the aforementioned blood results and are therefore called cholesterol ratios.

Are you wondering what a good cholesterol ratio is? You can use this total cholesterol calculator to find the following values:

  1. LDL/HDL ratio is simply the LDL level divided by the HDL level. LDL/HDL ratio is one of the most popular measures of heart disease risk.

    • Ideal: below 2.0
    • Good: below 5.0
    • Too high: above 5.0
  2. Triglyceride HDL ratio can be calculated by dividing your triglyceride level by HDL level. It's a less popular indicator; nevertheless, it is also used to determine heart stroke risks.

    If you measure the values in mg/dL, the normal range for the triglyceride HDL ratio is:

    • Ideal: 2.0 or less
    • High: 4.0-6.0
    • Too high: 6.0 or above

    For a calculation of this ratio in mmol/L (check the Show the above ratio in mmol/L. checkbox in the calculator), the normal range of the ratio value is different:

    • Ideal: 0.87 or less
    • High: 1.74-2.62
    • Too high: 2.62 or above

    Check out our cholesterol units calculator to fully understand the conversion between mmol/L and mg/dL units.

  3. Total cholesterol HDL (TC HDL) ratio is found by dividing the total cholesterol level by the HDL level. The cholesterol HDL ratio is considered the worst of these three indicators – the American Heart Association does not recommend using it for diagnosis. Still, you can look at this number to get a general idea of your health condition.

    • Ideal: under 3.5
    • Good: under 5.0
    • Bad: over 5

Cholesterol and its consequences

Without cholesterol, the life of humans and animals would not be possible. It is an essential structural component of cell membranes and is needed in the process of production of steroid hormones, bile acids, and vitamin D.

Moreover, you should notice that you can have cholesterol levels that are too low in certain clinical situations, but it is not very often. This condition is called hypocholesterolemia. It is usually caused by hyperthyroidism (excessive production of thyroid hormones), adrenal insufficiency, liver diseases, depression, cerebral hemorrhage, or cancer. In sporadic cases, it is caused by SLOS (Smith–Lemli–Opitz syndrome) – a genetic abnormality in synthesizing cholesterol.

On the other hand, high levels of cholesterol, so-called hypercholesterolemia lead to substantial health problems. The most important consequence of high cholesterol is atherosclerosis. It is a disease in which the inside of an artery narrows due to the accumulation of plaque. At first, patients usually don't have any symptoms, but eventually, it causes:

  • Coronary artery disease (including heart attack);
  • Stroke;
  • Peripheral arteries disease; and
  • Chronic kidney failure.

That is why it is so important to know and regulate your cholesterol levels to minimize the risk of atherosclerosis and its consequences!

What causes high cholesterol?

As mentioned before, high levels of cholesterol may substantially impact our overall life. So it's worth knowing what the causes of high cholesterol are.

Hypercholesterolemia is often caused by thyroid insufficiency, type 2 diabetes, and obesity. It may also be caused by genetic disorders, such as familial hypercholesterolemia, which is not that rare – about 0.3% of the population have mutations causing high LDL-cholesterol!

Nevertheless, the most important factor influencing your lipid and cholesterol levels is your lifestyle! Diet has an impact on cholesterol levels, but the size of its impact differs between individual patients. The results of a meta-analysis Does Dietary Cholesterol Matter? published in 2016 reveal that the intake of high-cholesterol food causes an increase in serum cholesterol levels. Also, trans fatty acids have a strong atherogenic potential – they reduce levels of HDL-cholesterol (good cholesterol) while increasing levels of LDL-cholesterol (the bad one).

If you are in the risk group of hypercholesterolemia, check out blood sugar converter, and start living healthier!

How to lower your cholesterol?

If you are wondering what to do about your cholesterol, follow these rules:

  1. Get regular aerobic physical exercise. It has been proven that regular exercises increase HDL cholesterol (good) and decrease LDL cholesterol (bad). Moreover, it may also lower your risk of heart attack or stroke, as it reduces the blood pressure.

  2. Diet. Eat foods low in fatty acids, saturated fats, and cholesterol. Don't forget to include in your diet fish, as they are a source of omega-3 fatty acids. Consider eating cholesterol-lowering foods, such as plant sterol and stanol margarine, especially instead of cholesterol-containing butter and lard.

  3. Use medications. If the non-pharmacological ways of treatment don't bring satisfactory results, don't hesitate to contact your doctor, who may propose drug therapies. There are numerous drugs that doctors can use to lower your bad cholesterol and correct your LDL HDL ratio. It has been scientifically proven that they not only lower cholesterol but also decrease cardiovascular risk (risk of heart attack, stroke, etc.) and prolong life.

Don't be afraid to make valuable changes in your life. Calculate your LDL HDL ratio and other ratios using our cholesterol ratio calculator. Lower your cholesterol, treat hypertension and diabetes, check for abnormalities in your ECG, protect your heart and live healthier, longer, and happier!


How do I calculate my cholesterol ratio when total cholesterol is 274 mg/dL, and HDL is 61 mg/dL?

To calculate your cholesterol ratio, you have to divide the total cholesterol number by HDL cholesterol.

Total cholesterol = 274 mg/dL.
HDL-cholesterol = 61 mg/dL.
Cholesterol ratio = 274/61 = 4.49.

Your cholesterol ratio is 4.49.

How do I calculate the cholesterol ratio in mmol/L?

To calculate your cholesterol ratio in mmol/L, you just have to make sure both values – total cholesterol and HDL-cholesterol – are in the same units. Then you divide the total cholesterol number by HDL cholesterol level:

Cholesterol ratio in mmol/L = total cholesterol (mmol/L)/HDL-cholesterol (mmol/L)

What are the cholesterol ratios?

There are three cholesterol ratios, which means three indicators of your cardiovascular system's health:

  • LDL HDL ratio – LDL level divided by HDL level;
  • Triglyceride HDL ratio – Triglycerides level divided by HDL level; and
  • Total cholesterol HDL ratio – Total cholesterol (TC) divided by HDL level.

The most popular is the last one – so when you hear somebody referring to just one cholesterol ratio, they probably mean the TC HDL ratio.

Can I have a cholesterol ratio too low?

Yes, you can have a cholesterol ratio that is too low. It is a rare situation, as the majority of people have problems with too much total cholesterol. The ratio can be low due to extremely high HDL levels or low total and LDL cholesterol levels. The situation is caused by thyroid disease, metabolic disorders, or genetic disorders.

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Cholesterol ratios

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