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Cholesterol Ratio Calculator

Find your cholesterol ratio and risk level.

How it is calculated

The total-to-HDL cholesterol ratio divides total cholesterol by HDL ("good") cholesterol: ratio = total cholesterol / HDL cholesterol. Both values must be in the same unit, either mg/dL or mmol/L, because the unit cancels out. HDL must be above zero. The tool then labels the ratio using fixed cut-offs: below 3.5 is "Ideal", from 3.5 up to 5 is "Acceptable", and 5 or more is "High risk". The label is shown in English even on the Turkish page. A lower ratio is generally better, since it means more of the cholesterol is carried by HDL. The ratio is only one marker: it does not replace LDL, triglycerides, blood pressure, age and family history, and only a doctor can interpret it for you.

Worked example

A blood test shows total cholesterol of 200 mg/dL and HDL of 50 mg/dL. Divide: 200 / 50 = 4.00. That is between 3.5 and 5, so the status is Acceptable. If HDL were 65 with the same total, the ratio would drop to 3.08, which falls under the Ideal limit of 3.5. If HDL were 35, the ratio would rise to 5.71 and be labelled High risk.

Try this example →

Common mistakes

  • Mixing units, such as total cholesterol in mg/dL and HDL in mmol/L, which gives a ratio about 38 times too large.
  • Entering LDL instead of total cholesterol; the ratio is defined with total.
  • Swapping the two values, which gives a number below 1 that means nothing here.
  • Treating "Acceptable" as a medical all-clear; one ratio does not account for other risk factors.
  • Comparing results from different labs without checking that both measured HDL and total in the same way.

Sources

About this calculator

This calculator divides total cholesterol by HDL ("good") cholesterol to give the total-to-HDL ratio, then compares it against commonly cited risk thresholds — under 5 is generally considered desirable, and under 3.5 is considered optimal by many cardiology guidelines.

It's used by patients trying to make sense of a lab report's raw numbers, since the ratio captures cardiovascular risk more completely than looking at total cholesterol or LDL alone — a high HDL can offset an elevated total number, which the ratio reflects but a single number doesn't. Some references use sex-specific risk levels instead, for example above 5.0 for men and above 4.5 for women; this tool applies one set of cut-offs (3.5 and 5) to everyone.

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Comments (1)

  • Editorial team

    A ratio hides the absolute levels. A total of 300 with HDL 60 and a total of 150 with HDL 30 both give exactly 5.00, yet they describe very different blood profiles. Always read the ratio alongside the individual numbers on your lab report, and let your doctor interpret them together. Which value on your report do you find hardest to make sense of?

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