Cholesterol Ratio: How to Calculate It and Ideal Targets
Medically reviewed by Dr. Michael Teplitsky, MD Last reviewed 2026-10-15
How to divide total cholesterol by HDL, target benchmarks from Healthline, and why the full lipid panel matters.
The cholesterol ratio is calculated by dividing total cholesterol by high-density lipoprotein (HDL). Healthline, citing StatPearls, recommends keeping this ratio below 5, with 3.5 considered ideal. This guide explains the arithmetic calculation, sex-specific target benchmarks, and why checking low-density lipoprotein (LDL) and non-HDL markers alongside the ratio remains necessary.
The cholesterol ratio is calculated by dividing total cholesterol by high-density lipoprotein (HDL). Healthline, citing StatPearls, says to try to keep the ratio below 5, with 3.5 as the ideal. While this calculated value offers a quick comparison between two numbers, it does not replace a comprehensive lipid evaluation. A ratio provides a mathematical proportion, but it does not replace looking directly at LDL and non-HDL cholesterol. You can review reference ranges in our guide to cholesterol levels.
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You calculate your cholesterol ratio by dividing your total cholesterol score by your high-density lipoprotein (HDL) score. Total cholesterol itself is the sum of your HDL, your low-density lipoprotein (LDL), and 20 percent of your triglyceride measurement. If you want to review how these distinct lipid fractions function in the blood, read our overview of triglycerides vs cholesterol.
Healthline provides a worked example where a total cholesterol of 180 milligrams per deciliter (mg/dL) divided by an HDL of 82 mg/dL yields a ratio of 2.2. The following table displays this published example alongside two additional arithmetic calculations.
| Total Cholesterol (mg/dL) | HDL Cholesterol (mg/dL) | Calculation | Resulting Ratio |
|---|---|---|---|
| 180 | 82 | 180 divided by 82 | 2.2 |
| 200 | 50 | 200 divided by 50 | 4.0 |
| 240 | 80 | 240 divided by 80 | 3.0 |
These rows illustrate the mathematical relationship between the numerator and denominator. An individual with a total cholesterol of 200 mg/dL and an HDL of 50 mg/dL produces a ratio of 4.0. In another mathematical example, a total cholesterol of 240 mg/dL paired with an HDL of 80 mg/dL yields a ratio of 3.0. These calculations reflect arithmetic only and do not constitute a clinical determination of personal health or cardiovascular safety.
Triglycerides Divided by HDL: The TG/HDL Ratio
To calculate the triglyceride-to-HDL (TG/HDL) ratio, divide fasting triglycerides by HDL cholesterol using the same concentration units for both measurements, such as milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L). This calculation yields a completely different number from the standard cholesterol ratio, which divides total cholesterol by HDL cholesterol. The two have different cutoffs; do not apply the 3.5 or 5 targets to it. As an arithmetic illustration, a person with fasting triglycerides of 150 mg/dL and an HDL cholesterol level of 50 mg/dL has a TG/HDL ratio of 3.0.A ratio computed in mg/dL is approximately 2.3 times higher than the same ratio computed in mmol/L, making it necessary to confirm which measurement unit a specific cutoff uses before comparing results. In a 2012 PLoS One study, Mostafa and colleagues evaluated whether TG/HDL tracks insulin resistance, defined as a homeostatic model assessment of insulin resistance (HOMA-IR) at or above 3.08, the 75th percentile of 729 participants from the ADDITION-Leicester screening cohort. That sample included 255 White European men, 250 White European women, 124 South Asian men, and 100 South Asian women.
The study found that higher TG/HDL tertiles were associated with higher fasting insulin and HOMA-IR in White European men, White European women, and South Asian men, but the ratio showed no association with insulin resistance in South Asian women. Optimal cut-points for identifying insulin resistance ranged from 0.9 to 1.7 when lipids were measured in mmol/L, corresponding to 2.0 to 3.8 in mg/dL. The authors described these findings as hypothesis-generating, noting that discrimination across all four demographic groups was modest, with areas under the receiver operating characteristic curve between 0.67 and 0.75. It is a screening hint, not a diagnosis; your clinician interprets it. You can also use an insulin resistance calculator.
What Is a Good Cholesterol Ratio
Healthline, citing StatPearls, says to try to keep the ratio below 5, with 3.5 as the ideal. Healthline notes that ideal targets may differ between men and women. According to that source, men may want to aim for a ratio of 5, while women may want to aim for a ratio of 4. This guidance represents one published perspective from StatPearls and not a universal clinical rule.
When examining the denominator of the ratio, target ranges for HDL also differ by sex and reference source. Healthline notes baseline HDL targets of at least 40 mg/dL for men and at least 50 mg/dL for women. According to MedlinePlus: cholesterol levels, an HDL level of 60 mg/dL or higher is best. MedlinePlus also states that an HDL level under 40 mg/dL is low for men, while a level under 50 mg/dL is low for women.
If a healthcare provider recommends lifestyle adjustments to improve these lipid fractions, you can explore general dietary and physical activity patterns in our guide on how to lower cholesterol. Target ranges serve as general educational benchmarks, and individual goals must be determined with your doctor.
Why the Ratio Is Not the Whole Picture
The ratio is only the proportion between total cholesterol and HDL. The ratio does not replace looking directly at LDL and non-HDL cholesterol. According to MedlinePlus, adult targets for individuals aged 20 and older, across both men and women, include total cholesterol under 200 mg/dL, non-HDL cholesterol under 130 mg/dL, and LDL cholesterol under 100 mg/dL. MedlinePlus does not list or mention a cholesterol ratio in its testing guidance.
Because the ratio is a simple fraction, a high total cholesterol measurement can sit beside a low ratio if the HDL measurement is also high. For example, dividing a total cholesterol of 240 mg/dL by an HDL of 80 mg/dL yields a ratio of 3.0. That 3.0 result falls below the 3.5 ideal benchmark from StatPearls, yet the total cholesterol level of 240 mg/dL remains above the 200 mg/dL target published by MedlinePlus. This scenario is an arithmetic example only, not a demonstration that an elevated total cholesterol level is safe. For a different kind of measurement, see our waist-to-hip ratio calculator. Always share your complete lipid panel with a licensed healthcare provider to assess your overall health profile.
How to test cholesterol and lipids at home
You don't need a lab appointment to check your own cholesterol and lipids — a few at-home kits mail you a collection kit and return physician-reviewed results online within days:
Prefer to order direct? The Everlywell Cholesterol & Lipids Test uses a CLIA-certified lab, physician-reviewed results, and prepaid return shipping.
What Makes a Good Omega-3 Supplement
What counts is the EPA + DHA content, not the total 'fish oil' number — aim for at least 1,000 mg combined EPA/DHA per serving. Triglyceride-form (rTG) fish oil absorbs better than the cheaper ethyl-ester form, and an IFOS freshness certificate tells you it isn't rancid. Algae-based versions work for vegetarians.
Frequently Asked Questions
What is the ideal cholesterol ratio?
Healthline, citing StatPearls, states that the ideal cholesterol ratio is 3.5, with a recommendation to keep the ratio below 5. Suggested targets may differ by sex, with men aiming for 5 and women aiming for 4 according to Healthline. This represents guidance from one published source rather than a universal clinical standard.
What does a cholesterol ratio of 2.7 mean?
A cholesterol ratio of 2.7 means that your total cholesterol number is 2.7 times your HDL number. Arithmetically, 2.7 sits below the 3.5 ideal ratio benchmark cited by Healthline from StatPearls. This calculation does not evaluate your absolute LDL or non-HDL concentrations, which a clinician must review separately.
What if my total cholesterol is high but my ratio is good?
A high total cholesterol can produce a favorable ratio if your HDL level is also high. For instance, a total cholesterol of 240 mg/dL divided by an HDL of 80 mg/dL results in a ratio of 3.0, which sits below the 3.5 ideal target. That calculation is arithmetic only and does not mean the high total cholesterol is safe, as MedlinePlus recommends keeping total cholesterol under 200 mg/dL.
How do I calculate my cholesterol ratio?
To calculate your cholesterol ratio, divide your total cholesterol number by your HDL cholesterol number. For example, Healthline notes that a total cholesterol of 180 mg/dL divided by an HDL of 82 mg/dL results in a ratio of 2.2. Total cholesterol equals your HDL plus your LDL plus 20 percent of your triglyceride measurement.
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