🫀 Cholesterol Ratio Calculator: Total to HDL and LDL to HDL
By Shihab Mia · Updated 2026-06-30
This cholesterol ratio calculator is for general education only and is not a diagnosis or medical advice. A cholesterol ratio is just one piece of a much bigger picture that also includes blood pressure, blood sugar, smoking, family history, age and validated risk scores. Reference bands vary between guidelines and laboratories. Always discuss your full lipid panel and your personal risk with a qualified doctor before changing your diet, lifestyle or medication.
Enter the figures from your lipid panel in mg/dL. HDL is the "good" cholesterol, so a lower ratio is better.
To calculate your cholesterol ratio, divide your total cholesterol by your HDL cholesterol. For example, a total of 200 mg/dL with an HDL of 50 mg/dL gives a total-to-HDL cholesterol ratio of 4.0. Because HDL is the "good" cholesterol that helps clear your arteries, a lower ratio is better, and most clinicians treat a total-to-HDL ratio under 5.0 as acceptable and under 3.5 as optimal. Enter your total cholesterol, HDL and (optionally) LDL into this cholesterol ratio calculator and it instantly returns your total-to-HDL and LDL-to-HDL ratios with a clear risk band so you can see where you stand.
What is the Cholesterol Ratio Calculator?
The total cholesterol to HDL ratio is found by dividing your total cholesterol by your HDL cholesterol. A total of 200 mg/dL with an HDL of 50 mg/dL gives a ratio of 4.0; a total of 240 mg/dL with an HDL of 40 mg/dL gives 6.0. Because HDL helps remove cholesterol from the bloodstream, raising HDL or lowering total cholesterol both push the ratio down, and a lower ratio is associated with lower cardiovascular risk. This cholesterol ratio calculator runs that division for you and then maps the result onto a familiar set of bands so the number means something at a glance.
The LDL to HDL ratio is a second view that sets the bad cholesterol (LDL, which can build up inside artery walls) directly against the protective HDL. It is calculated as LDL divided by HDL. Some researchers argue this ratio tracks risk more directly than the total-to-HDL ratio because it isolates the two opposing players, though in practice both ratios tend to move together. A value under 2.0 is often described as optimal and under 3.5 as reasonable. Entering your LDL into the cholesterol ratio calculator gives you this second number alongside the first.
A cholesterol ratio is useful precisely because it is relative. Two people can both have a total cholesterol of 240 mg/dL, but the one with an HDL of 80 has a far healthier ratio (3.0) than the one with an HDL of 35 (6.9). This is why a single total cholesterol number can be misleading on its own, and why the ratio became popular as a quick summary. The cholesterol ratio calculator makes that comparison obvious: change one input and watch the ratio and band move.
Units matter, but in a reassuring way. This tool expects mg/dL, the standard unit in the United States. If your lab reports in mmol/L, as is common in the UK, Canada, Australia and much of Europe, the ratio itself comes out to the same number because the unit cancels out during division, as long as all your values use the same unit. So a UK reader can enter mmol/L values and still read a valid total-to-HDL ratio, even though the individual mg/dL bands in the reference tables below would need converting (multiply mmol/L by 38.67 for cholesterol).
Where a cholesterol ratio falls short is as a stand-alone verdict. Modern guidelines increasingly focus on the absolute LDL number, on non-HDL cholesterol (total minus HDL, which captures every harmful particle in one figure), and on overall risk calculators that weigh age, blood pressure, smoking and diabetes. The Mayo Clinic notes that non-HDL cholesterol may predict risk better than the ratio for many people. Treat the output of this cholesterol ratio calculator as a helpful signal that prompts a conversation with your doctor, not as a diagnosis. A good ratio does not rule out risk, and a high ratio does not guarantee disease.
When to use it
- Turning the numbers on a lipid panel into a single, easy-to-track cholesterol ratio between checkups.
- Seeing how raising HDL through exercise, or lowering LDL through diet, would change your total-to-HDL ratio.
- Comparing two results over time to check whether a lifestyle change is moving your ratio in the right direction.
- Preparing questions before a doctor visit so you understand what your total-to-HDL and LDL-to-HDL ratios mean.
- Helping a family member make sense of a confusing lab report without waiting for the next appointment.
- Quickly checking whether a high total cholesterol is offset by a high, protective HDL.
How to use the Cholesterol Ratio Calculator
- Find your total cholesterol, HDL and LDL on your most recent lab report (the lipid panel).
- Enter your total cholesterol in mg/dL.
- Enter your HDL (good) cholesterol in mg/dL.
- Optionally enter your LDL (bad) cholesterol to also see the LDL-to-HDL ratio.
- Read off the total-to-HDL ratio, the LDL-to-HDL ratio and the general risk band the calculator returns.
Formula & method
Worked examples
Total cholesterol 200 mg/dL, HDL 50 mg/dL, LDL 120 mg/dL.
- Total : HDL = 200 / 50 = 4.0
- LDL : HDL = 120 / 50 = 2.4
- Non-HDL = 200 minus 50 = 150 mg/dL
- A total-to-HDL of 4.0 sits in the good band (under 5.0)
- An LDL-to-HDL of 2.4 sits in the good band (under 3.5)
Result: Total:HDL = 4.0 (good), LDL:HDL = 2.4 (good)
Total cholesterol 260 mg/dL, HDL 40 mg/dL, LDL 180 mg/dL.
- Total : HDL = 260 / 40 = 6.5
- LDL : HDL = 180 / 40 = 4.5
- Non-HDL = 260 minus 40 = 220 mg/dL
- A total-to-HDL of 6.5 falls in the high band (6.0 or above)
- An LDL-to-HDL of 4.5 falls in the moderate band
Result: Total:HDL = 6.5 (high), LDL:HDL = 4.5 (moderate)
High total but high HDL: total 240 mg/dL, HDL 80 mg/dL.
- Total : HDL = 240 / 80 = 3.0
- Non-HDL = 240 minus 80 = 160 mg/dL
- Even though total cholesterol is high, the strong HDL pulls the ratio to 3.0
- A total-to-HDL of 3.0 sits in the optimal band (under 3.5)
Result: Total:HDL = 3.0 (optimal), despite a high total cholesterol
General total cholesterol to HDL ratio bands (lower is better)
| Total : HDL ratio | General band |
|---|---|
| Under 3.5 | Optimal |
| 3.5 to under 5.0 | Good |
| 5.0 to under 6.0 | Moderate |
| 6.0 or above | High |
General LDL to HDL ratio bands (lower is better)
| LDL : HDL ratio | General band |
|---|---|
| Under 2.0 | Optimal |
| 2.0 to under 3.5 | Good |
| 3.5 to under 5.0 | Moderate |
| 5.0 or above | High |
Typical target lipid values for adults (mg/dL, guideline based)
| Measure | Desirable target |
|---|---|
| Total cholesterol | Under 200 |
| LDL (bad) | Under 100 |
| HDL (good) | 40 or higher for men, 50 or higher for women |
| Non-HDL cholesterol | Under 130 |
| Triglycerides | Under 150 |
Common mistakes to avoid
- Thinking a higher ratio is better. It is the opposite. HDL is protective, so it sits on the bottom of the division. A higher cholesterol ratio means more total or LDL cholesterol relative to your good cholesterol, which points to higher risk, not lower.
- Mixing up mg/dL and mmol/L units. This tool expects mg/dL, the unit common in the United States. If your lab reports mmol/L, the ratio is the same number because the unit cancels out, but every value you enter must use the same unit. To convert a single cholesterol value, multiply mmol/L by 38.67 to get mg/dL.
- Judging heart health on the ratio alone. A good ratio does not rule out risk, and a high one does not guarantee disease. Age, blood pressure, smoking, diabetes, family history and the absolute LDL and non-HDL levels all matter. Modern guidelines use full risk calculators, not a single cholesterol ratio.
- Using a non-fasting sample without knowing it. Triglycerides and the calculated LDL can be skewed by a recent meal. If your test was not fasting, the LDL figure (and therefore the LDL-to-HDL ratio) may be less reliable, so check with your provider before reading too much into it.
- Ignoring non-HDL cholesterol. Non-HDL cholesterol (total minus HDL) captures every harmful particle in one number and does not need a fasting sample. Many clinicians now see it as more informative than the ratio, so do not let a comforting ratio distract from a high non-HDL value.
- Comparing your ratio to someone else of a different sex. Women tend to have higher HDL than men, so healthy HDL targets differ (about 50 mg/dL or higher for women versus 40 for men). Compare your ratio to your own past results rather than to a friend.
Glossary
- Total cholesterol
- The combined amount of all cholesterol in your blood, including HDL, LDL and a portion estimated from triglycerides.
- HDL
- High-density lipoprotein, the "good" cholesterol that helps carry cholesterol out of the arteries and back to the liver.
- LDL
- Low-density lipoprotein, the "bad" cholesterol that can build up in artery walls and narrow them over time.
- Cholesterol ratio
- Total cholesterol divided by HDL, a single number summarising the balance between total and protective cholesterol.
- LDL to HDL ratio
- LDL divided by HDL, which sets the bad cholesterol directly against the good cholesterol.
- Non-HDL cholesterol
- Total cholesterol minus HDL, a single figure that captures all the potentially harmful cholesterol particles.
- Lipid panel
- A blood test that reports total cholesterol, HDL, LDL and triglycerides, the source of the numbers used here.
- Triglycerides
- A type of fat in the blood; high levels often accompany low HDL and can affect the calculated LDL.
Frequently asked questions
How do I calculate my cholesterol ratio?
Divide your total cholesterol by your HDL cholesterol. For example, a total of 200 mg/dL divided by an HDL of 50 mg/dL gives a cholesterol ratio of 4.0. This calculator does the division for you and also computes the LDL-to-HDL ratio if you enter your LDL.
What is a good cholesterol ratio?
For the total-to-HDL cholesterol ratio, most clinicians consider under 5.0 acceptable and under 3.5 optimal. Lower is better, because a low ratio means you have more protective HDL relative to your total cholesterol. For the LDL-to-HDL ratio, under 2.0 is often considered optimal.
What cholesterol ratio is too high?
A total-to-HDL cholesterol ratio of 5.0 or above is generally considered moderate to high risk, and 6.0 or above is high. An LDL-to-HDL ratio of 3.5 or above is moderate and 5.0 or above is high. A high ratio is a prompt to review your full lipid panel and overall risk with a doctor, not a diagnosis on its own.
Is the total-to-HDL or LDL-to-HDL ratio more useful?
Both move in the same direction and both are useful. The total-to-HDL ratio is the most commonly quoted, while some researchers feel the LDL-to-HDL ratio tracks risk a little more directly because it sets the bad cholesterol against the good. Your doctor will look at both alongside the absolute numbers and your non-HDL cholesterol.
Why is a lower cholesterol ratio better?
HDL is the divisor in the ratio and it helps clear cholesterol from your arteries. More HDL, or less total and LDL cholesterol, pushes the ratio down. A lower cholesterol ratio is linked to lower cardiovascular risk in population studies.
How can I improve my cholesterol ratio?
Often you can. Regular exercise, losing excess weight, quitting smoking and choosing unsaturated fats over saturated and trans fats tend to raise HDL and lower LDL, which improves the ratio. Some people also need medication such as a statin. Any plan should be agreed with your doctor.
Does the cholesterol ratio work the same in mmol/L?
Yes. The ratio is the same number whether you use mg/dL or mmol/L, because the units cancel out during division, as long as all your values use the same unit. The mg/dL bands in the tables above would need converting (multiply mmol/L by 38.67) before you compare individual values.
What is non-HDL cholesterol and is it better than the ratio?
Non-HDL cholesterol is your total cholesterol minus your HDL, so it sums up all the potentially harmful particles in one figure. The Mayo Clinic notes it may predict risk better than the ratio for many people, and it does not require a fasting sample. It is best used alongside the ratio, not instead of it.
Should men and women aim for the same cholesterol ratio?
The ratio targets are similar, but healthy HDL levels differ. Women typically have higher HDL, with a target around 50 mg/dL or higher, while for men the target is around 40 mg/dL or higher. Because HDL drives the ratio, compare your ratio to your own past results rather than to someone of a different sex.
Is this calculator a substitute for a doctor?
No. It is an educational tool that turns your lab numbers into ratios with general reference bands. It cannot diagnose anything or account for your full risk profile, which includes blood pressure, blood sugar, smoking, age and family history. Always review your results with a qualified healthcare professional.
Sources
- Cholesterol ratio or non-HDL cholesterol: Which is most important? , Mayo Clinic
- LDL and HDL Cholesterol and Triglycerides , U.S. Centers for Disease Control and Prevention