Cholesterol Ratio Calculator
Work out your total-to-HDL ratio and non-HDL cholesterol from your lipid results.
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How this calculator works
Total-to-HDL ratio = total cholesterol ÷ HDL cholesterol in matching units. Non-HDL cholesterol = total cholesterol − HDL cholesterol. This calculator uses 38.67 mg/dL per mmol/L for cholesterol.
A ratio is not a complete cardiovascular risk assessment. It can hide an elevated LDL or ApoB result. This tool does not estimate LDL, diagnose disease or determine whether treatment is needed.
Method implementation checked October 28, 2026. Educational information, not a diagnosis or a treatment recommendation.
What does your cholesterol ratio leave out?
Your total-to-HDL cholesterol ratio describes the relationship between two values on a lipid panel. Non-HDL cholesterol shows the cholesterol carried outside HDL. Both are useful ways to organize a report, but a ratio can look similar in people with quite different cholesterol concentrations. [1]
How are the ratio and non-HDL cholesterol different?
The ratio divides total cholesterol by HDL; non-HDL subtracts HDL from total cholesterol. The ratio describes their proportions, while non-HDL tells you the concentration of cholesterol outside HDL. Keep the measurement label and units with each number so the two outputs are not confused. [1]
Can two people have the same ratio but different results?
Yes. Total cholesterol of 200 with HDL of 50 gives a ratio of 4. Total cholesterol of 280 with HDL of 70 also gives 4, but non-HDL is 210 mg/dL rather than 150 mg/dL. The matching ratio hides that difference. These examples illustrate the arithmetic, not treatment targets. [1]
- Read total cholesterol and HDL individually.
- Check LDL, non-HDL and triglycerides on the same report.
- Do not use a smaller ratio as proof that every lipid result improved.
What can an ApoB test add?
LDL and non-HDL describe cholesterol concentrations. ApoB adds information about the number of particles that can deposit cholesterol in artery walls. It is an additional measurement, not something this ratio can calculate. [2]
How do you turn the numbers into a useful next step?
The American Heart Association advises interpreting cholesterol with age, blood pressure, smoking, diabetes and family history. A calculator using only total cholesterol and HDL cannot account for those factors. Keep the full lipid panel and health history together when discussing your results, including any food and activity changes aimed at lowering LDL cholesterol. [1]
- Compare the same measurements and units across reports.
- Note whether a change came from total cholesterol, HDL or both.
- Use your overall risk and individual lipid results to guide decisions, rather than trying to change the ratio alone.
Give your heart-health plan more detail
Learn how to interpret your cholesterol-to-HDL ratio- ApoB adds information about the number of cholesterol-carrying particles associated with plaque buildup, giving you another way to assess risk alongside LDL and non-HDL cholesterol.
- Lipoprotein(a), or Lp(a), measures a largely inherited contributor to heart risk. Testing it adds information that can be especially useful when heart disease runs in your family.
- With Mito membership, a clinician reviews your results in the context of your health history. Your action plan connects those findings to changes to consider and markers to follow.
References
Frequently asked questions
Is total-to-HDL ratio the same as LDL-to-HDL ratio?
No. They use different numerators. This tool divides total cholesterol by HDL cholesterol, so its output should not be compared with a reference for LDL-to-HDL ratio.
Does this calculator estimate LDL cholesterol?
No. It calculates total-to-HDL ratio and non-HDL cholesterol. LDL estimation uses a separate method and generally needs additional lipid information. [1]
Why does the ratio stay the same in mg/dL and mmol/L?
Converting both cholesterol values multiplies or divides them by the same factor, which cancels in a ratio. Non-HDL is a concentration, so its numerical value changes with the unit.
Should I try to raise HDL to improve my ratio?
Do not use the ratio alone as a treatment target. Raising the denominator changes the calculation without showing what happened to LDL or your overall risk. Read HDL alongside the rest of the lipid panel. [1]
Make sense of the rest of your lipid results
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