Cholesterol Ratio Calculator
Total/HDL, LDL/HDL and non-HDL from your lipid panel
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Your total cholesterol number alone says little — the ratios matter more. This calculator works out your total-to-HDL ratio (a strong heart-risk marker, ideally below 3.5), your LDL-to-HDL ratio and your non-HDL cholesterol (everything except the protective HDL). Enter the values from your lipid panel in mg/dL. Lower ratios generally mean lower cardiovascular risk, but targets are individual, so always interpret results with your doctor.
General information only, not a diagnosis. Cholesterol targets depend on your overall risk — discuss results with your doctor.
How to use this cholesterol ratio calculator
Enter your total cholesterol and your HDL, choosing mg/dL or mmol/L to match your lab report, and add LDL or triglycerides if the fields ask for them. Press calculate and your total-to-HDL ratio appears instantly, together with a risk category and, when available, an LDL/HDL or TG/HDL figure. There is no sign-up and nothing to install — grab the numbers straight from your latest lipid panel and read the result in seconds.
How to read your result
For the TC/HDL ratio, lower is better because it means a larger share of your cholesterol is the protective HDL type. As a rough guide, under about 3.5 is considered ideal, around 5 is average, and much above 5 is linked with rising cardiovascular risk. A high HDL pulls the ratio down even when total cholesterol looks high, which is one reason the ratio can tell you more than a single number alone.
The science behind the ratio
The ratio sets total cholesterol against protective HDL, and many large studies find this proportion predicts heart-disease risk better than total cholesterol on its own. HDL helps clear cholesterol from artery walls, so a higher HDL relative to the total signals a more favourable lipid balance. The triglyceride-to-HDL ratio is used differently — it serves as a rough marker of insulin resistance, which is why some panels report it alongside the classic cholesterol figures.
Limits and practical tips
This is an educational estimate, not a diagnosis: your true risk also depends on blood pressure, blood sugar, smoking, age and family history, so use a fasting laboratory panel and go over the numbers with your doctor. Ratios shift with diet, exercise and quitting smoking, all of which tend to raise HDL and improve the balance. To see the fuller picture, pair this with CaloNote's BMI calculator and its Waist-to-Hip Ratio tool, and use the CaloNote app to track the habits that move these markers.
Frequently Asked Questions
- What is the cholesterol ratio?
- The cholesterol ratio compares your lipid values to gauge heart risk. The most common is the total-to-HDL ratio (total cholesterol divided by HDL). It often predicts cardiovascular risk better than total cholesterol alone, because it accounts for protective HDL.
- How do I calculate my cholesterol ratios?
- Enter the values from your lipid panel. The tool computes total-to-HDL ratio, LDL/HDL ratio, and non-HDL cholesterol (total minus HDL). These give a fuller picture than any single number, helping you and your doctor interpret your results in context.
- What is a healthy cholesterol ratio?
- A total-to-HDL ratio below about 5 is generally desirable, with under 3.5 considered optimal; lower is better. Non-HDL cholesterol under roughly 130 mg/dL is a common target. Ratios are one piece of risk assessment, not a diagnosis, so review them with your clinician.