Cholesterol Ratio Calculator

Total/HDL, LDL/HDL and non-HDL from your lipid panel

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Cholesterol Ratio Calculator

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 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.

How to use this cholesterol ratio calculator

Enter total cholesterol and HDL in mg/dL. LDL is optional and must use the same unit. Press Calculate to see total/HDL ratio and non-HDL cholesterol; LDL/HDL appears only when you enter LDL. The tool has no mmol/L selector or triglyceride input. Do not enter mmol/L values into fields labelled mg/dL: although a ratio cancels matching units, the non-HDL result is displayed in mg/dL.

The science behind the ratio

Total/HDL is total cholesterol divided by HDL. LDL/HDL is LDL divided by HDL, when LDL is provided. Non-HDL cholesterol is total cholesterol minus HDL. For example, total cholesterol of 200 mg/dL, HDL of 50 mg/dL and LDL of 120 mg/dL gives ratios of 4.0 and 2.4, with non-HDL cholesterol of 150 mg/dL. This calculator does not calculate a triglyceride/HDL ratio.

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.

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