Total Cholesterol / HDL Ratio (TC/HDL)

What This Calculator Measures

Calculates the total cholesterol to HDL ratio (TC/HDL), a simple lipid-based indicator of cardiovascular risk that compares total cholesterol with the protective HDL fraction.

How to Use

1. Use a fasting lipid panel for consistency.
2. Enter total cholesterol and HDL cholesterol (both in mg/dL).
3. Review the ratio and its risk category.
4. Interpret together with LDL, non-HDL cholesterol, and a global risk score.

Interpretation Guide

A TC/HDL ratio below 4 is desirable, 4–5 is moderate, and above 5 is elevated and associated with higher cardiovascular risk. Values near 3.5 or lower are associated with lower risk in epidemiological cohorts. The ratio is a risk marker, not a treatment target.

Clinical Significance

The TC/HDL ratio summarizes the balance of atherogenic total cholesterol and protective HDL and has been used for decades in cardiovascular epidemiology (e.g., PROCAM, Framingham) as a simple risk indicator.

When to Use

• Cardiovascular risk screening in primary prevention
• Patient education about lipid profile balance
• Quick bedside risk communication

When Not to Use

• As the sole basis for statin initiation — use validated risk scores
• In acute illness or with non-fasting samples without adjustment
• As a replacement for LDL or non-HDL cholesterol in treatment decisions

Limitations

• Does not replace LDL or non-HDL cholesterol in most modern guidelines.
• Non-fasting samples and acute illness can alter triglycerides and the ratio.
• Healthy women typically have a lower ratio than men of the same age.

Worked Example

A 48-year-old man has a total cholesterol of 180 mg/dL and HDL of 60 mg/dL.

TC/HDL = 180 ÷ 60 = 3.0. This value below 4 is desirable and associated with lower cardiovascular risk.

Evidence

Source

Epidemiological association (peer-reviewed)

Reference

Stampfer MJ, et al. A prospective study of cholesterol, apolipoproteins, and the risk of myocardial infarction. N Engl J Med. 1991;325(6):373-381.

Reviewed By

MedCalcHub Clinical Team

Version

1.0

Updated

2026-08

1. Stampfer MJ, et al. N Engl J Med. 1991;325(6):373-381.
2. Assmann G, et al. The role of HDL cholesterol in the metabolic syndrome. Atheroscler Suppl. 2002;3(4):35-41.

References

1. Stampfer MJ, et al. A prospective study of cholesterol, apolipoproteins, and the risk of myocardial infarction. N Engl J Med. 1991;325(6):373-381. (Validation Study)
2. Assmann G, et al. The role of HDL cholesterol in the metabolic syndrome. Atheroscler Suppl. 2002;3(4):35-41. (Expert Review)

Frequently Asked Questions