Cholesterol/HDL Ratio: How to Calculate It and What Is a Good Ratio

How do I read the cholesterol/HDL ratio on my lab report?

In this fictitious lipid panel, the ratio is not measured: the laboratory calculates it from two lines above it.

Fictitious example of a lab report line (United States format)

Test	Result	Reference range	Flag
Cholesterol, total	210 mg/dL	<200 mg/dL	H
HDL cholesterol	42 mg/dL	>=40 mg/dL	-
Triglycerides	140 mg/dL	<150 mg/dL	-
LDL cholesterol, calculated	140 mg/dL	<100 mg/dL	H
Non-HDL cholesterol	168 mg/dL	<130 mg/dL	H
Chol/HDL ratio	5.0	<5.0	H

1. Total cholesterol and HDL are the two measured values behind the ratio.
2. Chol/HDL ratio 5.0: 210 ÷ 42 = 5.0. It has no unit, and you get the same ratio from mg/dL or mmol/L values.
3. Reference range: many labs print "less than 5.0"; others use a stricter limit, such as below 4^[9]. Your laboratory's range prevails.
4. Non-HDL cholesterol: the same two numbers subtracted instead of divided (210 − 42 = 168).

Same total cholesterol, different story: with an HDL of 70 mg/dL, the ratio would be 3.0. Our guide to reading a lipid panel explains each of the other lines.

What is the cholesterol/HDL ratio used for?

The ratio puts two opposite forces into one number. Total cholesterol includes the particles that build plaque in artery walls, while HDL cholesterol is linked with lower risk. Dividing one by the other shows the balance between them. It is sometimes called the Castelli index^[3].

It is a strong summary. In 61 studies with about 900,000 adults, the total/HDL ratio was the best simple predictor of death from coronary heart disease: 40% more informative than non-HDL cholesterol and more than twice as informative as total cholesterol alone^[2].

That is why some risk calculators use it. QRISK3, the tool used by family doctors in England, takes the total cholesterol/HDL ratio as an input^[6]. The American Heart Association's PREVENT equations, by contrast, use non-HDL and HDL cholesterol separately^[7]. Either way, the ratio feeds a risk estimate; it is not a diagnosis.

What is a good cholesterol/HDL ratio?

Lower is better. Cut-offs vary between sources and laboratories, and are often stricter for women, whose HDL limits are higher^[1].

Examples of cut-offs for the total cholesterol/HDL ratio in adults (your laboratory's range prevails)

Situation	Men	Women	Source
Higher risk, no heart disease	Above 5.0	Above 4.5	Spanish lipid experts' review[3]
Target, no heart disease	Below 4.5	Below 4.0	Same review[3]
Target after a heart attack or stroke	Below 3.5	Below 3.0	Same review[3]
Example of a hospital lab range	Below 4		Dutch hospital laboratory guide[9]

The ratio has no unit, so these figures apply whether your lab reports cholesterol in mg/dL or mmol/L. For the individual values, MedlinePlus gives a healthy total cholesterol below 200 mg/dL and an HDL of 60 mg/dL or more as best, with HDL below 40 mg/dL (men) or 50 mg/dL (women) considered low^[1].

What does a high cholesterol/HDL ratio mean?

A high ratio means too much cholesterol in plaque-forming particles, too little HDL, or both. It raises the odds of heart disease but causes no symptoms.

• Common Low HDL with inactivity, smoking, excess belly weight, high triglycerides or insulin resistance. Low HDL travels with the features of metabolic syndrome^[3].
• Common High LDL cholesterol, from diet, weight or family tendency, which pushes total cholesterol up. See LDL cholesterol levels.
• Possible Another condition that raises cholesterol, such as an underactive thyroid, or certain medicines. Pregnancy raises total cholesterol by about 40% in the second and third trimesters, so a ratio then says little about heart risk^[9].
• Rare Inherited high cholesterol (familial hypercholesterolemia), suspected when LDL is above about 190 mg/dL^[10].

A low ratio is usually reassuring. But it can come from a very high HDL, and a high HDL does not cancel a high LDL. The opposite trap also exists: a ratio can look fine while every value is high.

Two people with the same ratio of 4.0

Person	Total cholesterol	HDL	Ratio	Non-HDL
A	300 mg/dL	75 mg/dL	4.0	225 mg/dL
B	160 mg/dL	40 mg/dL	4.0	120 mg/dL

Person A carries almost twice as much cholesterol in harmful particles. This is why doctors never treat the ratio alone.

Cholesterol ratio, non-HDL, LDL or ApoB/ApoA1: which matters most?

How the ratio compares with other lipid measures

Measure	How it is obtained	Main use
Total/HDL ratio	Total cholesterol ÷ HDL	Risk summary; input for QRISK3[6]
Non-HDL cholesterol	Total cholesterol − HDL	Risk estimate in PREVENT; no fasting needed[7]
LDL cholesterol	Usually calculated by a formula	Main treatment goal in guidelines[11]
ApoB/ApoA1 ratio	Two extra protein tests	Counts particles rather than cholesterol[4]

The ratio and non-HDL come from the same two numbers. In 302,430 people, the non-HDL/HDL ratio and the ApoB/ApoA1 ratio predicted heart disease about equally well (hazard ratios 1.50 and 1.49)^[5]. In the INTERHEART study across 52 countries, the ApoB/ApoA1 ratio did better: it accounted for 54% of the population risk of heart attack, against 32% for the total/HDL ratio^[4]. Apolipoproteins cost an extra test, so they are usually reserved for unclear cases: see apolipoprotein B and apolipoprotein A1.

When it comes to treatment, your doctor will talk mainly about LDL. The 2026 US guideline, for example, sets an LDL goal below 55 mg/dL for patients at very high risk^[11].

What can affect the ratio before the blood test?

• Fasting matters little: after a usual meal, total cholesterol falls by about 8 mg/dL at most and HDL does not change^[10]. Follow your doctor's instructions anyway; see fasting before a blood test.
• Wait at least 3 months after a heart attack or a serious infection: cholesterol can be falsely low^[9].
• Avoid testing during pregnancy for a heart-risk check^[9].
• Compare ratios from the same laboratory, and allow about 3 months after changing diet, weight or medicine.
• Keep taking your usual medicines unless told otherwise.

When should I see a doctor about my cholesterol ratio?

Frequently asked questions

Is a cholesterol ratio of 3 good?

Yes, a ratio of 3 is below the cut-offs used for men and women without heart disease^[3]. Still check your LDL: a very high HDL can lower the ratio without lowering LDL.

Can I calculate my cholesterol ratio myself?

Yes: divide total cholesterol by HDL, both in the same unit. A total of 200 with an HDL of 50 gives 4.0.

Is the cholesterol/HDL ratio the same as the LDL/HDL ratio?

No. The LDL/HDL ratio uses LDL instead of total cholesterol, so its cut-offs are lower, around 3 to 3.5 for men in primary prevention^[3].

Does a statin change the ratio?

Usually yes, because it lowers total cholesterol much more than it changes HDL. Your doctor will judge the effect mainly on LDL or non-HDL cholesterol.

Related articles

• Lipid panel resultsEvery line of the report the ratio comes from
• Non-HDL cholesterol and VLDLThe same two numbers, subtracted instead of divided
• High cholesterolCauses, tests and treatments when the numbers are high
• Lipoprotein(a)An inherited risk factor that the ratio does not show
• Coronary artery diseaseThe condition that cholesterol ratios help predict

1. MedlinePlus. Cholesterol levels. US National Library of Medicine. medlineplus.gov (accessed November 1, 2026)
2. Prospective Studies Collaboration; Lewington S, Whitlock G, Clarke R, et al. Blood cholesterol and vascular mortality by age, sex, and blood pressure: a meta-analysis of individual data from 61 prospective studies with 55,000 vascular deaths. Lancet. 2007;370(9602):1829-1839. doi:10.1016/S0140-6736(07)61778-4 (accessed November 1, 2026)
3. Millán J, Pintó X, Muñoz A, et al. Lipoprotein ratios: physiological significance and clinical usefulness in cardiovascular prevention. Vasc Health Risk Manag. 2009;5:757-765. doi:10.2147/VHRM.S6269 (accessed November 1, 2026)
4. McQueen MJ, Hawken S, Wang X, et al. Lipids, lipoproteins, and apolipoproteins as risk markers of myocardial infarction in 52 countries (the INTERHEART study): a case-control study. Lancet. 2008;372(9634):224-233. doi:10.1016/S0140-6736(08)61076-4 (accessed November 1, 2026)
5. Emerging Risk Factors Collaboration; Di Angelantonio E, Sarwar N, Perry P, et al. Major lipids, apolipoproteins, and risk of vascular disease. JAMA. 2009;302(18):1993-2000. doi:10.1001/jama.2009.1619 (accessed November 1, 2026)
6. Hippisley-Cox J, Coupland C, Brindle P. Development and validation of QRISK3 risk prediction algorithms to estimate future risk of cardiovascular disease: prospective cohort study. BMJ. 2017;357:j2099. doi:10.1136/bmj.j2099 (accessed November 1, 2026)
7. Khan SS, Matsushita K, Sang Y, et al. Development and validation of the American Heart Association's PREVENT equations. Circulation. 2024;149(6):430-449. doi:10.1161/CIRCULATIONAHA.123.067626 (accessed November 1, 2026)
8. Centers for Disease Control and Prevention. Testing for cholesterol. Reviewed May 15, 2024. cdc.gov (accessed November 1, 2026)
9. Slingeland Ziekenhuis. Cholesterol/HDL ratio (K-CHOL_HDL). Laboratory test guide. slingeland.nl (accessed November 1, 2026)
10. Nordestgaard BG, Langsted A, Mora S, et al. Fasting is not routinely required for determination of a lipid profile: a joint consensus statement from the European Atherosclerosis Society and European Federation of Clinical Chemistry and Laboratory Medicine. Eur Heart J. 2016;37(25):1944-1958. doi:10.1093/eurheartj/ehw152 (accessed November 1, 2026)
11. Siddiqi AK, Jacob J, Khan MS, Kulkarni A. Top 10 concepts in secondary ASCVD prevention from the 2026 ACC/AHA dyslipidemia guideline: what is new and why it matters. Curr Atheroscler Rep. 2026;28(1). doi:10.1007/s11883-026-01465-5 (accessed November 1, 2026)
12. Medicare.gov. Cardiovascular disease screenings. Centers for Medicare & Medicaid Services. medicare.gov (accessed November 1, 2026)

This page is general information. It does not replace the advice of a doctor, who interprets your results with your symptoms, history and examination.