Cholesterol ratio chart: total/HDL, LDL/HDL, and TG/HDL

A cholesterol ratio chart can organize total cholesterol, LDL, HDL, and triglycerides into quick comparisons. The formulas are easy; the interpretation is harder because a favorable ratio can still hide an important absolute result.

Calculate all three with our cholesterol ratio calculator.

Why there is more than one cholesterol ratio

Each ratio asks a different question. Total-to-HDL compares all measured cholesterol with HDL. LDL-to-HDL narrows the comparison to two familiar fractions. TG-to-HDL combines a circulating fat with HDL and is often discussed in metabolic-health research.

None counts atherogenic particles directly, and none includes blood pressure, smoking, diabetes, kidney disease, age, or family history.

How the three cholesterol ratios are calculated

Ratio	Formula	Main use
Total/HDL	Total cholesterol ÷ HDL	Broad balance between total cholesterol and HDL
LDL/HDL	LDL cholesterol ÷ HDL	Compares two cholesterol fractions
TG/HDL	Triglycerides ÷ HDL	Highlights a triglyceride-low-HDL metabolic pattern

Use values from the same test and the same unit. Total/HDL and LDL/HDL are unitless. Read our TG/HDL guide before applying an mg/dL cutoff to an mmol/L ratio.

Cholesterol ratio chart

Many resources describe total/HDL around 3 to 4 as more favorable and values above 5 as less favorable. LDL/HDL is often described with lower values as preferable. TG/HDL research commonly tests thresholds near 2 to 4 in mg/dL units.

Those are educational guideposts, not universal treatment targets. Population, laboratory conditions, sex, ethnicity, diabetes status, and the outcome studied change the useful threshold. Current guidelines focus treatment on LDL, non-HDL, and overall cardiovascular risk rather than one ratio color.

Why a ratio can look good for the wrong reason

A ratio improves when the numerator falls or the denominator rises. That sounds obvious, but it changes how the result should be read. A total-to-HDL ratio of 3.5 could come from total cholesterol of 175 and HDL of 50. It could also come from total cholesterol of 280 and HDL of 80. The division produces the same 3.5, while the second panel contains much more cholesterol outside HDL.

HDL is part of the calculation, not a shield that neutralizes LDL. Very high HDL does not guarantee protection, and treatment is not aimed at raising HDL just to make the ratio smaller. What matters is why each measured value is where it is and how the full panel fits the person’s cardiovascular risk.

LDL-to-HDL has the same blind spot. LDL of 120 with HDL of 50 gives 2.4. LDL of 168 with HDL of 70 also gives 2.4, yet the second person has nearly 50 mg/dL more LDL cholesterol, and that is the number guidelines respond to. The 2026 AHA summary sets goals for LDL and non-HDL by risk level; it doesn’t set an LDL-to-HDL cutoff. Older articles often quote “ideal” LDL/HDL figures, but they don’t carry the same weight. The ratio also inherits any error in calculated LDL, which grows when triglycerides are high.

A falling LDL-to-HDL ratio may reflect lower LDL, which is generally useful, or higher HDL with unchanged LDL. Those are not equivalent changes. Keep the original LDL result beside the ratio so the arithmetic cannot hide it.

TG-to-HDL is even more sensitive to context because triglycerides can change after food, alcohol, illness, or poorly controlled glucose. A lower result on one repeat test is encouraging only after the testing conditions and the separate triglyceride value are checked.

Two lipid panels with the same ratio

Here is a concrete comparison:

Value	Panel A	Panel B
Total cholesterol	180 mg/dL	270 mg/dL
HDL cholesterol	60 mg/dL	90 mg/dL
Total/HDL ratio	3.0	3.0
Non-HDL cholesterol	120 mg/dL	180 mg/dL

The matching ratio does not make the panels interchangeable. Panel B has non-HDL cholesterol 60 mg/dL higher. A clinician would also want LDL, triglycerides, blood pressure, diabetes status, smoking history, family history, and any previous cardiovascular event before discussing treatment.

Now reverse the lesson. Someone with genetically low HDL may have an unfavorable ratio even when LDL is close to their personal goal. Trying to “fix the ratio” by focusing only on HDL can distract from actions with better evidence, such as managing LDL, blood pressure, smoking, activity, and diabetes.

This is why a ratio is best treated as a summary line. It can start a question, but it should not end the review.

Unit rules that prevent a bad calculation

Total/HDL and LDL/HDL do not change when both inputs are converted correctly between mg/dL and mmol/L. Total cholesterol, LDL, and HDL all use the same cholesterol conversion factor, so it cancels during division.

TG/HDL is different. Triglycerides and cholesterol use different conversion factors. A TG/HDL result calculated in mg/dL cannot be compared with a threshold taken from research that calculated both values in mmol/L. The calculator needs to know which unit system the source uses.

Never divide a triglyceride result in mg/dL by an HDL result in mmol/L. Do not combine values from separate blood draws either. The panel should represent one sample collected at one time.

Rounding creates small differences. If the laboratory displays whole numbers but calculated internally with more precision, your hand calculation may be off by a tenth. That is not a meaningful change in cardiovascular risk.

What current cholesterol care looks at first

The 2026 AHA dyslipidemia guideline returns LDL and non-HDL treatment goals to the center of the discussion. The appropriate goal depends on risk. Someone with a previous heart attack or stroke is not assessed by the same general reference range as a young adult without known cardiovascular disease.

The guideline also recommends measuring lipoprotein(a) at least once in adulthood and using apoB selectively when it can clarify risk. ApoB can be useful when triglycerides are elevated, diabetes is present, or LDL is already low but uncertainty remains about the number of atherogenic particles.

None of those values can be recovered reliably from a cholesterol ratio. A ratio also cannot tell whether plaque is already present or account for family history. In selected cases, a clinician may use a formal risk estimate or coronary artery calcium scan to decide whether medication would provide enough benefit.

If you already take a statin or another lipid-lowering medicine, compare the same absolute targets over time. A changing ratio may be interesting, but adherence, side effects, dose, LDL, non-HDL, and the clinical goal are the practical questions.

How to compare one panel with the next

Use the same laboratory when practical, and note whether each test was fasting. Many routine lipid panels do not require fasting, but a fasting repeat may be requested when triglycerides are unexpectedly high or calculated LDL is hard to trust.

Record recent illness, major dietary changes, alcohol intake, pregnancy, and medicine changes. A single unusual panel does not prove a long-term trend. If a value is far from previous results, ask whether it should be repeated before making a major decision.

Compare the individual components first. Did LDL fall? Did triglycerides change? Is HDL stable? Then calculate non-HDL and any ratio you use. This order keeps the summary from replacing the evidence underneath it.

For lifestyle changes, focus on habits that affect overall risk rather than chasing a ratio. That can include replacing saturated fat with unsaturated fat, eating more fiber-rich foods, moving regularly, avoiding tobacco, moderating alcohol, and managing glucose and blood pressure. Medication decisions belong with the clinician who knows your risk and history.

Worked example

Suppose a panel shows:

• Total cholesterol: 220 mg/dL
• LDL: 140 mg/dL
• HDL: 60 mg/dL
• Triglycerides: 100 mg/dL

The ratios are 3.7 total/HDL, 2.3 LDL/HDL, and 1.7 TG/HDL. Those ratios look relatively favorable, but LDL of 140 mg/dL still deserves interpretation based on the person’s risk. A strong HDL value does not erase LDL exposure.

What to review alongside the ratios

Calculate non-HDL cholesterol by subtracting HDL from total cholesterol. Ask whether apoB or lipoprotein(a) testing would add value based on your history. If LDL was calculated, review the Friedewald formula and its limitations.

Bring the actual report, not a screenshot that shows only the ratio. The method used for LDL, the units, reference notes, and fasting status may all be printed elsewhere on the page.

Family history can change what happens next even when every ratio looks ordinary. Tell the clinician about a parent, sibling, or child with very high cholesterol or cardiovascular disease at an unusually young age. Ask whether lipoprotein(a) has been checked at least once. That inherited marker is not visible in total/HDL, LDL/HDL, or TG/HDL, and diet usually does not explain a high result. A ratio calculator cannot screen for an inherited lipid disorder.

Keep the full panel visible

Ratios are summaries, not verdicts. Keep the original laboratory values visible and let the full cardiovascular-risk picture determine what happens next.