Total-to-HDL Cholesterol Ratio CalculatorFree online fitness & health calculator — instant results, no sign-up
Calculate the ratio of total cholesterol to HDL cholesterol.
For general information only. This is not medical advice, diagnosis, dosing guidance or a treatment recommendation. Talk to a doctor or other qualified health professional about your health, pregnancy, or diet.
Sign in to save results and favorites.
About the Total-to-HDL Cholesterol Ratio Calculator
The Total-to-HDL Cholesterol Ratio Calculator divides total cholesterol by HDL cholesterol to show their relative amounts in your blood. Enter both results in mg/dL from your lipid panel to calculate a unitless ratio. This tool provides an educational estimate for adults, not a diagnosis or treatment recommendation.
- Total cholesterol (mg/dL)
- Total cholesterol is the overall cholesterol concentration reported on your blood test, measured in milligrams per deciliter (mg/dL), with a default value of 190.
- HDL cholesterol (mg/dL)
- HDL cholesterol is the cholesterol carried by high-density lipoproteins in your blood, measured in milligrams per deciliter (mg/dL), with a default value of 55.
Formula and method
R = TC / HDL; with the default inputs, R = 190 / 55 = 3.4545…, displayed as 3.45.
- RTotal-to-HDL cholesterol ratio, which has no units.
- TCTotal cholesterol concentration in mg/dL.
- HDLHDL cholesterol concentration in mg/dL; it must be greater than zero.
Divide total cholesterol by HDL cholesterol, using values from the same lipid panel and expressed in the same units. The mg/dL units cancel, leaving a unitless ratio. Round the result to two decimal places for display; 190 divided by 55 produces 3.45.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Total cholesterol190 mg/dL
- HDL cholesterol55 mg/dL
Results
- Total-to-HDL ratio3.45
- NoteEducational estimate for adults; not a diagnosis or treatment recommendation.
How to use the Total-to-HDL Cholesterol Ratio Calculator
- 1Find the total cholesterol and HDL cholesterol results on the same lipid panel.
- 2Confirm that both results are in mg/dL before entering them in the labeled fields.
- 3Enter total cholesterol; the default value is 190 mg/dL.
- 4Enter HDL cholesterol; the default value is 55 mg/dL, and the value must be greater than zero.
- 5Read the calculated ratio and educational note; the default inputs produce a total-to-HDL ratio of 3.45.
Reading your result
The “Total-to-HDL ratio” row shows how many times the total cholesterol concentration is the HDL cholesterol concentration. With total cholesterol of 190 mg/dL and HDL cholesterol of 55 mg/dL, the displayed ratio is 3.45, meaning total cholesterol is approximately 3.45 times HDL cholesterol. Lower ratios are generally associated with a more favorable cardiovascular risk profile, but this result alone cannot establish whether your cholesterol levels are healthy. The “Note” row states: “Educational estimate for adults; not a diagnosis or treatment recommendation.” It clarifies that the result is informational rather than a clinical assessment.
Limitations
The calculation assumes accurate, same-unit laboratory results and a positive HDL value; division by zero is undefined, and negative cholesterol values are invalid. The ratio does not directly assess LDL cholesterol, triglycerides, blood pressure, smoking, diabetes, age, or other cardiovascular risk factors. Different absolute cholesterol levels can produce the same ratio, so a favorable-looking result does not rule out elevated LDL cholesterol or cardiovascular risk. This adult educational tool should not be used on its own to set treatment goals, change medication, or interpret children's lipid results.
Common questions
Why do total cholesterol of 190 mg/dL and HDL cholesterol of 55 mg/dL give a ratio of 3.45?+
The calculator divides 190 by 55 to obtain 3.4545…, then rounds to two decimal places. Because both measurements use mg/dL, the ratio itself has no units.
Is the total-to-HDL ratio the same as LDL cholesterol?+
No. The ratio compares total cholesterol with HDL cholesterol; it does not calculate LDL cholesterol. Review the LDL result on your lipid panel separately with your clinician.
Can I enter cholesterol results reported in mmol/L?+
The fields are labeled for mg/dL, so convert both results to mg/dL before entering them. Mathematically, the ratio is unchanged when both cholesterol values are converted by the same factor, but mixing mg/dL and mmol/L produces an incorrect result.
Does a ratio of 3.45 mean I do not need cholesterol treatment?+
No. A ratio of 3.45 alone cannot determine whether treatment is appropriate. Treatment decisions depend on individual lipid values, especially LDL cholesterol, along with medical history and overall cardiovascular risk.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
Further reading
You might also like
Macro Calculator
Daily protein, carbs and fat for your goal.
Carbohydrate Calculator
Daily carb range (45–65% of calories).
Protein Calculator
Daily protein needs by weight and activity.
Fat Intake Calculator
Healthy daily fat range.
TDEE Calculator
Total daily energy expenditure.
GFR Calculator
Kidney function estimate (CKD-EPI 2021).
Results are estimates for informational purposes and are not financial, medical or legal advice.