What is calculated
Three arithmetic summaries from one lipid panel.
Cholesterol Ratio Calculator
Total cholesterol to HDL ratio
Enter your values, then calculate to see a verified result.
Reference range
How this result is calculated
A clear calculation path based on your inputs.
Inputs usedReview the information used for this result.
Full calculation and sourcesOpen Full calculation and sources to review the formula, assumptions, boundaries, and evidence.
Versioned calculationFormula v1.0.1
Method
Divide by HDL and subtract HDL from total cholesterol.
Important boundary
Treatment decisions depend on absolute values and overall risk, not one ratio.
Use one panelUse the labeled input and matching unit.
Measured or label valueCalculate both ratiosThe calculator applies the stated equation.
Full precision firstKeep absolute valuesKeep the boundary beside the result.
Reference, not diagnosisInterpretation
:1 is the total/HDL ratio.
LDL/HDL and non-HDL remain visible.
No treatment threshold or diagnosis is assigned.
Use this result
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Method and test recordFormula v1.0.1
- Recorded scope
- health-wellness-completion
- Publisher
- CalculatorGeek
- Recorded review date
- 2026-10-05
- Next source review
- 2027-04-05
- Definition fixtures
- 2 configured scenarios
- Published examples
- 2 shown below
Recorded method
Verify both ratio directions, non-HDL subtraction, and matched-unit invariance.
These records describe the published model and reference tests. A test-case count is not a certification of every possible input or an independent specialist review. Editorial policy
Known limitations
- Does not calculate 10-year cardiovascular risk.
- Does not assess triglycerides, medicines, age, smoking, diabetes, or blood pressure.
- Laboratory methods and fasting status can matter.
Method sources
Latest model update
2026-10-05 - Initial evidence-limited shared-system implementation with fixtures, original support content, and contextual links.
Reference inputs and expected results
Up to 12 examples from the configured definition fixtures are shown. Expected values use the stated output units; invalid inputs are intended to be rejected.
| Case | Inputs | Expected result |
|---|---|---|
| lipid panel reference | Total cholesterol: 190 mg/dL; HDL cholesterol: 50 mg/dL; LDL cholesterol: 110 mg/dL | Total cholesterol / HDL: 3.8 :1; LDL / HDL: 2.2 :1; Non-HDL cholesterol: 140 mg/dL (allowed numeric tolerance: 0.0001) |
| matching mmol units | Total cholesterol: 4.91336954 mmol/L; HDL cholesterol: 1.29299198 mmol/L; LDL cholesterol: 2.84458236 mmol/L | Total cholesterol / HDL: 3.8 :1; LDL / HDL: 2.2 :1 (allowed numeric tolerance: 0.001) |
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On this page
What the Cholesterol Ratio Calculator calculates
Calculate total/HDL, LDL/HDL, and non-HDL cholesterol from one laboratory panel.
This consolidates cholesterol-ratio and LDL/HDL intent while preserving the absolute non-HDL value.
Continue this workflow with the Metabolic Syndrome Criteria Checker. Audit all five NHLBI criteria.
How to use the Cholesterol Ratio Calculator
- Use total cholesterol, HDL, and LDL from the same panel.
- Keep units consistent.
- Review ratios beside absolute laboratory values.
- Use a validated risk assessment for clinical decisions.
Continue with the A1C Calculator. Convert A1C into estimated average glucose.
Formula, variables and calculation order
TC/HDL = total / HDL; LDL/HDL = LDL / HDL; non-HDL = total - HDL.
Inputs are validated and normalized before calculation. Full precision is retained until the displayed result is rounded.
Cross-check a different part of the decision with the Blood Pressure Calculator. Classify a measured systolic and diastolic pair.
Worked example and boundary check
Worked example
190 total, 50 HDL, and 110 LDL gives TC/HDL 3.8, LDL/HDL 2.2, and non-HDL 140 mg/dL.
Boundary check
A low or high ratio cannot by itself establish overall cardiovascular risk.
How to interpret the result
Use these as mathematical summaries of a panel. Discuss abnormal results and risk-based treatment with an appropriate clinician.
- Does not calculate 10-year cardiovascular risk.
- Does not assess triglycerides, medicines, age, smoking, diabetes, or blood pressure.
- Laboratory methods and fasting status can matter.
For a separate result with different assumptions, open the Cholesterol Ratio Calculator. Calculate common lipid ratios without diagnosing disease.
Frequently asked questions
Is this the same as LDL/HDL?
No; both ratios are shown and labeled separately.
Which ratio should I use?
Clinical use depends on the context; do not substitute one ratio for a full risk assessment.
Can I mix mmol/L and mg/dL?
All three inputs must use the same concentration unit; the ratio is unchanged when units match.
Does a good ratio cancel a high LDL?
No. Absolute values still matter.
Primary sources and evidence limits
Sources were checked 2026-10-05. A reference value, conversion, or schedule estimate is not a diagnosis, prescription, individualized treatment target, or substitute for professional care.