Enter Lipid Values
Example Data Table
| Case | LDL | HDL | Unit | LDL / HDL Ratio | Interpretation Band |
|---|---|---|---|---|---|
| Example A | 90 | 60 | mg/dL | 1.50 | Favorable |
| Example B | 120 | 50 | mg/dL | 2.40 | Favorable |
| Example C | 145 | 45 | mg/dL | 3.22 | Borderline |
| Example D | 170 | 40 | mg/dL | 4.25 | High |
Formula Used
LDL to HDL Ratio = LDL cholesterol ÷ HDL cholesterol
If you enter mmol/L, the calculator first converts values to mg/dL using 1 mmol/L × 38.67 for cholesterol values, then computes the ratio.
The result is unitless because both numbers use the same measurement scale. Optional fields can also produce total cholesterol to HDL, non-HDL to HDL, and triglycerides to HDL ratios.
How to Use This Calculator
- Enter your LDL and HDL cholesterol values from a lipid panel.
- Choose the correct unit, either mg/dL or mmol/L.
- Add optional lipid values if you want extra ratio outputs.
- Select decimal precision and submit the form.
- Review the result panel shown above the form.
- Use the export buttons to save a CSV or PDF copy.
FAQs
1. What does the LDL to HDL ratio show?
It compares less favorable LDL cholesterol with protective HDL cholesterol. The ratio helps summarize lipid balance, but it should be read alongside the complete lipid panel and medical history.
2. Can I use mmol/L values here?
Yes. Select mmol/L in the unit field. The calculator converts cholesterol values to mg/dL internally, then computes the same LDL to HDL ratio for consistent output.
3. Why is the result unitless?
A ratio divides one cholesterol value by another using the same unit. Because the units cancel out, the final LDL to HDL ratio has no remaining measurement label.
4. Does fasting matter for this ratio?
Fasting status does not directly change the formula. It may still matter for how some lipid measurements were obtained, so the calculator stores that detail in the result summary.
5. Is this enough to judge cardiovascular risk?
No. This tool gives a quick ratio, not a diagnosis. Risk evaluation usually considers total cholesterol, triglycerides, blood pressure, diabetes status, smoking, age, and family history.
6. What if my HDL value is zero?
The ratio cannot be calculated when HDL is zero because division by zero is undefined. Enter a valid HDL value greater than zero to generate a result.
7. Why include total cholesterol and non-HDL fields?
Those optional inputs let you compare additional lipid relationships from the same panel. They do not change the LDL to HDL ratio, but they can add useful context.
8. Can I export the result?
Yes. After calculation, use the CSV button for spreadsheet-ready output or the PDF button for a simple report that captures your entered values and calculated ratios.