LDL Cholesterol Calculator
Understanding Your LDL Calculation
LDL (Low-Density Lipoprotein) is often referred to as "bad" cholesterol because high levels lead to plaque buildup in your arteries. This calculator uses the Friedewald Formula, which is the standard clinical method for estimating LDL levels when a direct measurement is not performed.
The Friedewald Formula
The calculation is based on the following mathematical relationship:
LDL = Total Cholesterol – HDL – (Triglycerides / 5)
Note: The "Triglycerides / 5" component represents VLDL (Very Low-Density Lipoprotein) cholesterol. This formula is highly accurate as long as Triglyceride levels are below 400 mg/dL.
LDL Cholesterol Ranges
| LDL Level (mg/dL) | Category |
|---|---|
| Below 100 | Optimal |
| 100 – 129 | Near Optimal |
| 130 – 159 | Borderline High |
| 160 – 189 | High |
| 190 and above | Very High |
Example Calculation
Suppose an individual has the following lipid profile results:
- Total Cholesterol: 220 mg/dL
- HDL Cholesterol: 55 mg/dL
- Triglycerides: 125 mg/dL
Using the formula: 220 – 55 – (125 / 5) = 220 – 55 – 25 = 140 mg/dL. This result falls into the "Borderline High" category.
Important Considerations
While this calculator provides a reliable estimate, direct LDL testing may be necessary if your Triglycerides are over 400 mg/dL, as the Friedewald formula loses accuracy at high triglyceride levels. Always consult with a healthcare professional to interpret your results in the context of your overall health, including blood pressure, smoking status, and family history.