LDL Calculator (Friedewald)
LDL = Total − HDL − (TG/5).
Friedewald equation. Informational only — not a medical diagnosis.
How the Math Works
The LDL Calculator using the Friedewald formula computes Low-Density Lipoprotein cholesterol levels through a simple arithmetic operation. The calculation subtracts HDL (High-Density Lipoprotein) cholesterol and one-fifth of triglycerides from total cholesterol: LDL = Total Cholesterol - HDL - (Triglycerides / 5). This equation works because triglycerides and cholesterol are carried together in lipoprotein particles, allowing estimation of LDL cholesterol - often called 'bad cholesterol' - when direct measurement isn't available.
Practical Applications
To use this calculator, you need three blood test results: total cholesterol, HDL cholesterol, and triglycerides, all measured in mg/dL. Enter these values into the calculator in their respective fields. The calculator will automatically apply the Friedewald formula to provide your LDL cholesterol level. Note that this formula is reliable only when triglyceride levels are below 400 mg/dL, as accuracy decreases with higher triglyceride concentrations.
Day-to-Day Use
Understanding your LDL cholesterol helps you make informed decisions about heart health and lifestyle choices. High LDL levels often lead to plaque buildup in arteries, increasing cardiovascular disease risk. By tracking LDL through this calculation, you can monitor the effectiveness of diet changes, exercise programs, or medications prescribed by your doctor. This knowledge empowers you to take proactive steps like reducing saturated fat intake, increasing physical activity, or quitting smoking to maintain healthy cholesterol levels and protect your cardiovascular system.
FAQ
Accurate?
Not valid when TG > 400 mg/dL.