LDL Calculator (Friedewald Formula)

What Is an LDL Calculator (Friedewald Formula)?

The LDL Calculator using the Friedewald Formula helps you estimate your low-density lipoprotein (LDL) cholesterol levels based on your total cholesterol, HDL cholesterol, and triglyceride values. LDL is often referred to as "bad cholesterol" because high levels can increase the risk of heart disease and stroke.

Why LDL Cholesterol Matters

LDL cholesterol plays a major role in the buildup of plaque in arteries, a process called atherosclerosis. Monitoring your LDL levels is crucial for assessing your cardiovascular risk and making informed decisions about diet, exercise, and medication.

How LDL Is Calculated (Friedewald Formula)

This calculator uses the Friedewald equation to estimate LDL cholesterol without requiring a direct lab measurement:

LDL = Total Cholesterol − HDL − (Triglycerides ÷ 5)

This formula provides a quick estimate of LDL in mg/dL or mmol/L, depending on your unit selection.

When This Formula Is Applicable

• The Friedewald formula is most accurate when triglyceride levels are below 400 mg/dL (or 4.5 mmol/L).
• It is commonly used in standard lipid panels when fasting blood samples are taken.
• For high triglyceride levels, a direct LDL measurement is recommended.

Benefits of Using the LDL Calculator

• Quick and easy estimation of LDL cholesterol.
• Helps monitor cardiovascular risk between lab visits.
• Useful for healthcare professionals and individuals tracking cholesterol levels.

Important Considerations

• This tool is for estimation only and does not replace professional medical advice.
• Always consult your doctor for proper diagnosis and treatment decisions.

How to Use the LDL Calculator (Friedewald Formula)

The LDL calculator provides a fast and easy way to estimate your LDL cholesterol using the Friedewald formula. Follow these steps to calculate your LDL value accurately.

Step 1: Choose Your Unit of Measurement

Select your preferred unit from the dropdown menu. You can choose between milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L), depending on how your lab results are reported.

Step 2: Enter Your Total Cholesterol

Input your total cholesterol value. This number is typically provided in your standard lipid panel blood test.

Step 3: Enter Your HDL Cholesterol

Fill in your HDL cholesterol value, commonly known as "good cholesterol." Higher HDL levels are usually beneficial for heart health.

Step 4: Enter Your Triglyceride Level

Input your triglyceride reading from your blood test. Note that this formula works best when triglyceride levels are below 400 mg/dL (or 4.5 mmol/L).

Step 5: Click Calculate

Press the Calculate button. The calculator will automatically apply the Friedewald formula to display your estimated LDL cholesterol.

Step 6: Interpret Your Results

The calculator will display your LDL cholesterol value, helping you understand your cardiovascular risk. Discuss the result with your healthcare provider for proper interpretation.

Example Calculation

• Total Cholesterol: 200 mg/dL
• HDL: 50 mg/dL
• Triglycerides: 150 mg/dL

LDL = 200 − 50 − (150 ÷ 5) = 120 mg/dL

Important Notes

• The Friedewald formula is not suitable for very high triglyceride levels.
• This tool offers an estimate and should not replace direct laboratory LDL measurement when recommended.
• Always consult your doctor for personalized cholesterol management advice.