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Friedewald LDL & Non-HDL Cholesterol Calculator

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### Clinical Lipidology: The Friedewald Formula & Atherosclerosis Low-Density Lipoprotein Cholesterol (LDL-C) is the primary causal driver of atherosclerotic cardiovascular disease (ASCVD). In.

Reviewed by Dr. Shahzad · DHMS, RMP
Last updated:
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📊 Results

Calculated LDL-C & ATP III Risk Category Summary
Calculated LDL-C: 130.0 mg/dL (Borderline High) ➔ Non-HDL: 160.0 mg/dL | VLDL: 30.0 mg/dL
Calculated LDL 'Bad' Cholesterol (LDL-C)
130.0 mg/dL
Non-HDL Cholesterol (Atherogenic Particle Load)
160.0 mg/dL (Total Atherogenic Particles)
Estimated VLDL Cholesterol (VLDL-C)
30.0 mg/dL (Estimated VLDL-C)
NCEP ATP III / AHA Clinical Classification
Borderline High (130–159 mg/dL / 3.4–4.1 mmol/L)
Friedewald Equation Clinical Validity Check
OPTIMAL ACCURACY: Triglycerides < 200 mg/dL; Friedewald equation closely matches ultracentrifugation reference standards.
✦ Clinical Lipidology Assessment & Statin Indication
Clinical Lipid Profile Assessment: From Total Cholesterol of 210 mg/dL, HDL-C of 50 mg/dL, and Triglycerides of 150 mg/dL: [1. Friedewald LDL-C]: Calculated at **130.0 mg/dL** (deducting HDL-C and VLDL-C of **30.0 mg/dL**). [2. ATP III Classification]: Ranked as **Borderline High (130–159 mg/dL / 3.4–4.1 mmol/L)**. [3. Atherogenic Non-HDL]: Total atherogenic particle load (Non-HDL-C = TC - HDL) is **160.0 mg/dL** (optimal target is typically within 30 mg/dL of LDL target). [4. Equation Validity]: OPTIMAL ACCURACY: Triglycerides < 200 mg/dL; Friedewald equation closely matches ultracentrifugation reference standards.
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📐 Formula

Friedewald LDL-C & Lipid Fraction formulas:
**In Conventional US Units (mg/dL):**
VLDL-C = Triglycerides5
LDL-C = Total Cholesterol - HDL-C - Triglycerides5
Non-HDL-C = Total Cholesterol - HDL-C
**In Standard SI Units (mmol/L):**
VLDL-C = Triglycerides2.2
LDL-C = Total Cholesterol - HDL-C - Triglycerides2.2

💡 Practical Example

✅

For example, evaluating a fasting lipid panel with Total Cholesterol 210 mg/dL, HDL-C 50 mg/dL, and Triglycerides 150 mg/dL: Estimated VLDL-C is \. Calculated Friedewald LDL-C is \. Non-HDL cholesterol is \.

📖 About Friedewald LDL & Non-HDL Cholesterol Calculator

Clinical Lipidology: The Friedewald Formula & Atherosclerosis

Low-Density Lipoprotein Cholesterol (LDL-C) is the primary causal driver of atherosclerotic cardiovascular disease (ASCVD). In standard clinical chemistry, direct ultracentrifugation is costly and time-consuming, so clinical laboratories widely compute LDL-C using the Friedewald equation (published in 1972 by Dr. William Friedewald):

  • The 5:1 Triglyceride-to-VLDL Ratio: The formula presumes that virtually all circulating plasma triglycerides reside in Very Low-Density Lipoproteins (VLDL) at a fixed mass ratio of 5:1 (or 2.2:1 in mmol/L).
  • The 400 mg/dL Limit (Crucial Rule): When serum triglycerides exceed , the ratio breaks down because chylomicrons and remnant lipoproteins accumulate, causing Friedewald to severely underestimate true LDL-C. In such cases, laboratories must run a direct homogeneous enzymatic LDL assay.
  • Non-HDL Cholesterol: Recommended by AHA/ACC guidelines as a superior marker in patients with metabolic syndrome, diabetes, or elevated triglycerides, representing the sum of all atherogenic ApoB-containing lipoproteins).

How to Use This Calculator

Enter your Lipid Measurement Units — select from mg / dL (Standard US units), mmol / L (Standard SI units), Total Cholesterol (TC) (e.g. 210 mg/dL (or 5.43 mmol/L)), HDL 'Good' Cholesterol (HDL-C) (e.g. 50 mg/dL (or 1.29 mmol/L)), and Triglycerides (TG) (e.g. 150 mg/dL (or 1.69 mmol/L)). Results update instantly — no submit button needed. Use metric or imperial units as labeled. For the most accurate result, measure height and weight in the morning without shoes.

The Formula

Friedewald LDL-C & Lipid Fraction formulas:

In Conventional US Units (mg/dL):

VLDL-C = (Triglycerides) / (5)

LDL-C = Total Cholesterol - HDL-C - (Triglycerides) / (5)

Non-HDL-C = Total Cholesterol - HDL-C

In Standard SI Units (mmol/L):

VLDL-C = (Triglycerides) / (2.2)

LDL-C = Total Cholesterol - HDL-C - (Triglycerides) / (2.2)

Worked Example

For example, evaluating a fasting lipid panel with Total Cholesterol 210 mg/dL, HDL-C 50 mg/dL, and Triglycerides 150 mg/dL: Estimated VLDL-C is . Calculated Friedewald LDL-C is . Non-HDL cholesterol is .

Understanding Your Result

ACC/AHA lipid targets: LDL-C below 100 mg/dL (desirable); below 70 mg/dL for very high cardiovascular risk (established atherosclerotic disease). HDL-C above 40 mg/dL (men) and 50 mg/dL (women) is associated with lower cardiovascular risk; above 60 mg/dL is cardioprotective. Triglycerides below 150 mg/dL normal; 150–499 borderline to high; 500+ is very high and carries pancreatitis risk. Non-HDL cholesterol (total minus HDL) is a better cardiovascular risk predictor than LDL alone in people with high triglycerides.

💡 Expert Health Guidance & Clinical Context

  • This calculator uses clinically validated formulas and population reference data published by the WHO and NIH. Results are screening estimates, not medical diagnoses.
  • Consult a licensed healthcare provider before making any changes to diet, medication, or exercise based on these results — individual variation is significant.
  • Genetics, chronic conditions, and concurrent medications can dramatically affect what a "normal" result means for a specific individual.
  • Track your results over time: a single data point is less meaningful than a trend measured consistently across multiple weeks or months.
  • The CDC recommends adults receive routine health screenings at least annually. Use these calculations to prepare informed questions for your physician.
  • Body composition, lifestyle factors, and stress levels all interact with the metrics shown here. No single number captures your full health picture.
  • For pediatric or geriatric populations, reference ranges may differ significantly from the adult standards used in general calculators.
  • Always cross-reference results with laboratory tests, clinical examinations, and professional medical evaluation before acting on any finding.
Sources: WHO Health Guidelines · CDC Clinical Resources · NIH MedlinePlus

Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.

❓ Frequently Asked Questions

How does the Friedewald equation calculate LDL cholesterol?
Friedewald calculates LDL by subtracting HDL cholesterol and estimated VLDL cholesterol from Total Cholesterol: LDL = TC - HDL -.

When is the Friedewald formula inaccurate?
The formula is invalid when Triglycerides are 400 mg/dL or higher, in non-fasting blood samples with severe chylomicronemia, or in patients with Type III dysbetalipoproteinemia.

What is Non-HDL cholesterol and why is it important?
Non-HDL is calculated as Total Cholesterol minus HDL. It measures all atherogenic, plaque-forming lipoproteins (LDL, VLDL, IDL, Lp(a)) and is especially predictive of cardiovascular risk in diabetic patients.

What is an optimal LDL cholesterol level?
For healthy adults, an LDL level below 100 mg/dL is optimal. For individuals with established cardiovascular disease, diabetes, or high cardiovascular risk, the target is below 70 mg/dL or below 55 mg/dL.

How do you convert cholesterol from mg/dL to mmol/L?
To convert Total, HDL, or LDL cholesterol from mg/dL to mmol/L, divide by 38.67. To convert Triglycerides from mg/dL to mmol/L, divide by 88.57.

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