Calculate LDL-C (Martin-Hopkins Method)
Enter your lipid panel values below. This tool estimates LDL cholesterol using an adjustable triglyceride-to-VLDL factor approach (Martin-Hopkins style) and also shows the Friedewald estimate for comparison.
What is the Martin-Hopkins LDL calculator?
The Martin-Hopkins LDL method is an improved way to estimate LDL cholesterol (LDL-C) from a standard lipid panel. Instead of using one fixed triglyceride divisor for everyone, it uses an adjustable factor based on your triglycerides and non-HDL cholesterol. This helps reduce estimation error, especially when triglycerides are higher or LDL is lower.
Why this method can be more useful than Friedewald
The classic Friedewald equation estimates LDL with a fixed term (TG/5 in mg/dL units). That assumption is simple, but it does not fit every patient well.
- Friedewald: LDL-C = Total Cholesterol - HDL-C - (Triglycerides/5)
- Martin-Hopkins style: LDL-C = Total Cholesterol - HDL-C - (Triglycerides / adjustable factor)
By using a variable factor, the Martin-Hopkins approach better reflects differences in triglyceride-rich lipoproteins across individuals.
How to use this calculator
Inputs you need
- Total cholesterol
- HDL cholesterol
- Triglycerides
- Units (mg/dL or mmol/L)
What you get
- Estimated LDL-C using Martin-Hopkins style calculation
- Friedewald LDL-C estimate for comparison
- Non-HDL cholesterol
- Selected triglyceride divisor used in the estimate
- A general LDL category label
Interpreting your LDL-C number
LDL interpretation depends on your cardiovascular risk profile, diabetes status, kidney disease, blood pressure, smoking status, family history, and whether you already have atherosclerotic cardiovascular disease (ASCVD). General reference categories often used in reports are:
- <100 mg/dL: Optimal (for many adults)
- 100–129 mg/dL: Near optimal / above optimal
- 130–159 mg/dL: Borderline high
- 160–189 mg/dL: High
- ≥190 mg/dL: Very high
Some people (for example, those with established ASCVD) may have lower individualized LDL targets.
Important limitations
- Estimated LDL-C can be less reliable when triglycerides are very high.
- Non-fasting samples may affect triglycerides in some individuals.
- Lab-to-lab variation and biologic variation can change values.
- This tool does not replace direct LDL measurement when clinically indicated.
FAQ
Is this a diagnosis tool?
No. It is an educational estimator. Diagnosis and treatment planning should come from your clinician.
Should I fast before a lipid test?
Many modern guidelines accept non-fasting lipid panels, but fasting may still be preferred in specific situations, particularly when triglycerides are elevated or follow-up precision is needed.
What if triglycerides are very high?
If triglycerides are markedly elevated, LDL estimation formulas become less reliable. Your clinician may order direct LDL-C, apolipoprotein B, or non-HDL-based risk assessment.
Medical disclaimer
This calculator is for informational and educational purposes only and is not medical advice. Always discuss lipid results and treatment decisions with a qualified healthcare professional.