The Martin LDL calculator estimates LDL cholesterol using the Martin/Hopkins approach, which uses an adjustable triglyceride divisor instead of a fixed value. This can improve precision, especially when triglycerides are elevated or LDL is low.
What is the Martin LDL calculation?
Traditional LDL estimation often uses the Friedewald equation: LDL = Total Cholesterol - HDL - (Triglycerides/5) in mg/dL. The Martin method replaces the fixed /5 with a personalized factor derived from triglycerides and non-HDL cholesterol. That makes the estimate more flexible and often more accurate in real-world lab profiles.
Core equation
LDL-C = Total Cholesterol - HDL-C - (Triglycerides / Adjustable Factor)
Where Non-HDL-C = Total Cholesterol - HDL-C, and the adjustable factor changes by lipid pattern.
Why this calculator can be useful
- Better handling of mixed lipid profiles compared with fixed-divisor equations.
- Helps when LDL values are near treatment targets and small differences matter.
- Provides both Martin-style and Friedewald-style estimates for side-by-side context.
How to use this martin ldl calculator
- Select your unit system (mg/dL or mmol/L).
- Enter total cholesterol, HDL cholesterol, and triglycerides.
- Click Calculate LDL.
- Review Martin estimate, optional Friedewald estimate, and non-HDL cholesterol.
Understanding your output
The result panel shows:
- Martin LDL estimate: primary value from the adjustable-factor method.
- Friedewald LDL estimate: shown when triglycerides are below 400 mg/dL.
- Non-HDL cholesterol: useful secondary marker in lipid management.
- Estimated category: a general LDL range classification.
Typical LDL reference ranges (mg/dL)
- < 100: Optimal (general population context)
- 100-129: Near optimal
- 130-159: Borderline high
- 160-189: High
- ≥ 190: Very high
Important limitations
No online tool replaces clinical interpretation. Lipid goals vary by cardiovascular risk, diabetes status, family history, age, and current therapies (including statins or non-statin agents). Very high triglycerides, acute illness, and non-fasting samples can also affect interpretation.
Educational use only: This page provides an estimate and should not be used as a diagnosis. Discuss results and treatment goals with a licensed clinician.
FAQ
Is this the same as a direct LDL blood test?
No. This is an estimated LDL value based on other lipid measurements. Direct LDL assays can be ordered in selected situations.
Can I use mmol/L values?
Yes. The calculator converts units internally and returns results in your selected unit format.
What if triglycerides are very high?
At high triglyceride levels, equation-based LDL estimates become less reliable. Clinical labs may recommend direct LDL or alternative markers.