LDL Cholesterol Calculator (Friedewald Equation)
Estimate LDL from total, HDL and triglycerides.
Enter your values
ⓘ Live results
Results
- Estimated LDL
- 126 mg/dL
- Non-HDL cholesterol
- 150 mg/dL
Quick answer
The Friedewald equation estimates LDL cholesterol when a direct LDL measurement is not available.
LDL = Total cholesterol - HDL - (Triglycerides / 5)
How to use the LDL Cholesterol Calculator (Friedewald Equation)
- 1Enter total cholesterol, HDL and triglycerides from the same fasting lipid panel.
- 2The Friedewald formula is inaccurate above 400 mg/dL triglycerides, where a direct LDL test should be used instead.
- 3This is an estimate for educational use — discuss actual lipid results and cardiovascular risk with your doctor.
Worked example
Using the values the calculator loads with:
Inputs
- Total cholesterol200 mg/dL
- HDL cholesterol50 mg/dL
- Triglycerides120 mg/dL
Results
- Estimated LDL126 mg/dL
- Non-HDL cholesterol150 mg/dL
Frequently asked questions
Why divide triglycerides by 5?
It approximates VLDL cholesterol content, which is roughly one-fifth of triglyceride level in mg/dL.
Is LDL the only number that matters?
No — total risk considers LDL, HDL, triglycerides, non-HDL and other cardiovascular risk factors together.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.