Cholesterol Ratio Calculator Formula
Understand the math behind the cholesterol ratio calculator. Each variable explained with a worked example.
Formulas Used
LDL (Calculated)
ldl_calculated = total_chol - hdl - triglycerides / 5Total/HDL Ratio
chol_ratio = total_chol / hdlNon-HDL Cholesterol
non_hdl = total_chol - hdlVariables
| Variable | Description | Default |
|---|---|---|
total_chol | Total Cholesterol(mg/dL) | 200 |
hdl | HDL (Good) Cholesterol(mg/dL) | 55 |
triglycerides | Triglycerides(mg/dL) | 150 |
How It Works
Cholesterol Calculations
Friedewald Equation for LDL
LDL = Total Cholesterol - HDL - (Triglycerides / 5)
This estimate is accurate when triglycerides are below 400 mg/dL.
Cholesterol Ratio
Ratio = Total Cholesterol / HDL
A ratio below 5 is desirable. Below 3.5 is optimal.
Target Ranges
Worked Example
Total cholesterol 200, HDL 55, triglycerides 150 mg/dL.
- 01LDL = 200 - 55 - (150 / 5) = 200 - 55 - 30 = 115 mg/dL
- 02Ratio = 200 / 55 = 3.6
- 03Non-HDL = 200 - 55 = 145 mg/dL
Frequently Asked Questions
What is a good cholesterol ratio?
A total-to-HDL ratio below 5 is considered acceptable. Below 3.5 is optimal. Higher ratios indicate greater cardiovascular risk.
How accurate is the Friedewald equation?
It is accurate when triglycerides are under 400 mg/dL. For higher levels, a direct LDL measurement is needed.
How can I improve my cholesterol?
Regular exercise, a diet low in saturated fat, adequate fiber, maintaining healthy weight, and medications when prescribed can all improve cholesterol levels.
Ready to run the numbers?
Open Cholesterol Ratio Calculator