Cholesterol Ratio & LDL Calculator
Calculate your total cholesterol to HDL ratio, non-HDL cholesterol and a calculated LDL (Friedewald) from a standard lipid panel. Example: total 200, HDL 50 and triglycerides 150 give a ratio of 4.0, non-HDL of 150 and LDL of 120 mg/dL.
Type the problems from this lesson and check each step.
Show steps
How to use the Cholesterol Ratio & LDL Calculator
- Enter the values in the fields.
- Press Calculate to see the result with the steps shown.
Formula and method
Cholesterol ratio = total cholesterol / HDL. Non-HDL = total – HDL. Friedewald LDL = total – HDL – triglycerides / 5 (mg/dL, valid if triglycerides below 400).
Lipid reference ranges (mg/dL)
| Measure | Desirable | Borderline | High |
|---|---|---|---|
| Total cholesterol | Below 200 | 200 to 239 | 240+ |
| LDL | Below 100 | 130 to 159 | 160+ |
| HDL | 60+ (protective) | 40 to 59 | Below 40 low |
| Triglycerides | Below 150 | 150 to 199 | 200+ |
| Non-HDL | Below 130 | 160 to 189 | 190+ |
Cholesterol ratio categories
| Total / HDL | Meaning |
|---|---|
| Below 3.5 | Excellent |
| 3.5 to 4.9 | Good |
| 5.0 and above | Higher cardiovascular risk |
Example panels
| Total | HDL | TG | Ratio | LDL |
|---|---|---|---|---|
| 180 | 60 | 100 | 3.0 | 100 |
| 200 | 50 | 150 | 4.0 | 120 |
| 240 | 40 | 200 | 6.0 | 160 |
Limits
Ratios add context but treatment decisions use LDL, non-HDL, age, blood pressure and other risks together. This calculator is for education and is not medical advice. Decisions about testing and treatment belong with a qualified clinician.
Frequently asked questions
What is a good cholesterol ratio?
Below 5, ideally below 3.5.
How is cholesterol ratio calculated?
Total cholesterol divided by HDL.
What is non-HDL cholesterol?
Total minus HDL, covering all atherogenic particles.
How is LDL calculated?
Friedewald: total – HDL – triglycerides / 5.
When is the LDL formula invalid?
When triglycerides are 400 or higher.
Do I need to fast?
Often not required, but follow your clinician.
Sources
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