Free tool
Cholesterol Ratio Calculator
Your cholesterol ratio — total cholesterol divided by HDL — is one of the strongest predictors of cardiovascular risk on a standard lipid panel, and it's often more informative than LDL alone. Enter your latest numbers below to calculate it.
This calculator is for informational purposes only and is not a substitute for medical advice. Always consult your doctor about your lab results.
How the Cholesterol Ratio Is Calculated
The formula is simple: Total Cholesterol ÷ HDL Cholesterol. A lower ratio is better — it means you have more "good" HDL relative to your total cholesterol.
| Ratio | Category |
|---|---|
| 3.5 or below | Optimal |
| 3.5 – 4.5 | Good |
| 4.5 – 6.0 | Borderline high |
| Above 6.0 | High |
Why the Ratio Matters More Than LDL Alone
Two people can have identical LDL and very different risk, depending on their HDL. Someone with LDL 130 and HDL 65 has a ratio of roughly 3.0 — optimal. Someone with the same LDL but HDL 35 has a ratio closer to 5.6 — borderline high. The ratio captures that difference; LDL alone doesn't.
What Improves Your Ratio
Regular aerobic exercise
The most effective way to raise HDL, which directly lowers the ratio
Reduce sugar and refined carbohydrates
Lowers triglycerides and total cholesterol
Replace saturated fat with unsaturated fat
Lowers total cholesterol without lowering HDL
Lose weight if overweight
Improves both total cholesterol and HDL