🫀 Cholesterol Ratio Calculator – Understand Your Lipid Balance
The Cholesterol Ratio Calculator helps you interpret the results of a standard lipid panel by computing the most clinically relevant ratios: the Total Cholesterol-to-HDL (TC:HDL) ratio, the LDL:HDL ratio, and the non-HDL:HDL ratio. Rather than looking at each cholesterol number in isolation, these ratios give a more complete picture of how well your "good" cholesterol balances your overall lipid burden.
🧪 What Is the TC:HDL Ratio?
The TC:HDL ratio divides your total cholesterol by your HDL (high-density lipoprotein) value. HDL is often called "good" cholesterol because it transports excess cholesterol away from the arteries back to the liver. A lower ratio indicates a more favorable lipid profile.
TC:HDL Ratio = Total Cholesterol ÷ HDL
Example: 190 mg/dL ÷ 55 mg/dL = 3.45
📊 Risk Reference Bands
These general reference bands are commonly used to contextualize TC:HDL results. They are informational only — individual risk depends on many additional clinical factors.
Favorable
Excellent lipid balance; low cardiovascular risk indicator.
Near-Optimal
Generally acceptable; room for lifestyle improvements.
Borderline High
Warrants attention; discuss with a healthcare provider.
High Risk
Associated with elevated cardiovascular risk; medical review advised.
🔢 Additional Ratios Explained
LDL:HDL Ratio
When you provide your LDL (low-density lipoprotein) value, the calculator also computes the LDL:HDL ratio. LDL is the primary carrier of cholesterol into arterial walls. A ratio below 2.0 is generally considered favorable; above 3.5 is considered elevated. LDL is optional because not all lipid panels directly measure it.
Non-HDL Cholesterol & Non-HDL:HDL Ratio
Non-HDL cholesterol equals Total Cholesterol minus HDL. It captures all atherogenic lipoproteins — including LDL, VLDL, and IDL — in a single value. Many guidelines now consider non-HDL a more comprehensive risk marker than LDL alone, especially for people with elevated triglycerides. The non-HDL:HDL ratio then expresses how this atherogenic burden compares to protective HDL.
Non-HDL = Total Cholesterol − HDL
Non-HDL:HDL = Non-HDL ÷ HDL
Example: (190 − 55) ÷ 55 = 135 ÷ 55 = 2.45
⚖️ mg/dL vs mmol/L
Lipid panels use different units depending on the country. The United States, Canada, and many Asian countries report cholesterol in mg/dL, while the United Kingdom, Europe, and Australia typically use mmol/L. This calculator supports both units. When you switch units, all entered values are automatically converted using the factor 38.67 (mg/dL ÷ 38.67 = mmol/L). Ratios are always unitless.
💡 What-If Scenario Testing
The what-if section lets you explore how your TC:HDL ratio would change if your HDL improved or your total cholesterol decreased. For example, if your HDL rose from 55 to 65 mg/dL through exercise or dietary changes, the calculator shows you the projected ratio alongside the delta (change). This makes the abstract goal of "improving your lipid profile" concrete and motivating.
📋 How to Use This Calculator
- Select your lipid unit (mg/dL or mmol/L) matching your lab report.
- Enter your Total Cholesterol and HDL values — these are required.
- Optionally enter LDL to unlock the LDL:HDL ratio.
- Optionally enter what-if values to test hypothetical improvements.
- Click Calculate to see all ratios, interpretation, and composition bar.
- Copy, download, or share your results for discussion with your doctor.
🔬 Formulas Used
TC:HDL ratio = Total Cholesterol / HDL
LDL:HDL ratio = LDL / HDL
Non-HDL = Total Cholesterol − HDL
Non-HDL:HDL ratio = (Total Cholesterol − HDL) / HDL
mg/dL to mmol/L: value / 38.67
mmol/L to mg/dL: value × 38.67