Cholesterol Ratio and Non-HDL Calculator

Calculator

How we calculate it

Non-HDL cholesterol is total cholesterol minus HDL cholesterol. What remains is every cholesterol-carrying particle associated with plaque building up in artery walls — LDL, plus the cholesterol carried in triglyceride-rich remnant particles. That makes non-HDL a broader measure of atherogenic burden than LDL alone, and it needs no fasting sample. The 2026 ACC/AHA dyslipidemia guideline gives it a numeric goal at every risk tier — below 130 mg/dL in primary prevention with a PREVENT 10-year risk under 10%, below 100 mg/dL at 10% or above and in established cardiovascular disease, and below 85 mg/dL where that disease carries very high risk. Which tier applies is a clinical judgment that needs a risk estimate this tool does not produce. The total-to-HDL ratio divides total cholesterol by HDL; it is easy to compute and widely quoted, but it is not a treatment target in current major guidelines. If you also enter an LDL value, the tool derives remnant cholesterol as non-HDL minus LDL. All values are held internally in mg/dL and converted for display using 38.67 mg/dL per mmol/L for cholesterol fractions and 88.57 for triglycerides — different molecules with different molar masses, so a single conversion factor for both would be wrong.

Important limitations

• A ratio compresses two numbers into one and loses information. It can look reassuring because HDL is high while LDL and non-HDL remain raised, and poor because HDL is low while the atherogenic fractions are in range.
• Ratios are not a treatment target in current major guidelines, which base decisions on LDL or non-HDL cholesterol alongside overall cardiovascular risk.
• Raising HDL with medication has not been shown in randomized trials to reduce cardiovascular events, so a higher HDL does not straightforwardly mean lower risk. Very high HDL has been associated with higher risk in some populations.
• Lipid values shift with recent illness, pregnancy, thyroid function, alcohol intake, weight change and several medications. A single panel is a snapshot.
• The ranges shown are general adult orientation ranges, not goals. The 2026 ACC/AHA goals are set by risk tier and run lower; placing yourself in a tier needs a PREVENT risk estimate, which requires inputs this site deliberately never collects.
• How these numbers are acted on depends on your whole risk picture — age, blood pressure, smoking, diabetes and family history — not the lipid panel alone.