Non-HDL Cholesterol Explained: Formula, Units, and How It Compares With LDL and ApoB
Every standard lipid panel contains the two numbers needed to compute Non-HDL cholesterol: Total Cholesterol and HDL Cholesterol. Here is why cardiometabolic guidelines emphasize it.
What Non-HDL Cholesterol Measures
When you subtract High-Density Lipoprotein cholesterol (HDL-C) from Total Cholesterol, the remainder is the cholesterol carried inside all atherogenic, Apolipoprotein-B-containing particles: Low-Density Lipoprotein (LDL), Very-Low-Density Lipoprotein (VLDL), Intermediate-Density Lipoprotein (IDL), chylomicron remnants, and Lipoprotein(a).
Formula: Non-HDL Cholesterol = Total Cholesterol − HDL Cholesterol (in matching mg/dL or mmol/L units).
| Lipid Marker | What It Measures | Requires Fasting? | Affected by High Triglycerides? |
|---|---|---|---|
| Calculated LDL-C (Friedewald) | Estimated cholesterol mass in LDL particles | Yes (traditionally) | Yes — less accurate when TG >= 150–400 mg/dL |
| Non-HDL Cholesterol | Total cholesterol mass in all atherogenic particles (LDL + VLDL + remnants) | No | No — direct subtraction (Total − HDL) |
| Apolipoprotein B (ApoB) | Direct particle count of all atherogenic lipoproteins (1 ApoB per particle) | No | No — direct immunoassay |
Limitations and When to Seek Medical Care
- Lipid reference thresholds depend on individualized cardiovascular risk assessment by your clinician.
Related Calculators
Non-HDL Cholesterol Calculator
Calculate Non-HDL cholesterol by subtracting HDL ("good") cholesterol from Total Cholesterol in matching units (mg/dL or mmol/L), with companion unit conversion.
TyG Index Calculator (Triglyceride-Glucose Index)
Calculate the logarithmic Triglyceride-Glucose (TyG) index from fasting triglycerides and fasting glucose, with automatic unit conversion when labs are entered in mmol/L.
HOMA-IR Calculator (Homeostatic Model Assessment)
Compute the Homeostatic Model Assessment for Insulin Resistance (HOMA-IR) from a paired morning fasting blood draw using the published Matthews et al. (1985) equation.
Frequently Asked Questions
How do I convert Non-HDL cholesterol between mg/dL and mmol/L?
Divide mg/dL by 38.67 to get mmol/L, or multiply mmol/L by 38.67 to get mg/dL.
Sources and Review Information
- [AHA-LIPID] Grundy SM, Stone NJ, Bailey AL, et al. AHA/ACC Multisociety Guideline on the Management of Blood Cholesterol (Non-HDL Cholesterol = Total Cholesterol minus HDL-C). Circulation. 2019;139(25):e1082-e1143. Reference Source
Prepared by: GlucoBP Editorial & Engineering Team · Verification status: Formula verified against published reference; clinical review pending · Last updated: 2026-11-15