Browse Medical Laboratory Calculators
Cholesterol HDL Unit Converter
High-Density Lipoprotein (HDL) cholesterol is often referred to as “good” cholesterol. It acts as a scavenger, carrying LDL (low-density lipoprotein) cholesterol away from the arteries and back to the liver, where it is broken down and passed from the body. This process is known as reverse cholesterol transport.[Image of lipoprotein metabolism and reverse cholesterol transport]
Clinically, HDL levels are inversely related to the risk of coronary heart disease. Low levels of HDL (< 40 mg/dL in men, < 50 mg/dL in women) are an independent risk factor for cardiovascular events, whereas high levels (> 60 mg/dL) are considered cardioprotective. HDL measurement is a standard component of the lipid panel used for cardiovascular risk stratification. This converter allows seamless switching between the US standard (mg/dL) and the international SI unit (mmol/L).
SI Units
RecommendedMillimoles per liter (Standard International).
Conventional Units
Clinical Context
Target Levels: For metabolic health, HDL levels should ideally be > 40 mg/dL (1.0 mmol/L) for men and > 50 mg/dL (1.3 mmol/L) for women.
Values above 60 mg/dL (1.55 mmol/L) are considered protective against heart disease. Extremely high levels (> 90-100 mg/dL) are rare and may sometimes be associated with genetic mutations that are not necessarily protective. The conversion factor relies on the molecular weight of cholesterol: 1 mmol/L ≈ 38.67 mg/dL.
Clinical References
How to Use This Calculator
Follow these steps to get accurate clinical conversions instantly.
Enter Values
Input your laboratory results into the corresponding unit field (e.g., mg/dL). You can use either dot or comma decimals.
Automatic Conversion
The calculator works in real-time. As you type in one field, all other units (like mmol/L) are instantly updated.
Verify Units
Check the SI Units section. mmol/L is the standard unit in Canada and Europe.
Reset
Use the Clear button to reset all fields before starting a new calculation.
Frequently Asked Questions & Tips
Ideally, > 60 mg/dL (1.55 mmol/L) is considered protective against heart disease.
HDL is less affected by food than triglycerides, but a standard lipid panel usually requires fasting.