Cholesterol Unit Converter – mg/dL to mmol/L Made Simple
Blood lipid panels are reported in two different unit systems depending on where you live. Laboratories in the United States report cholesterol values in mg/dL (milligrams per deciliter), while most of the rest of the world — including the UK, Canada, Australia, and the European Union — uses mmol/L (millimoles per liter). If you've ever traveled, switched healthcare providers, or read a clinical study from another country, you've likely run into a result you couldn't immediately interpret. This Cholesterol Unit Converter instantly translates between the two so you can understand your numbers no matter where they came from.
How the Conversion Works
Cholesterol, along with its related lipid fractions — LDL, HDL, VLDL, and Triglycerides — is converted using a single, scientifically derived factor based on cholesterol's molar mass of 386.65 g/mol. To go from mg/dL to mmol/L, multiply by 0.02586. To reverse the conversion, multiply by 38.6717. For example, a Total Cholesterol reading of 200 mg/dL converts to approximately 5.18 mmol/L. This tool performs that arithmetic instantly and lets you choose how many decimal places (0–4) to display.
Supported Lipid Types
The converter handles all five common lipid panel measurements: Total Cholesterol, LDL (low-density lipoprotein, often called "bad" cholesterol), HDL (high-density lipoprotein, the "good" cholesterol), VLDL (very-low-density lipoprotein), and Triglycerides. Each lipid type uses the same numeric conversion factor, but a different clinical reference range, since "normal" and "high" mean different things depending on which fraction you're looking at.
Risk Classification Based on AHA/ACC Guidelines
Beyond simple unit conversion, the tool classifies your converted value into a clinical risk category — Optimal, Desirable, Borderline High, High, or Very High — using thresholds commonly cited by the American Heart Association and American College of Cardiology (AHA/ACC). For HDL specifically, the "low risk" threshold differs by sex: below 40 mg/dL for men versus below 50 mg/dL for women, reflecting natural physiological differences in HDL levels between sexes.
Full Lipid Panel Mode
Most lab reports list four values together: Total Cholesterol, LDL, HDL, and Triglycerides. Instead of converting each one individually, switch on Full Lipid Panel Mode to enter all four values at once. The tool converts every value to your target unit and displays individual risk badges for each, so you get a complete picture of your panel in a single table.
1–2000 mg/dL or 0.03–51.7 mmol/L) trigger a warning, since such values are almost always a data-entry or unit error rather than a real reading.Why Unit Differences Matter
Mixing up mg/dL and mmol/L can lead to serious misunderstandings. A value of 5.2 means something completely different depending on the unit — it's a healthy mmol/L reading for Total Cholesterol, but a mg/dL value that low would be alarmingly low and likely indicate a measurement error. This converter removes that ambiguity by always showing both the original and converted value side by side, along with the exact conversion factor used, so you can verify the math yourself.
Who This Tool Is For
This converter is useful for patients reviewing lab results from a different country, clinicians and nurses working across health systems that use different reporting standards, students studying lipidology or clinical chemistry, and anyone maintaining a personal health record who wants consistent units across multiple lab reports over time.