Convert total, LDL, HDL or non-HDL cholesterol between mg/dL and mmol/L. Select the test and original unit printed on your report. The tool changes units;it does not assign a risk category or treatment target.
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Formula and example
For cholesterol, 1 mmol/L ≈ 38.67 mg/dL. Divide mg/dL by 38.67 to obtain mmol/L; multiply mmol/L by 38.67 to obtain mg/dL. The factor applies to total, LDL, HDL and non-HDL cholesterol.
For example, total cholesterol 200 mg/dL is about 5.17 mmol/L. A value of 5.20 mmol/L is about 201.1 mg/dL. Inputs start blank; “Fill example” enters the 200 mg/dL example.
How to read a converted result
The number changes because the unit changes, not because your cholesterol has changed. Use the same unit when comparing earlier results. Consider the reference interval from your laboratory and your cardiovascular risk with a clinician. LDL and HDL have different clinical meanings.
Do not apply the cholesterol factor to triglycerides. They use a different conversion factor and are outside this tool. A converted result alone should not determine whether to start or stop medication or what target applies.
What to do next
Check the test name and original unit on the report. Put earlier results into the same unit before comparing them, and discuss the full lipid panel, follow-up and individual goals with your clinician.
Frequently asked questions
Does this factor apply to LDL and HDL?
Yes. LDL-C and HDL-C report cholesterol concentration, as do total and non-HDL cholesterol. Their medical interpretation differs.
Can I enter triglycerides?
No. Triglycerides have a different mg/dL–mmol/L conversion factor.
Does the conversion tell me whether the result is normal?
No. It only changes units. Use the reporting laboratory’s interval and review the rest of the lipid panel, medical history and risk factors.
Related resources
LDL and non-HDL calculator · Lipid panel guide · Health records · All calculators
Sources
CDC NHANES lipid data and conversion factor · NCBI Bookshelf lipid conversion table · NIH MedlinePlus: Cholesterol
Sources reviewed September 30, 2026. General information, not a diagnosis or substitute for medical care. No independent clinician review is claimed.