Cholesterol Units Converter mg/dL ↔ mmol/L. Value (mg/dL) mmol/L (mmol/L) 5.172 Step-by-step with your numbers: 1. Values used: 2. Value = 200 mg/dL 3. mmol/L = 5.172mmol/L Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! Multiply mmol/L by 38.67 for mg/dL. FAQ Triglycerides? Divide mg/dL by 88.57 for TG in mmol/L. Related calculators LDL Calculator (Friedewald) LDL = Total − HDL − (TG/5). Cholesterol Ratio Calculator Total cholesterol / HDL. Blood Sugar Converter mg/dL ↔ mmol/L.