mmol/L to mg/dL Converter
Common Conversions
| mmol/L | mg/dL |
|---|---|
| 0.1 | MW/100 |
| 0.5 | MW/20 |
| 1 | MW/10 |
| 2 | MW/5 |
| 5 | MW/2 |
| 10 | MW |
| 20 | 2×MW |
| 50 | 5×MW |
| 100 | 10×MW |
| 200 | 20×MW |
| 500 | 50×MW |
| 1000 | 100×MW |
Why this conversion matters in chemistry
Multi-center international clinical-trial data harmonization is one of the everyday contexts. Fasting plasma glucose at 5.55 mmol/L on an SI-convention international report is 100 mg/dL on a US clinical-laboratory report — the conversion uses the glucose molar mass (180.16 g/mol). The factor combines the milli prefix (1000) with the deciliter relation (10), netting MW/10. In practice, this is the unit handoff between SI-aligned international clinical reporting and traditional US mass-based clinical-chemistry units.
Formula
mg/dL = mmol/L × MW ÷ 10
Worked Examples
5.5 mmol/L (glucose, MW 180) = 99 mg/dL
Normal fasting glucose — the standard clinical reference.
1 mmol/L (general) = MW/10 mg/dL
The general formula expressed per mmol/L unit.
7.0 mmol/L (glucose) = 126 mg/dL
Diabetes diagnostic threshold for fasting plasma glucose.
2.0 mmol/L (cholesterol, MW 387) = 77.4 mg/dL
About a low-end cholesterol concentration in mg/dL.
Frequently Asked Questions
How do I convert mmol/L to mg/dL?
Multiply by molecular weight and divide by 10. For glucose (MW 180): 5.5 mmol/L × 180 / 10 = 99 mg/dL. The MW carries the bridge from moles to mass.
Why does this conversion need molecular weight?
mmol/L is a molar concentration (moles per volume); mg/dL is a mass concentration. Converting between them requires the molar mass to bridge mass and moles. The /10 factor handles the dL versus L unit step.
What are common MW values for clinical analytes?
Glucose 180.16, cholesterol 386.65, creatinine 113.12, urea 60.06 g/mol. Memorizing two or three of these covers most routine clinical-chemistry conversions between SI and US units.