Select the analyte, enter a concentration in mg/dL (or µmol/L for the reverse), and the calculator returns the SI-unit equivalent using the substance’s molecular weight.
Related Calculators
- All Unit Converters
- Mmol/L to mg/dl Calculator
- µmol/L to mg/dL Calculator
- nmol/L to mg/dL Calculator
Formula
µmol/L = mg/dL × 10,000 ÷ MW
where MW = molecular weight of the substance in g/mol.
Reverse: mg/dL = µmol/L × MW ÷ 10,000
The factor 10,000 comes from converting dL to L (×10) and g to µg (×106), then dividing by MW to get micromoles.
Common Conversion Factors
Multiply mg/dL by the factor below to get µmol/L. Divide µmol/L by the factor to get mg/dL.
| Analyte | MW (g/mol) | mg/dL → µmol/L factor | Typical adult range |
|---|---|---|---|
| Creatinine | 113.12 | 88.4 | 53–115 µmol/L |
| Bilirubin (total) | 584.67 | 17.1 | 1.7–20.5 µmol/L |
| Uric acid | 168.11 | 59.5 | 202–416 µmol/L |
| Urea | 60.06 | 166.5 (as µmol/L) | 2.5–7.1 mmol/L |
| Glucose | 180.16 | 55.5 (use mmol/L) | 3.9–5.5 mmol/L |
| Cholesterol | 386.65 | 25.9 (use mmol/L) | < 5.17 mmol/L |
| Calcium | 40.08 | 249.5 (use mmol/L) | 2.12–2.62 mmol/L |
Interpretation
The µmol/L value is the molar concentration — how many micromoles of the substance sit in one liter of fluid. It scales inversely with molecular weight, so a heavy molecule like bilirubin gives a much smaller µmol/L number than a light one like creatinine at the same mg/dL. Compare the result to the analyte’s reference range, not to the mg/dL range, since the numeric scale is different. The calculator flags whether your value falls below, within, or above a typical adult range for the selected analyte.
- Within range: result sits inside the reference interval shown.
- Above range: may indicate elevated concentration — clinical context decides significance.
- Below range: may indicate deficiency, dilution, or lab/sample variation.
Reference intervals vary by lab, age, sex, and method. Use the posted range from your own lab report for clinical decisions.
FAQ
Why does each analyte need a different conversion factor?
Because mg measures mass and µmol measures moles. Converting between them requires dividing by molecular weight, which is unique to each compound.
When should I use mmol/L instead of µmol/L?
For glucose, cholesterol, urea, and calcium, SI results are conventionally reported in mmol/L (µmol/L ÷ 1000). The calculator shows the mmol/L equivalent below the main result.
What if my lab reports a value I don’t see listed?
Choose “Custom molecular weight” and enter the MW in g/mol. The same formula applies to any substance measured by mass per volume.
Is mg/dL the same as mg%?
Yes. “mg%” is an older notation for milligrams per 100 mL, which equals mg/dL. Use the value directly without additional conversion.
