Bilirubin Unit Converter (mg/dL ↔ µmol/L)

Health Updated 14 Jun 2026

Convert bilirubin levels between mg/dL and µmol/L, the two units used on liver function and jaundice lab reports. The conversion uses bilirubin's molar mass factor: µmol/L = mg/dL × 17.1, and mg/dL = µmol/L ÷ 17.1. Choose a direction and enter your value to convert instantly.

Rates and fees change frequently. Always confirm the current figures with the official authority before relying on this result.
  • Conversion uses the bilirubin molar mass factor of 17.1.

Formula

µmol/L = mg/dL × 17.1; mg/dL = µmol/L ÷ 17.1
  • µmol/L = mg/dL × 17.1; to go the other way, mg/dL = µmol/L ÷ 17.1.
  • The factor 17.1 comes from bilirubin's molar mass (about 584.7 g/mol).
  • For reference, normal total bilirubin is roughly 0.3–1.2 mg/dL (about 5–21 µmol/L), though lab ranges vary.
  • mg/dL is common in the US; µmol/L (SI units) is used in most other countries.
  • This is a unit conversion only — interpret bilirubin results with the rest of the clinical picture.

1 mg/dL to µmol/L

Inputs
  • Bilirubin Value: 1
  • Convert: to

1 mg/dL × 17.1 = 17.1 µmol/L. A reported 2 mg/dL would be about 34.2 µmol/L.

Frequently asked questions

How do I convert bilirubin from mg/dL to µmol/L?
Multiply the mg/dL value by 17.1. For example, 1.2 mg/dL × 17.1 ≈ 20.5 µmol/L.
How do I convert µmol/L back to mg/dL?
Divide the µmol/L value by 17.1. For example, 34.2 µmol/L ÷ 17.1 = 2 mg/dL.
Where does the factor 17.1 come from?
It's derived from bilirubin's molar mass (≈ 584.7 g/mol), which links mass concentration (mg/dL) to molar concentration (µmol/L).
What is a normal bilirubin level?
Total bilirubin is typically about 0.3–1.2 mg/dL (5–21 µmol/L), but always check your lab's reference range and discuss results with a clinician.

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