1 mg/dL bilirubin to µmol/L

About bilirubin and these units

Bilirubin is a pigment from the breakdown of red blood cells, reported on liver-function panels. Bilirubin appears in mg/dL on US lab reports and in µmol/L on UK, Canadian, Australian, and most European lab reports. The factor (17.10) reflects reporting in micromoles per liter.

Where the 17.10 conversion factor comes from

mg/dL is a mass-per-volume unit. µmol/L is a moles-per-volume (molar concentration) unit. To convert between them you need the molecular weight of the substance, because that determines how many moles of it fit into a given mass.

For bilirubin, the reference molecular weight is 584.66 g/mol. Working through the unit algebra:

• The factor is fixed by the molecular weight (584.66 g/mol) together with the mass and volume prefixes of the two units, since a molar concentration counts molecules and a mass concentration weighs them.
• For bilirubin this works out to 17.10 µmol/L per mg/dL (multiply mg/dL by 17.10 to get µmol/L).
• The inverse (µmol/L → mg/dL) is 0.0585.

Step-by-step: converting 1 mg/dL of bilirubin by hand

1. Start with the lab value: 1 mg/dL.
2. Look up the conversion factor for bilirubin: 17.10 µmol/L per mg/dL.
3. Multiply: 1 × 17.10 = 17.1.
4. Attach the SI unit: 17.1 µmol/L.

Inverse check: 17.1 µmol/L ÷ 17.10 = 1 mg/dL ✓.

Companion conversions for nearby bilirubin values

If your lab reported a number close to but not exactly 1 mg/dL, the table below covers the surrounding range so you don't need to re-run the arithmetic.

A note on precision

Clinical chemistry assays for bilirubin are typically precise to two or three significant figures. The exact factor 17.10 is itself a rounded number, and the molecular weight that produces it (584.66 g/mol) is conventionally rounded. So while the calculator displays 17.1 µmol/L for 1 mg/dL, reporting more decimal places than your original measurement supports is false precision.

Common questions

What is 1 mg/dL bilirubin in µmol/L?

1 mg/dL of bilirubin equals 17.1 µmol/L. The conversion factor for bilirubin is 17.10 (multiply mg/dL by 17.10 to get µmol/L).

How do I convert mg/dL to µmol/L for bilirubin?

bilirubin has a conversion factor of 17.10. Formula: 1 mg/dL × 17.10 = 17.1 µmol/L. Inverse: 17.1 µmol/L ÷ 17.10 = 1 mg/dL.

Why does bilirubin have a different conversion factor than other biomarkers?

Each biomarker's mg/dL ↔ µmol/L factor is set by its molecular weight, because µmol/L is a molar concentration. For bilirubin, the reference molecular weight is 584.66 g/mol, which gives a factor of 17.10.

Where is mg/dL used and where is µmol/L used?

Bilirubin appears in mg/dL on US lab reports and in µmol/L on UK, Canadian, Australian, and most European lab reports. The factor (17.10) reflects reporting in micromoles per liter.

How precise should I report the converted value?

Lab assays for bilirubin are typically precise to about two or three significant figures. Reporting more decimal places than your original measurement supports is false precision. For a reading of 1 mg/dL, 17.1 µmol/L is appropriate; further decimals are not.

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