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

· Last updated：2026-08-13

This tool is for informational purposes only and does not constitute medical, financial, or legal advice; consult a qualified professional for advice.

Convert serum bilirubin (total/direct/indirect) between mg/dL and µmol/L. Factor 17.1 (molar mass 584.67 g/mol). Derived from Young 1987, StatPearls, AAP 2004, Bhutani. Not medical advice.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Health
Input types
number, select
Output type
json
Sample coverage
4
API ready
Yes

Overview

Convert a serum bilirubin value between mg/dL and µmol/L using the fixed factor 17.1, with control over the number of decimal places. The converter supports total, direct, and indirect bilirubin values and is not medical advice.

When to use

  • Convert a bilirubin result from mg/dL to the SI unit µmol/L.
  • Convert a laboratory value from µmol/L to mg/dL for comparison with another report.
  • Standardize total, direct, or indirect bilirubin results before reviewing or documenting them.

How it works

  1. 1Enter the bilirubin value in the Value field.
  2. 2Select the input unit, mg/dL or µmol/L, as the Source Unit.
  3. 3Select the required output unit as the Target Unit.
  4. 4Choose the number of decimal places from 0 to 8, then read the JSON conversion result.

Use cases

  • Translate bilirubin results between conventional and SI units in laboratory medicine.
  • Compare values reported in different units across adult, pediatric, and neonatal records.
  • Prepare clearly formatted bilirubin measurements for clinical documentation or study notes.

Examples

1. Convert a jaundice-range result to SI units

Clinician or medical student

Background

A bilirubin result is reported as 2.5 mg/dL, but the receiving reference uses µmol/L.

Problem

Convert the value accurately while retaining two decimal places.

How to use

Enter 2.5 as Value, select mg/dL as Source Unit, select µmol/L as Target Unit, and set Decimal Places to 2.

value: 2.5; sourceUnit: mgdl; targetUnit: umol; decimalPlaces: 2

Outcome

The result is 42.75 µmol/L, calculated as 2.5 × 17.1.

2. Convert a neonatal bilirubin result to mg/dL

Pediatric care professional

Background

A neonatal bilirubin measurement is recorded as 340 µmol/L, while another document uses mg/dL.

Problem

Express the same measurement in mg/dL for consistent documentation.

How to use

Enter 340 as Value, select µmol/L as Source Unit, select mg/dL as Target Unit, and set Decimal Places to 2.

FAQ

What conversion factor does the tool use?

It uses 17.1: µmol/L = mg/dL × 17.1, and mg/dL = µmol/L ÷ 17.1.

Can I convert total, direct, and indirect bilirubin?

Yes. Enter the reported value for total, direct, or indirect bilirubin; the conversion uses the same unit factor.

Which units are supported?

The tool converts between mg/dL and µmol/L.

Can I choose the rounding precision?

Yes. Set Decimal Places from 0 to 8. The default is 2 decimal places.

Is this converter medical advice?

No. It only converts units. Discuss bilirubin results and clinical decisions with a qualified healthcare professional.

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value: 340; sourceUnit: umol; targetUnit: mgdl; decimalPlaces: 2

Outcome

The result is 19.88 mg/dL, calculated as 340 ÷ 17.1.