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Creatinine mg/dL to µmol/L Converter

Enter a creatinine value and pick a direction to convert between mg/dL and µmol/L.

How it is calculated

One fixed factor is used in both directions: µmol/L = mg/dL × 88.42 and mg/dL = µmol/L ÷ 88.42. The direction setting decides which formula applies; any unrecognised direction value falls back to mg/dL to µmol/L. The result is rounded to two decimals, and the line labelled "reverse" simply repeats your input with its unit. Zero is accepted, a negative value returns no result. The factor comes from the molar mass of creatinine and is the same in every country; only the unit used in reports differs by country and laboratory. This is a unit conversion, not an interpretation of whether a value is normal.

Worked example

A lab report shows creatinine 1.2 mg/dL and you need µmol/L. Multiply: 1.2 × 88.42 = 106.104, shown as 106.10 µmol/L. Going back the other way, 106 µmol/L ÷ 88.42 = 1.1988, which the tool shows as 1.20 mg/dL. The small difference is rounding of the 106.

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Common mistakes

  • Leaving the direction on mg/dL to µmol/L when the number you typed is already in µmol/L, for example 106; the answer comes out as 9,372.52 µmol/L.
  • Using a rounded factor like 88 or 90 by hand; over a value of 100 µmol/L that already moves the answer by a few units.
  • Reading a bare number like 1.0 without its unit. The same digits mean a normal-looking value in mg/dL and a very low one in µmol/L, so always check which unit the lab used.
  • Confusing creatinine with creatine, or with creatinine clearance, which is in mL/min and cannot be converted with this factor.
  • Converting a value and then comparing it with a reference range given in the other unit without converting the range too.

Sources

About this calculator

Serum creatinine, a breakdown product of muscle creatine phosphate cleared by the kidneys, is one of the most common markers of kidney function, and it is reported in different units depending on the country: mg/dL in the United States, µmol/L (the SI unit) almost everywhere else. Because creatinine's molecular weight is 113.12 g/mol, the two are related by a fixed factor: 1 mg/dL = 88.42 µmol/L.

Mixing up the units is a genuine clinical risk — a value of ‘1.0’ means something completely different in mg/dL versus µmol/L, and eGFR formulas (like CKD-EPI or MDRD) require the correct unit as input. This converter switches a creatinine value between mg/dL and µmol/L in either direction using the standard 88.42 factor; it is informational only and not a substitute for a clinician's interpretation.

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  • Editorial team

    For a quick mental check, 1 mg/dL is about 88 micromoles per litre, so 100 micromoles per litre is roughly 1.13 mg/dL. When a reference interval is printed on a report, convert the interval as well, because it depends on the laboratory and the method. This is a unit conversion only, not an interpretation. Which direction do you convert more often, and from which kind of report?

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