Biochemistry Creatinine Kidney Function

Creatinine Unit Converter

Convert creatinine between µmol/L, mmol/L, mg/dL, mg/L, and other commonly used laboratory units.

Published on: 2026-06-07 · Last updated: 2026-08-28

Enter Creatinine Value

You can enter a value in any supported unit.

What does this converter do?

This tool converts creatinine concentrations between µmol/L, mmol/L, mg/dL, mg/100mL, mg%, mg/L, and µg/mL. It is useful when laboratory reports use different unit systems. The conversion is specific to creatinine and must not be applied to urea, BUN, cystatin C, or another analyte.

Supported units

µmol/L · SI unit; also written as umol/L or mcmol/L mmol/L · SI multiple; rarely used for serum creatinine mg/dL · common conventional unit mg/100mL · same concentration as mg/dL mg% · historical notation equivalent to mg/dL mg/L · used in some laboratory reports µg/mL · same concentration as mg/L; also written as ug/mL or mcg/mL

Conversion formulas

µmol/L = mg/dL × 88.4
mg/dL = µmol/L ÷ 88.4
µmol/L = mg/L × 8.84
mg/L = µmol/L ÷ 8.84
mmol/L = µmol/L ÷ 1000
mg/100mL = mg/dL
mg% = mg/dL
µg/mL = mg/L

Example conversion

If creatinine = 10 mg/L, the equivalent concentration is approximately 88.4 µmol/L, 0.0884 mmol/L, and 1.0 mg/dL.

Important laboratory note

This calculator changes creatinine concentration units only. It does not calculate eGFR, creatinine clearance, or diagnose kidney disease. Serum and urine creatinine have different clinical uses and reference intervals, even when reported in the same concentration unit.

How to Convert Creatinine Units

For creatinine, 1 mg/dL is equivalent to 88.4 µmol/L. To convert mg/dL to µmol/L, multiply by 88.4. To convert µmol/L to mg/dL, divide by 88.4.

When creatinine is reported in mg/L, multiply by 8.84 to obtain µmol/L. Conversely, divide µmol/L by 8.84 to obtain mg/L.

Equivalent Creatinine Reporting Units

  • mg/dL, mg/100mL, and mg% represent the same numerical concentration.
  • mg/L and µg/mL are numerically equivalent.
  • 1 mmol/L equals 1000 µmol/L.
  • 10 mg/L equals 1 mg/dL and approximately 88.4 µmol/L.

Clinical Context and Limitations

Creatinine is a waste product associated with normal muscle metabolism and is commonly used as a filtration marker. Serum creatinine is frequently incorporated into equations that estimate glomerular filtration rate, but the concentration alone does not provide a complete assessment of kidney function.

Interpretation should consider the specimen type, laboratory method, local reference interval, and the patient’s clinical context.

  • Creatinine concentration may be influenced by muscle mass, age, diet, hydration, pregnancy, medications, and acute illness.
  • A creatinine result should not be converted directly into an eGFR without using a validated equation and the required patient variables.
  • Kidney assessment commonly combines serum creatinine-based eGFR with urine albumin measurement when clinically appropriate.
  • Reference intervals for serum creatinine must not be applied to urine creatinine results.

References and Conversion Standards

  1. Clinical Chemistry. Instructions to Authors: serum creatinine in mg/dL is converted from µmol/L by dividing by 88.4.
  2. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Chronic Kidney Disease Tests and Diagnosis.
  3. NIDDK. Clinical Measurements and eGFR Accuracy: factors affecting serum creatinine and estimated GFR.