Medical Unit Conversion Calculator
Bidirectional conversions for commonly reported clinical laboratory values and blood-gas pressure
Version 1.0.0
Enter a value in either unit. The paired value updates locally. Concentrations and gas tensions cannot be negative.
Electrolytes
mmol/Lmg/dL
mmol/Lmg/dL
mmol/Lmg/dL
Renal / metabolic
mmol/L ureamg/dL BUN
µmol/Lmg/dL
Lipids
mmol/Lmg/dL
mmol/Lmg/dL
Liver
µmol/Lmg/dL
Endocrine / glucose
mmol/Lmg/dL
Blood gases
kPammHg
Haematology
g/Lg/dL
Latest conversion
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No clinical values are intentionally saved by this control.
Equations
Calcium
mg/dL = mmol/L × 4.0Reverse: mmol/L = mg/dL ÷ 4.0. Output precision: 1 decimal place in mg/dL; 2 in mmol/L.
Magnesium
mg/dL = mmol/L × 2.43Reverse: mmol/L = mg/dL ÷ 2.43. Output precision: 2 decimal places.
Phosphate (reported as phosphorus)
mg/dL = mmol/L × 3.1Reverse: mmol/L = mg/dL ÷ 3.1. Output precision: 2 decimal places.
Urea / blood urea nitrogen
mg/dL BUN = mmol/L urea × 2.8Reverse: mmol/L urea = mg/dL BUN ÷ 2.8. Output precision: 1 decimal place.
Creatinine
mg/dL = µmol/L ÷ 88.42Reverse: µmol/L = mg/dL × 88.42. Output precision: 2 decimal places in mg/dL; whole µmol/L.
Cholesterol
mg/dL = mmol/L × 38.67Reverse: mmol/L = mg/dL ÷ 38.67. Output precision: 1 decimal place.
Triglycerides
mg/dL = mmol/L × 88.57Reverse: mmol/L = mg/dL ÷ 88.57. Output precision: whole mg/dL; 1 decimal place in mmol/L.
Bilirubin
mg/dL = µmol/L × 0.0585Reverse: µmol/L = mg/dL ÷ 0.0585. Output precision: 2 decimal places in mg/dL; whole µmol/L.
Glucose
mg/dL = mmol/L × 18.0182Reverse: mmol/L = mg/dL ÷ 18.0182. Output precision: whole mg/dL; 1 decimal place in mmol/L.
Blood-gas pressure
mm Hg = kPa × 7.5Reverse: kPa = mm Hg ÷ 7.5. This preserves the legacy calculator's rounded clinical factor. Output precision: whole mm Hg; 1 decimal place in kPa.
Haemoglobin
g/dL = g/L ÷ 10Reverse: g/L = g/dL × 10. Output precision: 1 decimal place in g/dL; whole g/L.
References
- Thompson A, Taylor BN. Guide for the Use of the International System of Units (SI). NIST Special Publication 811. 2008 ed. Gaithersburg (MD): National Institute of Standards and Technology; 2008.
- Bureau International des Poids et Mesures. The International System of Units (SI Brochure). 9th ed. Sèvres: BIPM; 2019, updated 2025.
- Rifai N, Horvath AR, Wittwer CT, editors. Tietz Textbook of Clinical Chemistry and Molecular Diagnostics. 6th ed. St Louis (MO): Elsevier; 2018.