How do I convert mg/dL to mmol/L?

Divide by the marker’s factor. For glucose divide by 18.02, for cholesterol (total, LDL, HDL) by 38.67, for triglycerides by 88.57, for creatinine multiply by 88.4 to get µmol/L. The factor differs because each molecule has a different weight, so there is no single mg/dL to mmol/L number.

Why do labs use different units?

The US mostly uses conventional units (mass per volume, like mg/dL). Most other countries use SI units (amount of substance per volume, like mmol/L). The result is the same; only the scale changes. The reference range on your report is always in the unit printed next to it.

Is ng/mL the same as µg/L?

Yes, they are the same number, as are pg/mL and ng/L, µIU/mL and mIU/L, and ×10³/µL and ×10⁹/L. Only the spelling differs.

Blood test unit converter

US labs print most results in conventional units (mg/dL, ng/mL); UK, European and Gulf labs print SI units (mmol/L, nmol/L). The factor depends on the marker, because it comes from each molecule’s weight: glucose is 18.02 mg/dL per mmol/L, cholesterol 38.67, triglycerides 88.57. Pick the marker, type the number and see it in every unit.

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Blood test unit converter

Marker

Value

Unit on your report

The same result in every unit

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1 mmol/L = 18.02 mg/dL

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Every marker and its conversion factor

Fasting Glucose Normal range

mg/dL · mmol/L

1 mmol/L = 18.02 mg/dL

Fasting Insulin Normal range

µIU/mL · pmol/L

1 pmol/L = 0.1667 µIU/mL

HbA1c Normal range

% · mmol/mol

mmol/mol = (% − 2.15) × 10.929

Apolipoprotein B Normal range

mg/dL · g/L

1 g/L = 100 mg/dL

Apolipoprotein A1 Normal range

mg/dL · g/L

1 g/L = 100 mg/dL

HDL Normal range

mg/dL · mmol/L

1 mmol/L = 38.67 mg/dL

LDL Normal range

mg/dL · mmol/L

1 mmol/L = 38.67 mg/dL

Total Cholesterol Normal range

mg/dL · mmol/L

1 mmol/L = 38.67 mg/dL

Triglycerides Normal range

mg/dL · mmol/L

1 mmol/L = 88.57 mg/dL

VLDL Normal range

mg/dL · mmol/L

1 mmol/L = 38.67 mg/dL

25-Hydroxy Vitamin D3 Normal range

ng/mL · nmol/L

1 nmol/L = 0.4006 ng/mL

Vitamin B12 Normal range

pg/mL · pmol/L

1 pmol/L = 1.355 pg/mL

Vitamin B9 (Folate)Normal range

ng/mL · nmol/L

1 nmol/L = 0.4413 ng/mL

Calcium Normal range

mg/dL · mmol/L

1 mmol/L = 4.008 mg/dL

Magnesium Normal range

mg/dL · mmol/L

1 mmol/L = 2.43 mg/dL

Total Iron Normal range

µg/dL · µmol/L

1 µmol/L = 5.587 µg/dL

Hs-CRP Normal range

mg/L · mg/dL

1 mg/dL = 10 mg/L

Homocysteine Normal range

µmol/L · mg/L

1 mg/L = 7.407 µmol/L

Haemoglobin Normal range

g/dL · g/L · mmol/L

1 g/L = 0.1 g/dL · 1 mmol/L = 1.611 g/dL

Total WBC Count Normal range

K/µL · cells/µL

1 cells/µL = 0.001 K/µL

Platelet Count Normal range

K/µL · cells/µL · lakh/cumm

1 cells/µL = 0.001 K/µL · 1 lakh/cumm = 100 K/µL

Absolute Lymphocyte Count Normal range

cells/µL · ×10⁹/L

1 ×10⁹/L = 1,000 cells/µL

Absolute Monocyte Count Normal range

cells/µL · ×10⁹/L

1 ×10⁹/L = 1,000 cells/µL

Absolute Eosinophil Count Normal range

cells/µL · ×10⁹/L

1 ×10⁹/L = 1,000 cells/µL

Absolute Basophil Count Normal range

cells/µL · ×10⁹/L

1 ×10⁹/L = 1,000 cells/µL

MCHC Normal range

g/dL · g/L

1 g/L = 0.1 g/dL

Testosterone (Total)Normal range

ng/dL · nmol/L

1 nmol/L = 28.84 ng/dL

Testosterone (Free)Normal range

pg/mL · pmol/L

1 pmol/L = 0.2884 pg/mL

Dihydrotestosterone Normal range

ng/dL · nmol/L

1 nmol/L = 29.04 ng/dL

Estradiol Normal range

pg/mL · pmol/L

1 pmol/L = 0.2724 pg/mL

Cortisol Normal range

µg/dL · nmol/L

1 nmol/L = 0.0362 µg/dL

DHEA-S Normal range

µg/dL · µmol/L

1 µmol/L = 36.85 µg/dL

Anti-Mullerian Hormone Normal range

ng/mL · pmol/L

1 pmol/L = 0.1401 ng/mL

Serum Creatinine Normal range

mg/dL · µmol/L

1 µmol/L = 0.0113 mg/dL

Blood Urea Nitrogen Normal range

mg/dL · mmol/L

1 mmol/L = 2.801 mg/dL

Blood Urea Normal range

mg/dL · mmol/L

1 mmol/L = 6.006 mg/dL

Uric acid Normal range

mg/dL · µmol/L

1 µmol/L = 0.0168 mg/dL

SGPT (ALT)Normal range

U/L · µkat/L

1 µkat/L = 60 U/L

SGOT (AST)Normal range

U/L · µkat/L

1 µkat/L = 60 U/L

GGT Normal range

U/L · µkat/L

1 µkat/L = 60 U/L

Alkaline Phosphatase Normal range

U/L · µkat/L

1 µkat/L = 60 U/L

Albumin Normal range

g/dL · g/L

1 g/L = 0.1 g/dL

Globulin Normal range

g/dL · g/L

1 g/L = 0.1 g/dL

Total Globulin Normal range

g/dL · g/L

1 g/L = 0.1 g/dL

Direct Bilirubin Normal range

mg/dL · µmol/L

1 µmol/L = 0.0585 mg/dL

Indirect Bilirubin Normal range

mg/dL · µmol/L

1 µmol/L = 0.0585 mg/dL

Free T4 Normal range

ng/dL · pmol/L

1 pmol/L = 0.0777 ng/dL

Free T3 Normal range

pg/mL · pmol/L

1 pmol/L = 0.651 pg/mL

CPK (Creatine Phosphokinase)Normal range

U/L · µkat/L

1 µkat/L = 60 U/L

LDH (Lactate Dehydrogenase)Normal range

U/L · µkat/L

1 µkat/L = 60 U/L

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Questions

How do I convert mg/dL to mmol/L?: Divide by the marker’s factor. For glucose divide by 18.02, for cholesterol (total, LDL, HDL) by 38.67, for triglycerides by 88.57, for creatinine multiply by 88.4 to get µmol/L. The factor differs because each molecule has a different weight, so there is no single mg/dL to mmol/L number.
Why do labs use different units?: The US mostly uses conventional units (mass per volume, like mg/dL). Most other countries use SI units (amount of substance per volume, like mmol/L). The result is the same; only the scale changes. The reference range on your report is always in the unit printed next to it.
Is ng/mL the same as µg/L?: Yes, they are the same number, as are pg/mL and ng/L, µIU/mL and mIU/L, and ×10³/µL and ×10⁹/L. Only the spelling differs.

All blood test calculators

Reference ranges are general-population guidance compiled from common clinical laboratories, not a diagnosis. Lab-to-lab ranges differ. Always read your results with your doctor.