Unit converter for lab tests
Laboratories report in different units. Convert a value from your report into the units this reference uses — or the other way round.
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Conversion works both ways: change the number and pick a marker. Rounded to 2 decimal places.
Conversion factors
| Marker | From | To | Formula |
|---|---|---|---|
| Ferritin | ng/mL | µg/L | 1 ng/mL = 1 µg/L — the number stays the same, only the unit label changes. Ferritin is the rare case where the two systems match exactly. |
| Hemoglobin | g/dL | g/L | g/dL × 10 = g/L. Example: 14.0 g/dL = 140 g/L. |
| Blood glucose | mg/dL | mmol/L | mg/dL ÷ 18 = mmol/L. Example: 99 mg/dL = 5.5 mmol/L. |
| White blood cells (WBC) | cells/mcL | × 10⁹/L | cells/mcL ÷ 1,000 = value in × 10⁹/L. Example: 8,000 cells/mcL = 8.0 × 10⁹/L. |
| Red blood cells (RBC) | million cells/mcL | × 10¹²/L | 1 million cells/mcL = 1 × 10¹²/L — the number stays the same, only the unit label changes between report formats. |
| Platelets (PLT) | cells/mcL | × 10⁹/L | cells/mcL ÷ 1,000 = value in × 10⁹/L. Example: 250,000 cells/mcL = 250 × 10⁹/L. |
| Bilirubin | mg/dL | µmol/L | mg/dL × 17.1 = µmol/L. Example: 1.0 mg/dL = 17.1 µmol/L. |
| Creatinine | mg/dL | µmol/L | mg/dL × 88.4 = µmol/L. Example: 1.0 mg/dL = 88.4 µmol/L. |
| BUN (blood urea nitrogen) | mg/dL | mmol/L (urea) | BUN mg/dL × 0.357 = urea in mmol/L. Example: 14 mg/dL = 5.0 mmol/L. This converts to urea: BUN measures only the nitrogen part of urea, so the two are related but not interchangeable. |
| Uric acid | mg/dL | µmol/L | mg/dL × 59.5 = µmol/L. Example: 6.0 mg/dL = 357 µmol/L. |
| Total protein | g/dL | g/L | g/dL × 10 = g/L. Example: 7.0 g/dL = 70 g/L. |
| Albumin | g/dL | g/L | g/dL × 10 = g/L. Example: 4.0 g/dL = 40 g/L. |
| Calcium | mg/dL | mmol/L | mg/dL × 0.25 = mmol/L. Example: 9.6 mg/dL = 2.40 mmol/L. |
| Potassium | mEq/L | mmol/L | For potassium, 1 mEq/L = 1 mmol/L — the number stays the same, only the unit label changes. |
| Sodium | mEq/L | mmol/L | For sodium, 1 mEq/L = 1 mmol/L — the number stays the same, only the unit label changes. |
| Total cholesterol | mg/dL | mmol/L | mg/dL × 0.0259 = mmol/L. Example: 200 mg/dL = 5.18 mmol/L. |
| LDL cholesterol | mg/dL | mmol/L | mg/dL × 0.0259 = mmol/L. Example: 100 mg/dL = 2.59 mmol/L. |
| HDL cholesterol | mg/dL | mmol/L | mg/dL × 0.0259 = mmol/L. Example: 60 mg/dL = 1.55 mmol/L. |
| Triglycerides | mg/dL | mmol/L | mg/dL × 0.0113 = mmol/L. Example: 150 mg/dL = 1.69 mmol/L. |
| Iron (serum) | mcg/dL | µmol/L | mcg/dL × 0.179 = µmol/L. Example: 100 mcg/dL = 17.9 µmol/L. |
| C-reactive protein (CRP) | mg/dL | mg/L | mg/dL × 10 = mg/L. Example: 0.5 mg/dL = 5 mg/L. |
| Free T4 | ng/dL | pmol/L | ng/dL × 12.87 = pmol/L. Example: 1.0 ng/dL = 12.9 pmol/L. |
| Free T3 | pg/mL | pmol/L | pg/mL × 1.536 = pmol/L. Example: 2.1 pg/mL = 3.2 pmol/L. |
| Vitamin D | ng/mL | nmol/L | ng/mL × 2.496 = nmol/L. Example: 30 ng/mL = 75 nmol/L. |
| Vitamin B12 | pg/mL | pmol/L | pg/mL × 0.738 = pmol/L. Example: 500 pg/mL = 369 pmol/L. |
| Folic acid | ng/mL | nmol/L | ng/mL × 2.266 = nmol/L. Example: 5.0 ng/mL = 11.3 nmol/L. |
| Cortisol | mcg/dL | nmol/L | mcg/dL × 27.59 = nmol/L. Example: 10 mcg/dL = 276 nmol/L. |
| Testosterone | ng/dL | nmol/L | ng/dL × 0.0347 = nmol/L. Example: 500 ng/dL = 17.3 nmol/L. |
| Estradiol | pg/mL | pmol/L | pg/mL × 3.672 = pmol/L. Example: 50 pg/mL = 183.6 pmol/L. |
| Progesterone | ng/mL | nmol/L | ng/mL × 3.18 = nmol/L. Example: 10 ng/mL = 31.8 nmol/L. |
| Prolactin | ng/mL | µg/L | For prolactin the two units are equal: 20 ng/mL = 20 µg/L. |
| Fibrinogen | g/L | mg/dL | mg/dL = g/L × 100. Example: 2.0 g/L = 200 mg/dL. |
| PSA | ng/mL | µg/L | µg/L = ng/mL (numerically identical). |
| AFP | ng/mL | µg/L | µg/L = ng/mL (numerically identical). |
| Magnesium | mmol/L | mg/dL | mg/dL = mmol/L × 2.431. Example: 0.80 mmol/L = 1.9 mg/dL. |
| Carcinoembryonic antigen | ng/mL | µg/L | 1 ng/mL = 1 µg/L — the number stays the same. |
| Anti-thyroglobulin antibodies | IU/mL | kIU/L | 1 IU/mL = 1 kIU/L — the number stays the same. |
| Thyroglobulin | ng/mL | µg/L | 1 ng/mL = 1 µg/L — the number stays the same. |
| Calcitonin | pg/mL | pmol/L | pmol/L = pg/mL × 0.293 |
| ASO (anti-streptolysin O) | IU/mL | kIU/L | 1 IU/mL = 1 kIU/L — the number stays the same. |
| Rheumatoid factor | IU/mL | kIU/L | 1 IU/mL = 1 kIU/L — the number stays the same. |
| 17-OH progesterone | ng/dL | nmol/L | nmol/L = ng/dL × 0.0303 |
| DHEA sulfate (DHEA-S) | µg/dL | µmol/L | µmol/L = µg/dL × 0.0271 |
| Free testosterone | pg/mL | pmol/L | pmol/L = pg/mL × 3.467 |
| Parathyroid hormone (PTH) | pg/mL | pmol/L | pmol/L = pg/mL × 0.106 |
| Apolipoprotein A-I (ApoA1) | mg/dL | g/L | g/L = mg/dL × 0.01 |
| Apolipoprotein B (ApoB) | mg/dL | g/L | g/L = mg/dL × 0.01 |
| Lipoprotein(a) — Lp(a) | mg/dL | mg/L | mg/L = mg/dL × 10 |
| Homocysteine | µmol/L | mg/dL | mg/dL = µmol/L × 0.0135 |
| Glucose tolerance test (OGTT) | mmol/L | mg/dL | mg/dL = mmol/L × 18 |
| Interleukin-6 (IL-6) | ng/L | pg/mL | 1 ng/L = 1 pg/mL — the number stays the same. |
| Procalcitonin (PCT) | ng/mL | µg/L | 1 ng/mL = 1 µg/L — the number stays the same. |
| Transferrin | g/L | mg/dL | mg/dL = g/L × 100 |
| Total iron-binding capacity | µmol/L | µg/dL | µg/dL = µmol/L × 5.585 |
| Hepcidin | ng/mL | µg/L | 1 ng/mL = 1 µg/L — the number stays the same. |
Reference values depend on the measurement method — use the range printed by your laboratory.
Laboratories report in different units and with different reference ranges; the factors above are arithmetic conversions between unit systems, not medical thresholds.
Sources
- How to Understand Your Lab Results: MedlinePlus Medical Test — MedlinePlus, National Library of Medicine. Accessed: August 29, 2026.