Cortisol conversion: µg/dL to nmol/L
For cortisol, 1 µg/dL = 27.5888 nmol/L, and 1 nmol/L = 0.0362466 µg/dL.
Common values
µg/dL to nmol/L
| µg/dL | nmol/L |
|---|---|
| 1 | 28 |
| 2 | 55 |
| 3 | 83 |
| 5 | 138 |
| 7 | 193 |
| 10 | 276 |
| 15 | 414 |
| 18 | 497 |
| 20 | 552 |
| 25 | 690 |
| 30 | 828 |
| 40 | 1104 |
nmol/L to µg/dL
| nmol/L | µg/dL |
|---|---|
| 25 | 0.9 |
| 50 | 1.8 |
| 100 | 3.6 |
| 150 | 5.4 |
| 200 | 7.2 |
| 250 | 9.1 |
| 300 | 10.9 |
| 400 | 14.5 |
| 500 | 18.1 |
| 600 | 21.7 |
| 800 | 29.0 |
| 1000 | 36.2 |
Each converted value is worked out in full and then rounded: nmol/L to whole numbers and µg/dL to one decimal place.
Source: molar masses summed from the IUPAC CIAAW abridged standard atomic weights, 2024.
The values are facts and free to use; this table’s selection and presentation are © 2026 ScienceQuest.
Why the factor is specific to cortisol
Cortisol, C₂₁H₃₀O₅, has a molar mass of 362.466 g/mol, summed from the standard atomic weights of its atoms. A result in µg/dL is a mass and one in nmol/L an amount of substance, so converting divides by the molar mass and multiplies by 10,000: 10 for the decilitres in a litre, times 1000 for the nanomoles in a micromole: 1 µg/dL = 10,000 ÷ 362.466 = 27.5888 nmol/L.
- nmol/L = µg/dL × 10,000 ÷ 362.466
- µg/dL = nmol/L × 362.466 ÷ 10,000
Which countries report which unit
American laboratories usually report cortisol in µg/dL, also written mcg/dL; British, Canadian and Australian ones report nmol/L.
Worked example
- 10 µg/dL in nmol/L
- = 10 × 10,000 ÷ 362.466
- = 275.888 nmol/L