Hormones

Cortisol unit converter

Stress hormone (morning level)

Also known as: Serum cortisol, Hydrocortisone, Compound F, Kortisol, Cortisolo

Converter

Enter a value in any unit and all other units fill in.

µg/dL nmol/L mg/L µmol/L µg/L

Worked example

414 nmol/L (middle of the reference range) = 15 µg/dL

Conversion formulas

µg/dL	µg/dL = nmol/L × 0.03625	nmol/L = µg/dL × 27.59
mg/L	mg/L = nmol/L × 0.0003625	nmol/L = mg/L × 2759
µmol/L	µmol/L = nmol/L × 0.001	nmol/L = µmol/L × 1000
µg/L	µg/L = nmol/L × 0.3625	nmol/L = µg/L × 2.759

Reference range

Unit	Adults
µg/dL	5.002 – 25.01
nmol/L	138 – 690
mg/L	0.05 – 0.2501
µmol/L	0.138 – 0.69
µg/L	50.02 – 250.1

Source: MedlinePlus (NLM): Cortisol blood test · Last reviewed: 2026-10-14

Note from the source: 8 a.m. sample: 5-25 µg/dL (138-690 nmol/L); depends on time of day (MedlinePlus)

Frequently asked questions

How do I convert Cortisol from nmol/L to µg/dL?

µg/dL = nmol/L × 0.03625. In the other direction: nmol/L = µg/dL × 27.59.

What is the reference range of Cortisol?

For adults the range is 138 – 690 nmol/L (MedlinePlus (NLM): Cortisol blood test). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Cortisol?

Common units are µg/dL, nmol/L, mg/L, µmol/L, µg/L.