The FAI index calculator was developed to calculate the free androgen index (FAI).

Testosterone and sex hormone binding globulin (SHBG) concentrations should be measured to calculate the FAI. The tests should be performed on the same blood sample taken at the same time. Ideally, both tests should be performed in one laboratory.

The calculator enables the calculation of the FAI from the parameters determined at different concentrations. You can choose from:

testosterone concentration in concentration units:

- nmol/L
- ng/mL
- ng/dL

SHBG concentration in concentration units:

- nmol/L
- μg/mL (mg/L)

The calculator will calculate the FAI in units for each configuration.

The calculation of the FAI index shows the concentration of testosterone not bound to albumin.

## FAI index calculator converter – calculate it

To calculate the free androgen index, enter the testosterone and SHBG values, and then select the concentration units. The calculator will automatically calculate the FAI.

## FAI index converter calculator. How to calculate?

To calculate the FAI, use the following formula:

FAI [%]= ([testosterone concentration in nmol/L] / [SHBG concentration in nmol/L]) *100

For test results in other units – please use the appropriate conversion factors that you will find in the related calculators.

## Other calculators

In the category you will find at the top of the page – CALCULATORS you will find other medical calculators and concentration converters. Is any one missing? Write to me! Leave a comment under the post!

A-Z list of medical calculators

**Disclaimer**: This page is for informational purposes only. Conversion rates have been compiled based on publicly available information. All information should be confirmed and verified. The data on the site is not a substitute for professional medical advice. Any information, result, conversion should be consulted with a doctor.