Testosterone Sex Hormone Binding Globulin Ratio Calculator

This calculator helps determine the ratio of free testosterone to Sex Hormone Binding Globulin (SHBG) to assess testosterone bioavailability and hormonal balance in the body.

Input Parameters

Calculation Results

Calculation Formula

Free Testosterone Index = Testosterone × 100 / SHBG

Where:
Testosterone: Blood level of testosterone hormone
SHBG: Sex Hormone Binding Globulin level

Results

Free Testosterone Index (FI):

Interpretation:

Testosterone Sex Hormone Binding Globulin Ratio Calculator Calculator Usage Guide

Learn how to use the Testosterone Sex Hormone Binding Globulin Ratio Calculator and its working principles

How to Use This Calculator

  1. Enter your Testosterone Level in ng/dL (nanograms per deciliter).
  2. Enter your Sex Hormone Binding Globulin (SHBG) Level in mg/dL (milligrams per deciliter).
  3. Click the "Calculate" button to compute the Free Testosterone Index (FI).
  4. Review the calculated FI and interpretation provided.

Understanding the Results

The Free Testosterone Index (FI) is calculated as:

FI = Testosterone Level (ng/dL) × 100 / SHBG Level (mg/dL)

This index helps estimate the amount of free testosterone in your body, which is biologically active and available to interact with receptors.

Interpretation Guidelines

  • FI < 20: Low Free Testosterone Index - May indicate hypogonadism or other hormonal imbalances.
  • 20 ≤ FI ≤ 30: Normal Free Testosterone Index - Within typical physiological range.
  • FI > 30: High Free Testosterone Index - May indicate hyperandrogenism or other conditions.

Important Note: This calculator provides a general estimation and should not replace professional medical advice. Always consult with a healthcare provider for accurate diagnosis and treatment recommendations.