Lab-based
Free Testosterone Calculator
Enter your lab values to estimate free testosterone. This is a reference calculation, not a clinical diagnosis.
Estimated free testosterone
99.5
pg/mL
Reference categoryNormal
Age-band reference7.5–26.0 ng/dL
Illustrative result based on the values shown.
How this is calculated.
The Vermeulen equation estimates binding among total testosterone, SHBG, and albumin by solving a quadratic equilibrium equation. Laboratory methods and reference intervals vary.
Results are estimates and may not reflect individual health needs.