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Free & Bioavailable Testosterone Calculator
Calculate free and bioavailable testosterone using the Vermeulen formula.
Your stats
Default is usually 4.3 g/dL
Results
Enter your values to see the calculation results.
Calculations based on the Vermeulen et al. (1999) formula.
📝 Detailed guide for this tool is coming soon. In the meantime, try the tool above — every
input has a label and the results update live.
Educational use only — not medical advice. Results are estimates based on published formulas and models.