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Hormones

Free Testosterone Calculator

Calculate free and bioavailable testosterone using the Vermeulen method. Enter total testosterone, SHBG, and albumin for instant results.

nmol/L
nmol/L
g/L

Get Your Free Testosterone Tested

Order a blood test that includes Free Testosterone, with AI-powered analysis and recommendations built around your results.

Key Points

  • Calculates free and bioavailable testosterone from Total T, SHBG, and Albumin
  • Based on the validated Vermeulen equation (1999)
  • Free testosterone is the biologically active fraction (~1.5-3.5% of total)
  • Useful when total testosterone is borderline but symptoms are present
  • Results should be interpreted by a healthcare professional

Check Your Free Testosterone

A blood test that includes Free Testosterone, with AI-powered analysis and recommendations built around your results.