Free Testosterone Calculator
Vermeulen formula for free and bioavailable testosterone. The clinical gold standard when LC-MS direct measurement isn't available.
For informational and harm-reduction purposes only. This is not medical advice. Always consult a qualified healthcare provider.
Dosing
Bloodwork
nmol/L
Within reference range
Free T in the typical adult male range (0.225-0.66 nmol/L).
Results
Free testosterone0.397 nmol/L
Free T (pg/mL)114.4 pg/mL
Free %1.98%
Bioavailable T10.06 nmol/L (50.3%)
Vermeulen formula (Vermeulen et al, 1999, JCEM). Mass-action equilibrium model using testosterone-SHBG and testosterone-albumin association constants. The clinical gold standard when LC-MS direct free T measurement is unavailable.
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