Free tool
Free testosterone calculator
Total testosterone alone can mislead. Add your SHBG and albumin to see how much is actually free and usable.
Sex hormone-binding globulin, from the same blood draw.
Leave at 4.3 if it wasn't measured.
Used only for the percentile estimate.
Calculated free testosterone
90.0
pg/mL
= 9.00 ng/dL, or 2.00% of your total.
Bioavailable T
210ng/dL
Total T
450ng/dL
Total T
15.6nmol/L
Total T vs. men aged 30–39 (approximate)
Your total sits about the 38th percentile.
Rough population bands, not a lab's reference range. Your lab report's range and your symptoms matter more than a percentile.
Low numbers and low energy? Talk to a provider.
Book a TRT consult at Englewood or Lakewood. We'll review your labs, symptoms and goals and lay out options, which may or may not include testosterone.
How it works
Free T is solved with the Vermeulen equation using binding constants of 3.6×10⁴ L/mol for albumin and 1×10⁹ L/mol for SHBG. Bioavailable T is free plus albumin-bound testosterone. Results track equilibrium-dialysis measurements closely for most men but can differ at very high or low SHBG.
Educational only, not a diagnosis. Testosterone varies by time of day and between draws; a morning fasting sample, repeated once, is the standard before any treatment decision.