TRT calculator

Estimate free testosterone or convert a prescribed dose to volume. Keep your inputs with a free account.

Values from your blood report

Total testosteroneTestosterone unitSHBG (nmol/L)Albumin (optional)Blank uses 43 g/L. An assumed albumin can make the estimate less representative of your result.Albumin unit

Calculated estimate

Free testosterone

Enter total testosterone and SHBG to see the estimate.

Calculated using the Vermeulen binding model. This is not a measured free testosterone result or a treatment target. Interpretation depends on the laboratory method and your clinical context.

Method and limitations

Educational calculations only. Your clinician should interpret blood results and decide treatment. This calculator does not recommend dose changes, blood donation or additional medication.