Free TRT tools
Simple calculators for men on testosterone therapy. Put in your current prescription and see what it means: in mL and syringe units, or as a curve over the weeks. They run in your browser and never store what you type. Planners can go straight into your calendar, as a PDF or to your inbox.
- Low-T symptom self-checkEleven quick questions about symptoms that can go with low testosterone, and what to ask your clinician.Open tool →
- Testosterone level calculatorSee the shape of your levels between injections: peak, trough and how long until they settle.Open tool →
- Injection volume calculatorTurn your prescribed mg dose into mL and insulin-syringe units, with the syringe drawn to the line.Open tool →
- Injection site rotation plannerPick your approved sites and schedule, and see where your next 8 injections go on a body map.Open tool →
- Blood-test timing plannerWork out when to book a trough or midpoint draw from your last injection.Open tool →
- Injection schedule plannerLay out 12 weeks of injection dates, with the trough blood-test window before each one.Open tool →
- Free testosterone calculatorEstimate free and bioavailable testosterone from total T, SHBG and albumin (Vermeulen).Open tool →
- Vial supply calculatorSee how many injections a vial holds and when you will need a refill.Open tool →
These tools are for education. None of them suggests a dose. Talk to your prescriber before changing anything.
Track it every week, automatically
TRTracker logs each injection and redraws your curve for you, with the uncertainty range.
Scan with your iPhone