How to use the TRT dosage calculator

What this calculator does (and does not do)

• It does: convert weekly dose + concentration + frequency into per-injection mg and mL, with schedule logic and syringe visuals.
• It does not: decide your protocol, interpret your labs, or tell you what dose you “should” be on.

Before you calculate (pre-flight checklist)

• Confirm your vial concentration (e.g. 250 mg/mL, 200 mg/mL).
• Confirm your intended weekly total (mg/week).
• Choose a frequency you can follow consistently (weekly, every 3–4 days, every 2 days, daily).
• If you’re using labs to guide changes, standardise timing (trough/pre-injection).

For lab timing rules: Pre-injection bloodwork checklist and Ongoing monitoring & follow-up labs.

Step-by-step: how to enter the inputs

1) Weekly dose (mg/week)

• Enter your total weekly dose, not per-injection dose.
• If your plan is “split dose”, you still enter the weekly total—frequency handles the split.

2) Concentration (mg/mL)

• Use the number on the vial label (common: 200, 250, 300 mg/mL).
• Do not enter “mL” here—this is concentration only.

3) Frequency (weekly vs every N days)

• Weekly = one injection every 7 days.
• Every N days = you pick a repeatable interval (2, 3, 4, etc.).

If you’re choosing frequency based on stability: Weekly vs every N days.

4) Syringe type (visual accuracy)

• Select the syringe scale you’re actually using (1 mL insulin, 0.5 mL, etc.).
• The visuals are only reliable if the syringe type matches reality.

How to read the results

• mg per injection = weekly mg divided by number of injections in your schedule.
• mL per injection = mg per injection ÷ concentration (mg/mL).
• Schedule = the repeatable pattern your frequency creates.

Common mistakes that create “bad outputs”

• Mixing mg and mL (entering volume where concentration is required)
• Entering per-shot dose as weekly dose (double-splitting the dose)
• Changing dose and frequency at the same time (you won’t know what caused what)
• Inconsistent injection timing (creates symptoms + lab noise)

Using bloodwork with the calculator (the clean pathway)

1. Hold protocol stable for 6–8 weeks.
2. Test consistently (prefer trough/pre-injection).
3. Use labs + symptoms to decide one change (dose or frequency).
4. Use the calculator to convert that change into an executable schedule.
5. Re-test 6–8 weeks later to confirm trend.

Start at: Bloodwork overview

Where to go next

• Testosterone guides – dose planning and frequency fundamentals.
• Weekly vs every N days – stability and symptom smoothing.
• Bloodwork overview – labs-to-dose decision pathway.

Common questions

Should I change dose or frequency first?

If your issue looks like peaks/troughs (great then crash), change frequency first while keeping weekly mg the same. If you’re stable but underpowered, dose may be the lever. One change at a time.

When should I re-test after a change?

Typically 6–8 weeks. Testing early creates noise and overreactions. See: Ongoing monitoring & follow-up labs.

Why doesn’t the calculator tell me the “best dose”?

Because it can’t. Dose decisions require symptoms, safety markers, and consistent bloodwork timing. The calculator makes execution accurate once the decision is made.

Key takeaways

• Enter weekly mg, not per-shot mg.
• Confirm concentration (mg/mL) from the vial label.
• Choose the simplest frequency you can execute perfectly.
• Use consistent bloodwork timing so comparisons are real.