How to use the TRT dosage calculator

What this calculator does (and does not do)

• Does: converts weekly dose + concentration + frequency into per-injection mg and mL (plus schedule logic and syringe visuals).
• Does not: decide your protocol, interpret labs, or tell you what dose you “should” use.

Before you calculate (pre-flight checklist)

• Concentration (mg/mL) from the vial label (e.g. 200, 250, 300 mg/mL).
• Weekly total (mg/week) you intend to run.
• Frequency you can execute consistently (weekly, every 3–4 days, every 2 days, daily).
• Lab timing if you’re using bloodwork to guide changes (keep it consistent; trough/pre-injection is the default).

Lab timing references: Pre-injection bloodwork checklist and Ongoing monitoring & follow-up labs.

Step-by-step: inputs that matter

1) Weekly dose (mg/week)

• Enter your total weekly amount.
• Do not enter “per-shot” dose here—frequency handles the split.

2) Concentration (mg/mL)

• Enter the label concentration (example: 250 mg/mL).
• This is not “how many mL you inject.” It’s strength per mL.

3) Frequency (weekly vs every N days)

• Weekly = every 7 days.
• Every N days = you select the interval (2, 3, 4, etc.).

Choosing frequency for 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 correct if the syringe type matches reality.

How to read the results

• mg per injection = weekly mg divided by injections per week (based on frequency).
• mL per injection = mg per injection ÷ concentration.
• Schedule = the repeatable pattern the 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)
• Changing dose and frequency at the same time (you won’t know what did what)
• Inconsistent injection timing (creates symptom noise + lab noise)

Using bloodwork with the calculator (clean workflow)

1. Hold protocol stable for 6–8 weeks.
2. Test consistently (same timing; trough/pre-injection is standard).
3. Decide one change (dose or frequency).
4. Use the calculator to turn that decision into an executable schedule.
5. Re-test 6–8 weeks later to confirm trend.

Start here: Bloodwork overview

Where to go next

• Testosterone guides
• Weekly vs every N days
• Bloodwork overview

Common questions

Should I change dose or frequency first?

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

When should I re-test after a change?

Typically 6–8 weeks. Testing early creates noise. 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 after 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.
• Keep bloodwork timing consistent so comparisons are real.