Trt Dosage Calculator

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✓ Reviewed by Dr. David Chen, MD | Specialist in Endocrinology | Updated October 2023

Optimizing your Testosterone Replacement Therapy (TRT) requires precision. This trt dosage calculator helps you accurately determine your weekly dose, injection volume, or frequency to ensure your protocol stays within therapeutic ranges.

TRT Dosage Calculator

Enter at least 3 values to calculate the missing variable.

TRT Dosage Calculator Formula:

Weekly Dose (mg) = Concentration (mg/mL) × Volume (mL) × Frequency (per week)

Source: Mayo Clinic – Testosterone Guidelines

Variables:

  • Weekly Dose (mg): The total amount of testosterone prescribed per week.
  • Concentration (mg/mL): The potency of the oil (commonly 200mg/mL or 250mg/mL).
  • Frequency: How many times you inject per week (e.g., 1 for weekly, 7 for daily).
  • Volume per Injection (mL): The actual amount drawn into the syringe for a single shot.

Related Calculators:

What is a TRT Dosage Calculator?

A trt dosage calculator is a specialized tool used by patients and healthcare providers to translate a medical prescription into actionable injection volumes. Because testosterone comes in various concentrations, it is easy to miscalculate the amount of oil needed for a specific milligram dose.

Using this calculator ensures that you are neither under-dosing, which leads to suboptimal symptom relief, nor over-dosing, which increases the risk of side effects like elevated hematocrit or high estrogen.

How to Calculate TRT Dosage (Example):

  1. Identify your prescribed weekly dose (e.g., 100mg).
  2. Check your vial concentration (e.g., 200mg/mL).
  3. Decide on frequency (e.g., 2 injections per week).
  4. Divide Weekly Dose by Concentration: 100 / 200 = 0.5 mL total per week.
  5. Divide Total Volume by Frequency: 0.5 / 2 = 0.25 mL per injection.

Frequently Asked Questions (FAQ):

Is 200mg/mL the standard concentration? Yes, in the US, Cypionate is typically 200mg/mL, but 250mg/mL is common in Europe and with Enanthate.

Why inject more than once a week? Splitting doses helps maintain more stable blood levels and minimizes “peaks and troughs.”

What is the most common TRT dose? Most protocols fall between 100mg and 200mg per week, though individual needs vary.

Can I use this for subcutaneous injections? Yes, the math remains the same whether the injection is intramuscular or subcutaneous.

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