TRT Dosage Calculator
Convert a weekly testosterone amount you already have into exact mL and syringe units per shot. Works with cypionate, enanthate, propionate, Sustanon and any ester at any concentration.
This is a unit converter. It converts an amount you already have into volume and syringe units. It does not tell you what to take, and it is educational only — not medical advice. Confirm every amount with your clinician and your product label.
Convert your amount
The concentration is prefilled with a common vial strength you can change — it is a product fact, not a recommendation. Enter the weekly amount your clinician prescribed and how many injections you split it into. Nothing is suggested for you.
Enter weekly amount as a number.
Enter injections per week as a number.
Enter your weekly amount, the vial concentration and how many injections you split it into to see the volume.
Save this protocol
Keep your weekly amount, ester concentration and injection days in DoseRoutine — with site rotation, reminders and bloodwork tracking around them.
Save this protocolFree — the tool above stays free with or without an account.
How we handle safety and your data
- DoseRoutine is a tracking and reference tool. It does not diagnose, prescribe, or replace your doctor or pharmacist.
- Interaction results are informational flags to discuss with a clinician — not clearances to combine anything.
- Dose calculators do the arithmetic you enter. They don't decide what you should take, or how much.
Read the medical disclaimer, editorial policy and how we source content.
Cypionate 200 mg/mL
Most common ester in the US. 140 mg/week ÷ 2 shots = 0.35 mL = 35 units U-100.
Enanthate 250 mg/mL
Common outside US. 150 mg/week ÷ 2 shots = 0.30 mL = 30 units U-100.
Propionate 100 mg/mL
Short ester. 100 mg/week ÷ 4 shots (EOD) = 0.25 mL = 25 units U-100.
Track your TRT protocol in DoseRoutine
This calculator gives you the number. DoseRoutine turns it into a full protocol: injection schedule, site rotation, vial inventory, blood work tracker, and shareable PDF summarys.
- Automatic SubQ / IM injection site rotation
- Vial inventory + refill prediction based on your weekly volume
- Total-T, free-T, E2, hematocrit trend charts
- Interaction checks with AI, anastrozole, HCG, peptides
- One-tap shareable PDF summary for lab review appointments
Frequently asked questions
How do I calculate my TRT dose in syringe units?
Testosterone cypionate and enanthate are typically 200 mg/mL. Divide weekly mg by 200 to get mL per week, then divide by injections per week for mL per shot. Multiply mL × 100 for U-100 insulin syringe units. Example: 140 mg/week ÷ 200 = 0.7 mL/week. Split twice weekly = 0.35 mL = 35 units per shot.
What is a typical TRT dosage?
General reference range, not a recommendation: clinically supervised TRT is commonly 100–200 mg/week of testosterone cypionate or enanthate, adjusted based on total and free testosterone, hematocrit, and estradiol labs. Never adjust dose without bloodwork and clinician guidance.
How often should I inject testosterone?
Half-life drives frequency. Cypionate (~8 days) and enanthate (~7 days) can be dosed once, twice, or three times weekly. More frequent smaller doses smooth blood levels and often reduce estradiol conversion. Propionate (~2 days) requires EOD or daily. Enter injections per week in the calculator to get per-shot volume.
Can this calculator handle testosterone propionate or Sustanon?
Yes. Enter your ester's concentration (mg/mL) — propionate is typically 100 mg/mL; Sustanon 250 is 250 mg/mL. The calculator returns exact mL and syringe units per shot.
What syringe do most TRT users use?
Subcutaneous TRT commonly uses a U-100 insulin syringe with 29–31 gauge, 8 mm needle. Intramuscular TRT typically uses a 23–25 gauge, 1 inch needle with a 1 or 3 mL syringe. The calculator shows units for both U-100 and U-40 syringes.
Peptide dosage glossary
Quick definitions for the terms used across peptide reconstitution, syringe unit conversion, and TRT dosing.
- Reconstitution
- Dissolving a lyophilized (freeze-dried) peptide with bacteriostatic water to make an injectable solution.
- Bacteriostatic water (BAC water)
- Sterile water with 0.9% benzyl alcohol that inhibits bacterial growth, extending a mixed vial's usable life to ~28 days refrigerated.
- Concentration (mg/mL)
- Peptide milligrams divided by BAC water milliliters. Drives how many syringe units equal your target dose.
- U-100 insulin syringe
- Holds 100 units per 1 mL. 1 unit = 0.01 mL. The standard syringe for peptide and TRT subcutaneous dosing.
- U-40 insulin syringe
- Holds 40 units per 1 mL. 1 unit = 0.025 mL. Less common; using it in place of U-100 changes dose by ~60%.
- Subcutaneous (SC)
- Injection into the fatty layer under the skin (abdomen, flank, thigh) using a 29–31 gauge, 8 mm insulin needle.
- Intramuscular (IM)
- Injection into muscle tissue (glute, delt, quad) with a 23–25 gauge, 1 inch needle. Common for TRT esters.
- Half-life
- Time for blood levels to fall by half. Drives injection frequency — short half-life = more frequent shots.
- Ester
- Chemical tail attached to testosterone (cypionate, enanthate, propionate) that controls release speed and half-life.
- mcg vs mg
- 1 mg = 1,000 mcg. Peptide doses are often written in mcg; always confirm units before drawing.
Related calculators
More free DoseRoutine calculators and dosing references.
- All calculators
Index of every DoseRoutine calculator and dosing tool.
- Peptide dosage calculator
Convert peptide doses into exact insulin-syringe units.
- Peptide reconstitution
Plan BAC water, concentration and doses per vial.
- Reconstitution calculator
Lightweight standalone reconstitution tool.
- Dosage units guide
Reference for mg, mcg, IU, U-100 units and mL conversions.
Reviewed by the DoseRoutine editorial team. Last reviewed .