DoseRoutine

TRT dosage calculator

TRT Dosage Calculator

Convert your weekly testosterone dose into exact mL and syringe units per shot. Works with cypionate, enanthate, propionate, Sustanon and any ester at any concentration.

Calculate your dose

Weekly dose (mg)

Concentration (mg/mL)

Injections per week

Per shot

70.0 mg · 0.350 mL

Syringe units

35.0 U-100 · 14.0 U-40

Weekly volume: 0.700 mL. Educational tool — always confirm dose with your prescribing clinician and current bloodwork.

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 doctor-ready PDF exports.

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 doctor-ready PDF for lab review appointments

Try free for 7 days Peptide calculator

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?

Clinical TRT is usually 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.