Testosterone injection volume calculator

How it works

Testosterone for injection is an oil with a fixed amount of hormone in every millilitre. The strength is printed on the vial: 200 mg/mL is the most common in the US for cypionate and enanthate, and 100 mg/mL and 250 mg/mL also exist. To find the volume of a dose:

mL = dose in mg ÷ vial strength in mg/mL

Insulin syringes are scaled for U-100 insulin, where 100 units fill exactly 1 mL. So the unit marking is just volume × 100. A 0.3 mL syringe ends at 30 units, a 0.5 mL syringe at 50 and a 1 mL syringe at 100.

With a Luer-Lock syringe, many people draw the oil with a thicker needle and then twist on a thinner one to inject; your pharmacy or prescriber will tell you which needles to use. Insulin syringes have a fixed needle, so the same needle draws and injects.

We round the volume to 0.001 mL and the units to the nearest half unit, the finest line anyone can read on these barrels. The per-week figure multiplies one injection by how many you take in a week; for every-3-days and every-other-day schedules that is an average week.

Subcutaneous injections are usually small volumes, often under 0.5 mL. If your volume is over 1 mL, check with your prescriber how they want it given.