Calculate the exact volume to draw from your testosterone vial based on your prescribed dose and vial concentration. Supports every-N-days, weekly, and mL-to-mg modes. Free, instant, no login.
You need three pieces of information from your prescription and vial label: the vial concentration (mg/mL), your prescribed dose (mg), and how often you inject.
Select your mode — Weekly dose if your doctor gave you a weekly amount, Every N days if you inject on a fixed interval, or mL to mg if you want to verify what a drawn volume corresponds to in milligrams.
Enter your values and the result updates immediately. The calculator also shows syringe fill level so you can cross-check what you see in the barrel.
Vial concentration: 200 mg/mL (testosterone cypionate)
Prescribed weekly dose: 100 mg
Injection frequency: once per week
Draw = 100 ÷ 200 = 0.50 mL
Vial concentration: 200 mg/mL
Prescribed weekly dose: 160 mg
Interval: 3.5 days (twice per week)
Per-injection dose = 80 mg → Draw = 80 ÷ 200 = 0.40 mL
The result is the volume in mL to draw from your vial for each injection. On a standard 1mL (U-100) insulin syringe, 0.5mL corresponds to the 50-unit mark. On a 3mL syringe, 0.5mL is at the 0.5 mark on the barrel.
Always verify the drawn volume against the syringe markings before injecting. The calculator is a maths tool — always confirm dosing with your prescribing doctor or pharmacist.
| Concentration | 100 mg dose | 150 mg dose | 200 mg dose |
|---|---|---|---|
| 100 mg/mL | 1.00 mL | 1.50 mL | 2.00 mL |
| 200 mg/mL | 0.50 mL | 0.75 mL | 1.00 mL |
| 250 mg/mL | 0.40 mL | 0.60 mL | 0.80 mL |