Testosterone Vial Calculator
How long will your vial last? Calculate injections, dead space waste, and cost per week.
~0.04 mL for standard needles, ~0.00 mL for low dead space
Your vial will last approximately:
12 weeks
(24 injections from a 10 mL vial)
0.375 mL
Per Injection
24
Total Injections
192 mg
Lost to Dead Space
(9.6%)
For educational and research purposes only. This calculator provides estimates based on standard formulas.
Always verify calculations with your healthcare provider before use. We assume no liability for dosing errors, adverse events, or outcomes resulting from use of this tool.
How to Use This Calculator
Enter your vial size
The total mL volume of your testosterone vial (1 mL or 10 mL)
Enter concentration
The mg/mL printed on your vial label (usually 200 mg/mL)
Enter your weekly dose
Your total prescribed dose per week in mg
Set injection frequency
How many times per week you inject (1x, 2x, 3x, or daily)
Vial Longevity Q&A
Related Tools
Data Sources
This tool uses dosing information from official prescribing information:
- •USP Multi-Dose Vial Guidelines — 28-day beyond-use date for multi-dose vials per USP <797>
- •Dead Space Research — Standard needle dead space ~0.04 mL; LDS needles ~0.003 mL
Track your TRT protocol, not just the math
Regimen has a built-in dose calculator plus reminders, logging, and progress tracking.
- Built-in dose calculators
- Smart injection reminders
- Log levels, symptoms, and progress
- Private, secure health data
