Calculators / Tirzepatide
Tirzepatide reconstitution calculator
Enter your vial size, bacteriostatic water, and target dose — get the concentration, the exact U-100 syringe draw, and how many doses the vial holds. No account, no vendor ties, numbers never leave your browser.
Watch: How long does tirzepatide (Mounjaro) stay in your system? Half-life math
Tirzepatide — the active ingredient in Mounjaro and Zepbound — has a half-life of about 5 days: five days after a dose, half is still in your system. From our official channel — education only, never a dosing recommendation. Watch on YouTube ↗
Discussions
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Community posts are personal reports, not advice. Read the rules before posting.
How the math works
Three formulas, checked twice — the same engine that powers the Zyra Track app:
- concentration (mg/mL) = peptide in vial (mg) ÷ BAC water (mL)
- draw volume (mL) = dose ÷ concentration
- U-100 units = draw volume (mL) × 100
Worked example: 15 mg Tirzepatide + 2 mL water = 7.5 mg/mL. A 7.5 mg dose is then 7.5 mg ÷ 7.5 mg/mL = 1 mL = 100 units on a U-100 insulin syringe.
Tirzepatide quick facts
| Half-life | ≈ 5 days |
|---|---|
| Typical route (published research) | SubQ · weekly |
| Common vial sizes | 5 mg · 10 mg · 15 mg · 30 mg |
Source: FDA label: Mounjaro (tirzepatide) prescribing information
See also: Tirzepatide half-life & clearance curve · Tirzepatide dose charts (mg → units)
Frequently asked
How much BAC water should I add to a 15 mg Tirzepatide vial?
There is no single correct amount — the water volume sets the concentration, not the dose. Adding 2 mL to 15 mg gives 7.5 mg/mL, which puts a 7.5 mg draw at 100 units on a U-100 insulin syringe. More water = larger, easier-to-measure draws; less water = smaller draws.
How many units is 7.5 mg of Tirzepatide?
It depends entirely on your concentration. At 7.5 mg/mL (15 mg + 2 mL), 7.5 mg is 100 units on a U-100 syringe. Use the calculator above with your own vial and water volumes.
What is the half-life of Tirzepatide?
Tirzepatide's reported half-life is ≈ 5 days. See our cited half-life reference for the decay curve and clearance math.
Is this medical advice?
No. This calculator performs general arithmetic on values you enter, for research and educational purposes. It never recommends doses and we never answer sourcing questions.
Guides for Tirzepatide
Track the whole protocol, not just one draw
The Zyra Track app logs doses, schedules reminders, estimates medication levels from published half-lives, and keeps your whole protocol in one place. Free during the founding period.
Zyra Track is a research and educational utility. Nothing on this page is medical advice, a dosing recommendation, or an endorsement of any compound. We never sell or source compounds and refuse sourcing questions. Consult a qualified clinician for decisions about your health.