Tirzepatide 30 mg reconstituted with 0.5 mL
Concentration
60mg/mL
- Per insulin unit
- 600 mcg
- Solution in vial
- 50 u
- 15 mg draw
- 25 u
Math utility only — not medical advice. Not a recommended dose.
Units per dose at 60 mg/mL
Insulin syringes are graduated in hundredths of a millilitre, so units = mL × 100 on a U-100, U-50 or U-30 barrel alike.
| Dose | Volume | U-100 units | Fits | Doses per vial |
|---|---|---|---|---|
| 2.5 mg | 0.042 mL | 4.2 u | U-30 | 12 |
| 5 mg | 0.083 mL | 8.3 u | U-30 | 6 |
| 7.5 mg | 0.125 mL | 12.5 u | U-30 | 4 |
| 10 mg | 0.167 mL | 16.7 u | U-30 | 3 |
| 12.5 mg | 0.208 mL | 20.8 u | U-30 | 2 |
| 15 mg | 0.25 mL | 25 u | U-30 | 2 |
How this is calculated
1 · Concentration
30 mg ÷ 0.5 mL = 60 mg/mL
The peptide mass never changes — bacteriostatic water only sets how concentrated the solution is, and therefore how far the plunger travels.
2 · Volume for a 15 mg dose
15 mg ÷ 60 mg/mL = 0.25 mL
3 · Insulin units
0.25 mL × 100 = 25 units
Every unit on the barrel carries 600 mcg at this concentration, so misreading by one unit is a 600 mcg error.
See it on a real syringe
The interactive calculator draws this 60 mg/mL mix on a scaled U-100 barrel, shows when a draw lands exactly on a printed tick, and works backwards from a target dose to the water volume that makes it land cleanly.
Open the interactive calculator →Common questions
- How much bacteriostatic water for a 30 mg Tirzepatide vial?
- Adding 0.5 mL of bacteriostatic water to a 30 mg Tirzepatide vial yields 60 mg/mL — 600 mcg in every insulin unit. The reconstituted vial holds 50 units of solution in total.
- How many units is a 15 mg dose of Tirzepatide at 30 mg in 0.5 mL?
- 15 mg is 0.25 mL of this mix, which is 25 units on a U-100 insulin syringe (a U-30 barrel is enough).
- How many 15 mg doses does a 30 mg vial give?
- A 30 mg vial contains 2 full 15 mg doses. Using more or less bacteriostatic water changes the units you draw, never the number of doses in the vial.