Common vial sizes and water amounts
| Vial | Water | What that gives you |
|---|---|---|
| 10 mg | 1 mL | 10 mg/mL; 2.5 mg = 25U |
| 15 mg | 1.5 mL | 10 mg/mL; 2.5 mg = 25U |
| 30 mg | 2 mL | 15 mg/mL; 2.5 mg = 16.7U |
| 30 mg | 3 mL | 10 mg/mL; 2.5 mg = 25U |
| 60 mg | 4 mL | 15 mg/mL; 5 mg = 33.3U |
Worked examples
Concentration 15 mg/mL → 150 mcg per unit → draw 16.7 units (0.167 mL) on a 30U syringe. That vial holds about 12 such draws.
Concentration 10 mg/mL → 100 mcg per unit → draw 25 units (0.25 mL) on a 30U syringe. That vial holds about 12 such draws.
Concentration 10 mg/mL → 100 mcg per unit → draw 25 units (0.25 mL) on a 30U syringe. That vial holds about 4 such draws.
Notes for this calculator
A useful habit with tirzepatide is mixing to a round concentration. 10 mg/mL makes every unit 0.1 mg, so a 2.5 mg entry is 25 units, 5 mg is 50 units, and you can read the syringe without a calculator. The preset table shows which water amounts produce 10 mg/mL for each vial.
Milligram entries on a 30U syringe run out of room fast. If your draw is over 30 units the calculator will suggest a 50U or 100U syringe, or less water.
Vials for this calculator: see what ThePeptideStore carries. Supplies around the vial are in the kit above.
Common questions
How much bacteriostatic water for a 30 mg tirzepatide vial?
3 mL gives 10 mg/mL, so 2.5 mg is 25 units and 5 mg is 50 units. 2 mL gives 15 mg/mL, so 2.5 mg is about 17 units. Enter your own numbers above to see the exact draw.
How many units is 2.5 mg of tirzepatide?
At 10 mg/mL it is 25 units. At 15 mg/mL it is about 17 units. At 5 mg/mL it is 50 units. The concentration comes from your vial size and water.
How many doses are in a 30 mg vial?
Divide 30 mg by your entry: 2.5 mg gives 12 draws, 5 mg gives 6. The calculator shows this as doses per vial and, if you add the vial price, the cost per draw.
Does the calculator recommend a dose?
No. You enter the dose your protocol calls for and it converts that into syringe units, mL, and doses per vial. It never suggests what to take.
Why is my draw too big for the syringe?
The concentration is low for that dose. Either use a larger U-100 syringe or mix the next vial with less water. The calculator shows the exact water amount that would fit your syringe.