Tirzepatide reconstitution calculator
Opens on a 30 mg vial, 3 mL of bacteriostatic water and a 1 mg dose, amounts recorded for Tirzepatide in the compound library. Change any field and the draw updates.
Also known as GIP/GLP-1 dual agonist, Mounjaro, Zepbound.
Original calculator
The classic all-in-one form
Every input on one card, the way the original site worked.
Typical vial strength and dose filled in; recorded examples appear as one-tap presets.
- Draw 10 units for 1 mg doses of Tirzepatide.
- Concentration 10 mg/mL (30 mg in 3 mL). Each vial holds 30 doses of 0.1 mL.
1 mg is below the range recorded for Tirzepatide. Recorded amounts run 2.5 mg to 10 mg per dose. The result is still exact for the number entered.
For research and educational use. This calculator does not provide medical advice.
How the numbers work for Tirzepatide
A 30 mg vial of Tirzepatide with 3 mL of bacteriostatic water is 30 / 3 = 10 mg/mL. A 1 mg dose is 1 / 10 = 0.1 mL, which is 10 units on a U-100 syringe, or the same number of clicks on a pen. With 2 mL of water instead, the concentration is 15 mg/mL and the same dose is 7 units. At that dose the vial holds 30 doses.
The formulas are the same for every compound: concentration is the vial amount divided by the water, the draw is the dose divided by the concentration, and a U-100 unit is 0.01 mL. They are written out on the methodology page.
Tirzepatide units at a glance
Syringe units for the amounts recorded for Tirzepatide, from a 30 mg vial, across the water volumes people most often use. These are recorded examples used for the arithmetic, not recommendations; a draw under 6 units is hard to measure repeatably and more water fixes that.
| Dose | 1 mL water30 mg/mL | 2 mL water15 mg/mL | 3 mL water10 mg/mL |
|---|---|---|---|
| 1 mg | 3 units0.033 mL | 7 units0.067 mL | 10 units0.1 mL |
| 5 mg | 17 units0.17 mL | 33 units0.33 mL | 50 units0.5 mL |
Where the amounts come from
The doses above are recorded amounts from the Tirzepatide entry in the compound library, which lists the sources behind them, labels each as clinical, preclinical or community-reported, and states what the evidence can and cannot support. The vial strength is the one most often listed by suppliers. Nothing on this page is medical advice.
Common questions about Tirzepatide
- Is Tirzepatide an FDA-approved medicine?
- Tirzepatide is the active ingredient of the FDA-approved medicines Mounjaro (2022) and Zepbound (2023). FDA declared the tirzepatide shortage resolved in December 2024, so compounded copies are restricted, and FDA warns that unapproved versions sold for weight loss are not reviewed for safety or quality.
- How much bacteriostatic water do I add to a 30 mg vial of Tirzepatide?
- There is no single right amount: the water sets the concentration and the size of the draw, not the dose. This page opens on 3 mL, which makes 10 mg/mL and puts a 1 mg dose at 10 units on a U-100 syringe. With 1 mL the same dose is 3 units; with 3 mL it is 10 units. More water gives a larger, easier-to-read draw, as long as the vial can hold it.
- How many units is 1 mg of Tirzepatide?
- At 10 mg/mL (30 mg in 3 mL of water), 1 mg is 0.1 mL, which is 10 units on a U-100 insulin syringe or 10 clicks on a peptide pen. At any other concentration the number changes; the units table on this page gives the other common water volumes.
- How many doses are in a 30 mg vial of Tirzepatide?
- At 1 mg per dose, a 30 mg vial holds 30 doses. The water volume changes the size of each draw, not the number of doses in the vial.
- Where do the Tirzepatide amounts on this page come from?
- They are amounts recorded for Tirzepatide in the compound library (https://peptidescalculator.com/compound-library/tirzepatide), which lists the sources behind them and labels each as clinical, preclinical or community-reported. They are shown for the arithmetic, not as recommendations, and the vial strength is the one suppliers list most often. Nothing on this page is medical advice.