Tirzepatide Dosage Calculator
Enter the amount in your Tirzepatide vial, the volume it is in, and the dose you want expressed in syringe units. This page computes the arithmetic of those values — concentration, the volume to draw, insulin-syringe units, and doses per vial. It is not a dosing recommendation.
- Concentration
- 10 mg/mL
- Draw volume
- 0.5 mL
- Doses per vial
- 6
Save to the DoseWise app
Get the app — coming soon.
The values above are pre-filled as a worked example so the page loads with numbers to read. They are not a recommended vial size, diluent volume, or dose. Change any field to compute your own.
Tirzepatide at a glance
- Also known as
- Mounjaro · Zepbound
- Compound class
- Incretin receptor agonist (peptide)
- Supplied as
- Lyophilized (freeze-dried) powder — dissolved in a diluent before any volume can be drawn · Ready-to-use solution supplied at a concentration stated on the label
- Vial strengths
- 10 mg lyophilized vial — commonly supplied · 15 mg lyophilized vial — commonly supplied · 20 mg lyophilized vial — commonly supplied · 30 mg lyophilized vial — commonly supplied · 60 mg lyophilized vial — commonly supplied · 2.5 mg / 0.5 mL — FDA-approved · 5 mg / 0.5 mL — FDA-approved · 7.5 mg / 0.5 mL — FDA-approved · 10 mg / 0.5 mL — FDA-approved · 12.5 mg / 0.5 mL — FDA-approved · 15 mg / 0.5 mL — FDA-approved
- Regulatory status
- FDA-approved prescription products containing this ingredient are marketed in the United States as ready-to-use solutions, supplied at a concentration fixed by the label rather than mixed by the user. The same ingredient is also supplied as a lyophilized powder in compounded and research presentations, which are reconstituted with a diluent before use; those presentations are not FDA-approved products, and no approved labeling defines a vial strength, a diluent, or a concentration for them.
What Tirzepatide is
Tirzepatide is a synthetic peptide that activates both the GIP receptor and the GLP-1 receptor.
FDA labeling describes it as based on the GIP sequence, containing aminoisobutyric acid at positions 2 and 13, a C-terminal amide, and a lysine at position 20 attached to 1,20-eicosanedioic acid through a linker.
The FDA-approved products, marketed as Mounjaro and Zepbound, are supplied as ready-to-use solutions in single-dose pens and single-dose vials — 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg or 15 mg in 0.5 mL — so their concentration is fixed by the label rather than by anything mixed by the user.
The same ingredient is also supplied as a lyophilized (freeze-dried) powder in compounded and research presentations; those are not FDA-approved products, and the concentration of one is set entirely by the mass in the vial and the volume of diluent added to it.
This page's calculator works from whatever mass and volume you enter and reports the resulting concentration, the volume to draw, and the equivalent insulin-syringe units.
Load a vial strength into the calculator
Each link re-runs the calculator above with that strength's numbers already entered.
Rows marked FDA-approved are strengths stated in approved labeling. Rows marked commonly supplied are vial sizes that compounded and research presentations are commonly supplied in; no approved labeling defines those, and what a given vial contains is only what is printed on that vial.
- 10 mg lyophilized vial — commonly supplied
- 15 mg lyophilized vial — commonly supplied
- 20 mg lyophilized vial — commonly supplied
- 30 mg lyophilized vial — commonly supplied
- 60 mg lyophilized vial — commonly supplied
- 2.5 mg / 0.5 mL — FDA-approved
- 5 mg / 0.5 mL — FDA-approved
- 7.5 mg / 0.5 mL — FDA-approved
- 10 mg / 0.5 mL — FDA-approved
- 12.5 mg / 0.5 mL — FDA-approved
- 15 mg / 0.5 mL — FDA-approved
Tirzepatide calculator questions
How many units is a 5 mg dose of Tirzepatide?
With the example values on this page — 30 mg in 3 mL of bacteriostatic water — the vial works out to 10 mg/mL, so a 5 mg dose is 0.5 mL, which reads as 50 units on a U-100 insulin syringe. Change any field in the calculator above and the computed units change with it.
What does a 30 mg vial of Tirzepatide come out to with different amounts of bacteriostatic water?
Concentration is the mass in the vial divided by the volume it is in, so changing only the volume changes every downstream number: 1.5 mL computes to 20 mg/mL, making a 5 mg dose 0.25 mL (25 units); 3 mL computes to 10 mg/mL, making a 5 mg dose 0.5 mL (50 units); 6 mL computes to 5 mg/mL, making a 5 mg dose 1 mL (100 units). Each figure is arithmetic on the two values stated, not a statement that any of those volumes is the one to use.
How many 5 mg doses are in a 30 mg vial of Tirzepatide?
Dividing 30 mg by 5 mg computes to 6 full doses. Only whole doses are counted — any remainder smaller than a full dose is left out of that figure. Different vial contents or a different dose produce a different count; enter yours in the calculator above.
What concentration is 30 mg of Tirzepatide in 3 mL?
30 mg in 3 mL computes to 10 mg/mL. From that concentration, the volume holding a 5 mg dose is 0.5 mL, or 50 units on a U-100 syringe. This page reports that division; it does not evaluate the numbers you put into it.
How much bacteriostatic water do I add to a vial of Tirzepatide?
That volume is an input to this calculator, not an output of it — this page does not pick a volume for you and nothing here says which one to use. What it can tell you is what each choice computes to: 30 mg with 1.5 mL works out to 20 mg/mL, and the same 30 mg with 6 mL works out to 5 mg/mL. The mass in the vial never changes; only the concentration and the volume you would draw do.
What concentration is a Tirzepatide pen or vial?
A ready-to-use solution has its concentration fixed by its labeling: the mass stated on the pen or vial divided by the volume that pen or vial holds. Its 2.5 mg / 0.5 mL presentation computes to 5 mg/mL. Entering those two numbers in the calculator above reproduces that division and reads the 5 mg draw off an insulin-syringe scale.