Tirzepatide calculator
A dual GIP and GLP-1 receptor agonist prescribed for type 2 diabetes and chronic weight management, dosed once weekly.
Also known as: Mounjaro, Zepbound
FDA status FDA-approved as a prescription drug (Mounjaro, Zepbound). Compounded tirzepatide is not FDA-approved and is not reviewed by FDA for safety, effectiveness, or quality.
Calculate your draw
Schedule Tirzepatide → Set your dosing schedule and get a phone notification when each dose is due. Free.
A worked example
A 10 mg vial reconstituted with 2 mL of bacteriostatic water gives 5 mg/mL. A 2500 mcg dose is then 0.5 mL — about 50 units on a 100-unit insulin syringe, giving roughly 4 doses per vial before accounting for residual volume left in the vial and syringe.
Prefer paper? Download the printable Tirzepatide dosing chart (PDF) — every vial size and water volume in syringe units, with the same review byline as this page. All charts →
Commonly cited dose range
Figures circulating for Tirzepatide run from 2500 mcg to 15000 mcg. Commonly discussed protocols begin at the lowest step and increase no faster than every four weeks. Weekly dosing.
Read this as reference information, not instruction. These numbers describe what is commonly discussed, not what is right for any individual. Dose, frequency, and whether to use Tirzepatide at all are decisions for a licensed clinician who knows your history.
Common questions
How many units is 2.5 mg of tirzepatide?
It depends entirely on the concentration. In a 10 mg vial reconstituted with 2 mL of bacteriostatic water (5 mg/mL), 2.5 mg is 0.5 mL — 50 units on a 100-unit insulin syringe. Change the water volume and that number changes.
How much water goes into a 10 mg tirzepatide vial?
Common choices are 1 mL or 2 mL. 2 mL yields 5 mg/mL, which puts typical starting doses in an easy-to-read range on an insulin syringe. The water volume is a measurement convenience, not part of the dose.
Can I use the same calculator for compounded and branded tirzepatide?
The arithmetic is identical for any lyophilized vial. Branded pens are pre-filled and pre-measured, so no reconstitution math applies to them at all.