How many units is 5 mg of tirzepatide?

In a 30 mg vial with 3 mL of water the concentration is 10 mg/mL, so 5 mg is 0.5 mL, which is 50 units on a U-100 syringe. In a 10 mg vial with 2 mL it is 5 mg/mL, so 5 mg is 100 units, a full syringe.

How much water for a 30 mg tirzepatide vial?

3 mL is common and gives 10 mg/mL, so the whole 2.5 to 15 mg ladder lands between 25 and 150 units. Doses above 10 mg will exceed a 1 mL syringe at that concentration, so use less water if you are running high.

How many doses in a 60 mg vial?

Divide 60 by your weekly dose. At 5 mg that is 12 doses, or 84 days. At 15 mg it is 4 doses.

Is compounded tirzepatide the same as the licensed product?

No. Concentration, excipients and quality control differ. Anything you reconstitute yourself is at a concentration you chose, so unit counts from a pen do not transfer.

Tirzepatide dosage calculator

The whole 2.5 to 15 mg ladder, converted into the mark on your syringe. Works for 10, 20, 30 and 60 mg vials.

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ReviewedDose ranges and half-life figures last checked 29 August 2026.

Dose to units, at the standard setup

Dose	Draw	U-100 units	Doses per vial	Vial lasts
2.5 mg	0.25 mL	25 units	12	84 days
5 mg	0.5 mL	50 units	6	42 days
7.5 mg	0.75 mL	75 units	4	28 days
10 mg	1 mL	100 units	3	21 days
12.5 mg	1.25 mL	125 units	2	14 days
15 mg	1.5 mL	150 units	2	14 days

Based on a 30 mg vial reconstituted with 3 mL of bacteriostatic water, which is 10 mg/mL, drawn on a standard U-100 insulin syringe.

About the numbers above

Tirzepatide is a dual GIP and GLP-1 receptor agonist. The licensed titration ladder steps every four weeks: 2.5, 5, 7.5, 10, 12.5 and 15 mg once weekly, with 2.5 mg treated as a starting dose rather than a maintenance one.

Note that the licensed product is a pre-filled pen at a fixed concentration. Reconstituting a vial yourself means you set the concentration, so the unit numbers below will not match anything printed on a pen.

Common vial and water combinations


Vial	BAC water	Concentration	Draw	U-100 units	Doses/vial
10 mg	1 mL	10 mg/mL	0.5 mL	50 units	2
10 mg	2 mL	5 mg/mL	1 mL	100 units	2
10 mg	3 mL	3.33 mg/mL	1.5 mL	150 units	2
30 mg	1 mL	30 mg/mL	0.167 mL	16.7 units	6
30 mg	2 mL	15 mg/mL	0.333 mL	33.3 units	6
30 mg	3 mL	10 mg/mL	0.5 mL	50 units	6
60 mg	1 mL	60 mg/mL	0.083 mL	8.3 units	12
60 mg	2 mL	30 mg/mL	0.167 mL	16.7 units	12
60 mg	3 mL	20 mg/mL	0.25 mL	25 units	12

All rows above assume a 5 mg dose and a standard U-100 insulin syringe, where 100 units = 1 mL.

How long it stays in you

The half-life of Tirzepatide is about 5 days. That is the time for the amount in your blood to halve, so after one half-life you are at 50 percent of the peak, after two you are at 25 percent, and after four you are at roughly 6 percent. This is why a weekly compound still has meaningful levels present when the next dose lands, and why levels build over the first several weeks before they settle.

Free: The Protocol Pack, 25 printable pages. Including the part no other site writes down: what to do when you have already got it wrong. Wrong water volume, shook the vial, left it out overnight, drew the wrong units. Plus dosing cards for twelve compounds, titration planners and a vial log. Get it free.

Calculators by compound

RetatrutideVial, water and weekly dose to syringe units TirzepatideThe 2.5 to 15 mg ladder, converted SemaglutideThe 0.25 to 2.4 mg ladder, converted BPC-157mcg doses from a 5 or 10 mg vial ReconstitutionHow much water to add, and why it matters Dosing chartsPrintable unit tables for every compound Titration schedulesFull ladders with units at every step Reading a syringeU-100 vs U-40, and the 2.5x error How much water?Pick a volume that lands where you can read it

Common questions

How many units is 5 mg of tirzepatide?: In a 30 mg vial with 3 mL of water the concentration is 10 mg/mL, so 5 mg is 0.5 mL, which is 50 units on a U-100 syringe. In a 10 mg vial with 2 mL it is 5 mg/mL, so 5 mg is 100 units, a full syringe.
How much water for a 30 mg tirzepatide vial?: 3 mL is common and gives 10 mg/mL, so the whole 2.5 to 15 mg ladder lands between 25 and 150 units. Doses above 10 mg will exceed a 1 mL syringe at that concentration, so use less water if you are running high.
How many doses in a 60 mg vial?: Divide 60 by your weekly dose. At 5 mg that is 12 doses, or 84 days. At 15 mg it is 4 doses.
Is compounded tirzepatide the same as the licensed product?: No. Concentration, excipients and quality control differ. Anything you reconstitute yourself is at a concentration you chose, so unit counts from a pen do not transfer.

Read this before you use the numbers. This is a unit-conversion tool. It converts a vial strength and a volume of bacteriostatic water into a concentration, a draw volume and a mark on an insulin syringe. It does not tell you what to take, whether to take it, or whether a compound is safe for you. Most of the compounds listed here are sold for laboratory research use and are not approved for human use. Nothing on this site is medical advice. Dosing decisions belong with a licensed clinician who knows your history. Always confirm the strength printed on your own vial rather than trusting a preset.