Quick answer: To convert a Tirzepatide dose to units, divide your vial size (mg) by the bacteriostatic water (mL) to get the concentration, then units = (dose ÷ concentration) × 100. A 5mg dose from a 30mg vial in 3mL is 50 units on a U-100 syringe.
Tirzepatide dosing in units, explained
When you reconstitute a Tirzepatide vial, your dose in milligrams (mg) has to be converted into units on a U-100 insulin syringe before you can draw it. There is no single conversion: the same 5 mg dose is a different number of units depending on how much bacteriostatic water you added, because that sets the concentration. The calculator above does this for your exact vial; the reference table below covers the most common setups.
This is also why a generic chart can mislead you: a unit count only means something once it is tied to your concentration. Always confirm the number against your own vial before drawing.
Tirzepatide dose-to-units reference (30 mg vial)
| Dose | 30.0 mg/mL (30mg + 1mL) |
15.0 mg/mL (30mg + 2mL) |
|---|---|---|
| 2.5 mg | 8.3 units (0.083 mL) | 16.7 units (0.167 mL) |
| 5 mg | 16.7 units (0.167 mL) | 33.3 units (0.333 mL) |
| 7.5 mg | 25.0 units (0.25 mL) | 50.0 units (0.5 mL) |
| 10 mg | 33.3 units (0.333 mL) | 66.7 units (0.667 mL) |
| 12.5 mg | 41.7 units (0.417 mL) | 83.3 units (0.833 mL) |
| 15 mg | 50.0 units (0.5 mL) | 100.0 units (1.0 mL) |
Any result over 100 units exceeds a single U-100 syringe. Use a higher concentration (less water) or split the dose into two draws.
Worked example
Take a 30 mg vial and add 1 mL of bacteriostatic water. That gives 30.0 mg/mL. For a 5 mg dose: (5 ÷ 30.0) × 100 = 16.7 units on a U-100 syringe (0.167 mL). Draw to that mark.
Frequently asked questions
How do you convert a Tirzepatide dose in mg to insulin syringe units?
Find your concentration: divide the vial size (mg) by the bacteriostatic water added (mL). Then units = (dose ÷ concentration) × 100. A 30mg vial in 2mL is 15.0 mg/mL, so a 5mg dose = 33.3 units.
How many units is my Tirzepatide dose?
It depends entirely on how you reconstituted the vial. The same mg dose can be a different number of units depending on the water volume you used. Enter your exact vial size, water, and dose above for the precise answer.
What is a U-100 insulin syringe unit in mL?
On a U-100 syringe, 100 units = 1 mL. So 50 units = 0.5 mL, 20 units = 0.2 mL, and 10 units = 0.1 mL.
Safety: Tirzepatide is the active ingredient in FDA-approved GLP-1 medications. This tool is educational only. Always double-check your own math and follow a licensed provider's instructions before injecting.