Printed on the vial label, for example 2.5 mg/mL.
Syringe size (U-100)
Draw to
25 units
- Your dose
- 2500 mcg = 2.5 mg
- Volume
- 0.25 mL
- Concentration
- 10 mg/mL
| 5 units | 0.5 mg |
|---|---|
| 10 units | 1 mg |
| 20 units | 2 mg |
| 30 units | 3 mg |
| 50 units | 5 mg |
The starting values are examples. Replace them with what is on your vial label and prescription. This tool does the arithmetic only and does not recommend a dose.
Units depend on the vial, not just the dose
Tirzepatide doses are written in mg. A syringe measures volume in units. The concentration on the label connects the two, and it varies between pharmacies and refills.
The table under the result shows what each mark holds at your concentration. Use it to check the answer: find the mark nearest the result and confirm the mg shown matches your dose.
Before you draw
- Read the concentration on this vial, not the last one.
- Confirm the dose in mg with your prescription.
- Compare the result here with the instructions from your pharmacy. If they disagree, call the pharmacy.
This page does not give a dosing schedule. Your dose and any increases come from your prescriber. See the safety notes.
Common questions
How many units is my tirzepatide dose?
Divide your dose in mg by the concentration on the vial in mg/mL, then multiply by 100. At 10 mg/mL, a 2.5 mg dose is 25 units; at 20 mg/mL the same dose is 12.5 units.
Does this apply to Mounjaro or Zepbound pens?
No. Pens deliver a fixed dose. Brand single-dose vials are also filled for one dose, so follow the instructions that come with them. This calculator is for multi-dose vials drawn up with an insulin syringe.
My result is not a whole number of units. What now?
Try a syringe with finer marks: 30 and 50-unit syringes are marked every unit, while 100-unit syringes are marked every 2. If the draw still falls between marks, ask your pharmacy how to measure it.