Tirzepatide Calculator
Convert a dose of Tirzepatide into syringe units. Enter the vial size, the bacteriostatic water added and the dose on your prescription.
Enter the vial size and the water you added.
Arithmetic only. This tool does not recommend a dose; use the one your prescriber gave you.
About Tirzepatide
Tirzepatide is a dual GIP and GLP-1 receptor agonist.
FDA-approved as a prescription medicine (Mounjaro, Zepbound). Compounded versions are not FDA-approved.
Mounjaro and Zepbound are supplied as pre-filled pens or as vials of ready-made solution. Neither is reconstituted, and the pens do not use a separate syringe. This calculator applies only to tirzepatide dispensed as a powder vial, or as a solution with a stated mg/mL on the label.
Tirzepatide concentration chart
Concentration for common vial sizes at 1, 2, 3 and 5 mL of water, with the amount held in every 10 units of a U-100 syringe.
| Vial | 1 mL water | 2 mL water | 3 mL water | 5 mL water |
|---|---|---|---|---|
| 5 mg | 5 mg/mL · 0.5 mg (500 mcg) per 10 units | 2.5 mg/mL · 0.25 mg (250 mcg) per 10 units | 1.667 mg/mL · 0.1667 mg (166.7 mcg) per 10 units | 1 mg/mL · 0.1 mg (100 mcg) per 10 units |
| 10 mg | 10 mg/mL · 1 mg per 10 units | 5 mg/mL · 0.5 mg (500 mcg) per 10 units | 3.333 mg/mL · 0.3333 mg (333.3 mcg) per 10 units | 2 mg/mL · 0.2 mg (200 mcg) per 10 units |
| 15 mg | 15 mg/mL · 1.5 mg per 10 units | 7.5 mg/mL · 0.75 mg (750 mcg) per 10 units | 5 mg/mL · 0.5 mg (500 mcg) per 10 units | 3 mg/mL · 0.3 mg (300 mcg) per 10 units |
| 20 mg | 20 mg/mL · 2 mg per 10 units | 10 mg/mL · 1 mg per 10 units | 6.667 mg/mL · 0.6667 mg (666.7 mcg) per 10 units | 4 mg/mL · 0.4 mg (400 mcg) per 10 units |
| 30 mg | 30 mg/mL · 3 mg per 10 units | 15 mg/mL · 1.5 mg per 10 units | 10 mg/mL · 1 mg per 10 units | 6 mg/mL · 0.6 mg (600 mcg) per 10 units |
| 40 mg | 40 mg/mL · 4 mg per 10 units | 20 mg/mL · 2 mg per 10 units | 13.33 mg/mL · 1.333 mg per 10 units | 8 mg/mL · 0.8 mg (800 mcg) per 10 units |
| 60 mg | 60 mg/mL · 6 mg per 10 units | 30 mg/mL · 3 mg per 10 units | 20 mg/mL · 2 mg per 10 units | 12 mg/mL · 1.2 mg per 10 units |
Units per 1 mg of Tirzepatide
How many units on a U-100 syringe hold 1 mg, for each vial size and water volume. 1 mg is a round reference amount for scaling, not a dose: multiply or divide to match the dose on your prescription, or use the calculator.
| Vial | 1 mL water | 2 mL water | 3 mL water | 5 mL water |
|---|---|---|---|---|
| 5 mg | 20 units | 40 units | 60 units | 100 units |
| 10 mg | 10 units | 20 units | 30 units | 50 units |
| 15 mg | 6.667 units | 13.33 units | 20 units | 33.33 units |
| 20 mg | 5 units | 10 units | 15 units | 25 units |
| 30 mg | 3.333 units | 6.667 units | 10 units | 16.67 units |
| 40 mg | 2.5 units | 5 units | 7.5 units | 12.5 units |
| 60 mg | 1.667 units · too small to read reliably | 3.333 units | 5 units | 8.333 units |
Tirzepatide dispensed as a liquid
Some pharmacies dispense Tirzepatide already in solution, with the concentration printed on the label as mg/mL. No water is added, so the label figure is the concentration. The rows below are example label concentrations; use the one on your vial. The columns show how much each syringe marking holds, and the marking that holds 1 mg, a round reference amount rather than a dose.
| Label concentration | In 1 unit | In 10 units | In 50 units | 1 mg = |
|---|---|---|---|---|
| 5 mg/mL | 0.05 mg · 50 mcg | 0.5 mg · 500 mcg | 2.5 mg | 20 units |
| 10 mg/mL | 0.1 mg · 100 mcg | 1 mg | 5 mg | 10 units |
| 15 mg/mL | 0.15 mg · 150 mcg | 1.5 mg | 7.5 mg | 6.667 units |
| 20 mg/mL | 0.2 mg · 200 mcg | 2 mg | 10 mg | 5 units |
| 30 mg/mL | 0.3 mg · 300 mcg | 3 mg | 15 mg | 3.333 units |
| 40 mg/mL | 0.4 mg · 400 mcg | 4 mg | 20 mg | 2.5 units |
More concentrations: mg/mL to units chart.
Questions
How do I calculate Tirzepatide units on a syringe?
Divide the mg in the vial by the mL of water added to get mg/mL. Divide your prescribed dose by that figure for mL, then multiply by 100 for units on a U-100 syringe. For example, a 10 mg vial with 2 mL of water is 5 mg/mL, so every 10 units holds 0.5 mg (500 mcg).
How many units is 1 mg of Tirzepatide?
It depends on the vial size and the water added. With a 10 mg vial, 1 mg is 10 units after 1 mL of water, 20 units after 2 mL of water, 30 units after 3 mL of water. The lookup table above covers the other vial sizes.
Is Tirzepatide measured in mg or mcg?
Tirzepatide vials are labelled in mg. If your prescription is written in mcg, divide by 1,000 to get mg, or switch the dose field to mcg. In a 10 mg vial mixed with 2 mL, one unit on the syringe holds 0.05 mg (50 mcg).
Does this calculator apply to Mounjaro and Zepbound pens?
Mounjaro and Zepbound are supplied as pre-filled pens or as vials of ready-made solution. Neither is reconstituted, and the pens do not use a separate syringe. This calculator applies only to tirzepatide dispensed as a powder vial, or as a solution with a stated mg/mL on the label.
My Tirzepatide vial is already a liquid. How do I calculate units?
Use the mg/mL printed on the label. Divide the dose in mg by that figure for mL, then multiply by 100 for units. In the calculator, enter the mg/mL as the amount in the vial and 1 mL as the water. At 10 mg/mL, every 10 units holds 1 mg.
How much bacteriostatic water do I add to Tirzepatide?
Follow the amount on your pharmacy label. The volume of water does not change how much Tirzepatide is in the vial; it only changes how many units a given dose takes up. Enter whatever amount was actually added.
What Tirzepatide dose should I enter?
The dose written on your prescription. This page converts a dose into syringe units and does not recommend one.
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