Tirzepatide Dosage Calculator & Chart
Printed on the vial label.
1 mg = 1,000 mcg. Enter your own prescribed or planned amount.
Draw on your syringe
50units= 0.5 mL
- Concentration
- 5,000mcg/mL
- Each unit
- 50 mcg
- Doses per vial
- 4
- Vial lasts
- 4weeks
Want a rounder number to draw?
Show the math
- Concentration = 10 mg × 1,000 ÷ 2 mL = 5,000 mcg/mL
- Volume = 2,500 mcg ÷ 5,000 mcg/mL = 0.5 mL
- Units = 0.5 mL × 100 = 50 units (U-100: 100 units = 1 mL)
The pre-filled dose (2.5 mg) is an example input so the calculator shows a result. It is not a recommendation.
Tirzepatide dosage chart (in units)
Units to draw for each dose at your current mix (10 mg vial + 2 mL water). Escalation schedule from the Zepbound / Mounjaro prescribing information: start at 2.5 mg weekly, increase in 2.5 mg steps after at least 4 weeks on the current dose.
| Period | Dose | Units (U-100) | mL |
|---|---|---|---|
| Weeks 1–4 | 2.5 mg | 50 | 0.5 |
| Weeks 5–8 | 5 mg | 100 | 1 |
| Weeks 9–12 | 7.5 mg | 150>1 mL | 1.5 |
| Weeks 13–16 | 10 mg | 200>1 mL | 2 |
| Weeks 17–20 | 12.5 mg | 250>1 mL | 2.5 |
| Week 21+ (max) | 15 mg | 300>1 mL | 3 |
Tirzepatide units chart
Units to draw on a U-100 syringe for common Tirzepatide vial sizes, each mixed with 2 mL of bacteriostatic water. Change the water in the calculator and this table updates.
| Dose | 5 mg vial | 10 mg vial | 15 mg vial | 20 mg vial | 30 mg vial | 60 mg vial |
|---|---|---|---|---|---|---|
| 2.5 mg | 100 | 50 | 33.3 | 25 | 16.7 | 8.3 |
| 5 mg | >100 | 100 | 66.7 | 50 | 33.3 | 16.7 |
| 7.5 mg | >100 | >100 | 100 | 75 | 50 | 25 |
| 10 mg | >100 | >100 | >100 | 100 | 66.7 | 33.3 |
| 12.5 mg | >100 | >100 | >100 | >100 | 83.3 | 41.7 |
| 15 mg | >100 | >100 | >100 | >100 | 100 | 50 |
Values are units on a U-100 insulin syringe (100 units = 1 mL). ">100" means the dose does not fit in a 1 mL syringe at this dilution.
About Tirzepatide
Tirzepatide is a once-weekly GIP and GLP-1 receptor agonist, FDA-approved as Mounjaro (type 2 diabetes) and Zepbound (chronic weight management, obstructive sleep apnea).
Regulatory status: FDA-approved as Mounjaro and Zepbound pens and vials. Use only as prescribed. Compounded or "research" vials are not FDA-approved products.
Also searched as: tirz, Mounjaro, Zepbound.
How to reconstitute Tirzepatide
- Wash your hands and let the vial reach room temperature.
- Wipe the rubber stoppers of the peptide vial and the bacteriostatic water with an alcohol pad.
- Draw the planned amount of bacteriostatic water (for example 2 mL — that is 200 units on a 1 mL syringe).
- Inject the water slowly down the inside wall of the vial, not directly onto the powder.
- Gently swirl or roll the vial until the powder dissolves. Do not shake.
- Label the vial with the date and the concentration shown by the calculator, and store it as the product label directs (reconstituted peptides are normally kept refrigerated).
These are general handling steps, not medical instructions. If your product came with instructions from a pharmacy or prescriber, follow those.
What you need
Bacteriostatic water
Sterile water with 0.9% benzyl alcohol, used to dissolve the powder.
U-100 insulin syringes
0.3 mL syringes are easiest to read for small doses; 1 mL for larger ones.
Alcohol prep pads
Wipe the vial stopper before every draw.
Sharps container
For safe disposal of used needles.
- Which syringes and supplies to buy →
Tirzepatide calculator FAQ
How many units is 2.5 mg of Tirzepatide?
+
It depends on how much water you add. With a 10 mg vial mixed with 2 mL of bacteriostatic water, the concentration is 5,000 mcg/mL, so 2.5 mg is 0.5 mL = 50 units on a U-100 insulin syringe. With a 60 mg vial and the same 2 mL of water it is 8.3 units.
How much water should I add to a 10 mg Tirzepatide vial?
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The water volume does not change the total amount of Tirzepatide; it only sets the concentration. Common choices are 1–3 mL. With 2 mL, each unit on a U-100 syringe holds 50 mcg. Pick a volume that makes your dose easy to read on the syringe — the calculator above suggests volumes that land on round numbers.
How many doses are in a 10 mg vial of Tirzepatide?
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At 2.5 mg per injection, a 10 mg vial contains 4 full doses. The amount of water you add does not change this number.
What is the Tirzepatide dosage schedule?
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Escalation schedule from the Zepbound / Mounjaro prescribing information: start at 2.5 mg weekly, increase in 2.5 mg steps after at least 4 weeks on the current dose. The dosage chart above converts each step into units for your vial. Follow your prescriber's instructions.
Is Tirzepatide approved?
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FDA-approved as Mounjaro and Zepbound pens and vials. Use only as prescribed. Compounded or "research" vials are not FDA-approved products.
Sources
- Zepbound (tirzepatide) prescribing information — DailyMed
- Jastreboff AM et al. Tirzepatide once weekly for the treatment of obesity. N Engl J Med. 2022;387:205-216.
Calculator math: concentration = vial mg × 1,000 ÷ water mL; units = dose ÷ concentration × 100 (U-100 syringe). Data and references last reviewed 2026-10-10.