Tirzepatide Dosage Calculator (Units → mg Converter)
Calculate reconstitution volumes and syringe units for Tirzepatide research peptides
your desired dose per injection
2.5 mg = 2,500 mcg (μg)
corresponds with the size of your vial
amount added to your vial
2.5 mg
50.0 units
4 doses
5.00 mg/mL
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Our general Peptide Calculator works with any research peptide - not just Tirzepatide. For GLP-focused math, compare the Retatrutide Calculator and Semaglutide Calculator. For a combined BPC-157/TB-500 vial, use the BPC-157 TB-500 blend dosage calculator.
How to Use This Tirzepatide Calculator
Select Tirzepatide Dose
Choose the Tirzepatide dose used in your research protocol. Common research dose tiers referenced in the literature are 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, and 15mg.
Enter Vial Size
Input the total Tirzepatide amount in your vial. Tirzepatide research vials are most commonly available in 10mg, 15mg, 20mg, 30mg, and 60mg sizes.
Set Water Volume
Select how much bacteriostatic water you'll add. 2mL is standard for most Tirzepatide research vials; 3mL is also common for higher-strength vials.
Tirzepatide Calculation Formulas
Concentration = Tirzepatide Vial Strength ÷ Water Volume = mg/mL
Units to Draw = (Desired Dose ÷ Concentration) × 100
Doses per Vial = Tirzepatide Vial Strength ÷ Desired Dose
Tirzepatide Dosage Questions
What Tirzepatide dose tiers are referenced in the literature?
Published clinical research on Tirzepatide commonly references a stepped dose schedule starting at 2.5mg and increasing through 5mg, 7.5mg, 10mg, 12.5mg, and 15mg. These tiers are widely used as reference points in laboratory research protocols. This calculator covers all standard tiers.
How much bacteriostatic water should I add to a Tirzepatide vial?
For a 10mg Tirzepatide vial, 2mL of bacteriostatic water is standard, giving a concentration of 5mg/mL (5,000mcg per 100 units). For a 15mg or 20mg vial, 2-3mL is common. Use our Bac Water Calculator for help selecting reconstitution volumes.
What is Tirzepatide?
Tirzepatide is a dual GIP/GLP-1 receptor agonist peptide that has been studied extensively in the literature for its effects on glucose regulation and metabolic markers. It is widely used as a reference compound in research settings. For clinical context, see our compounded tirzepatide guide.
How do I read insulin syringe units?
Insulin syringes (100-unit, 1mL) are marked in units where 100 units = 1mL. Each unit equals 0.01mL. When the calculator says "draw to 25 units," fill the syringe to the 25-unit mark.
How many units is 2.5 mg of Tirzepatide?
At a 5 mg/mL concentration (10 mg vial reconstituted in 2 mL of bacteriostatic water), 2.5 mg of Tirzepatide equals 50 units on a 100-unit insulin syringe. At 2.5 mg/mL it would be 100 units, and at 10 mg/mL it would be 25 units.
How many units is 5 mg of Tirzepatide?
At 5 mg/mL, 5 mg of Tirzepatide equals 100 units (a full 1 mL insulin syringe). At 2.5 mg/mL it equals 200 units (which exceeds a single 1 mL syringe), and at 10 mg/mL it equals 50 units.
How many units is 7.5 mg of Tirzepatide?
At 5 mg/mL, 7.5 mg of Tirzepatide equals 150 units. At 10 mg/mL it equals 75 units. Because 150 units exceeds a 1 mL insulin syringe, researchers using 5 mg/mL concentrations typically draw two syringes or move to a higher-concentration reconstitution.
How many units is 10 mg of Tirzepatide?
At 10 mg/mL, 10 mg of Tirzepatide equals 100 units (one full 1 mL insulin syringe). At 5 mg/mL it equals 200 units, and at 2.5 mg/mL it equals 400 units.
How many units is 12.5 mg of Tirzepatide?
At 10 mg/mL, 12.5 mg of Tirzepatide equals 125 units. At 5 mg/mL it equals 250 units. For higher tiers, a more concentrated reconstitution (10 mg/mL or higher) keeps the draw within a single 1 mL insulin syringe.
How many units is 15 mg of Tirzepatide?
At 10 mg/mL, 15 mg of Tirzepatide equals 150 units. At 5 mg/mL it equals 300 units. Because 15 mg exceeds the volume of a single 1 mL insulin syringe at lower concentrations, researchers commonly use 10 mg/mL or higher when working with 15 mg dose tiers.
Quick Reference: Units to mg
Pre-calculated insulin syringe units (100-unit, 1 mL) for common Tirzepatide research dose tiers at three standard reconstitution concentrations.
| Dose | @ 2.5 mg/mL (e.g. 10 mg in 4 mL) | @ 5 mg/mL (e.g. 10 mg in 2 mL) | @ 10 mg/mL (e.g. 30 mg in 3 mL) |
|---|---|---|---|
| 2.5 mg | 100 units | 50 units | 25 units |
| 5 mg | 200 units | 100 units | 50 units |
| 7.5 mg | 300 units | 150 units | 75 units |
| 10 mg | 400 units | 200 units | 100 units |
| 12.5 mg | 500 units | 250 units | 125 units |
| 15 mg | 600 units | 300 units | 150 units |
Values use the formula units = (mg ÷ concentration) × 100. A standard 100-unit insulin syringe holds a maximum of 1 mL (100 units) per draw.
Standard Tirzepatide Titration Schedule
Stepped weekly dose tiers commonly referenced in published Tirzepatide research literature. Provided as a laboratory reference only.
| Weeks | Reference Dose Tier | Units @ 5 mg/mL |
|---|---|---|
| Weeks 1–4 | 2.5 mg / week | 50 units |
| Weeks 5–8 | 5 mg / week | 100 units |
| Weeks 9–12 | 7.5 mg / week | 150 units |
| Weeks 13–16 | 10 mg / week | 200 units |
| Weeks 17–20 | 12.5 mg / week | 250 units |
| Weeks 21+ | 15 mg / week (max reference tier) | 300 units |
Medical References
Authoritative sources for Tirzepatide prescribing information, clinical trial data, and drug monographs.
- FDA prescribing information for tirzepatide — official Mounjaro label (PDF).
- Mayo Clinic tirzepatide drug information — drug overview, dosing, and precautions.
- manufacturer dosing guidelines — Eli Lilly Mounjaro / Zepbound official site.
- SURMOUNT-1 clinical trial — pivotal Phase 3 tirzepatide weight-management trial (PubMed).
- NIH MedlinePlus drug entry — patient-facing drug monograph.