Tirzepatide Dosage Calculator — Weekly Titration Schedule & Units Guide
Tirzepatide (marketed as Mounjaro for diabetes and Zepbound for weight loss) is a powerful GLP-1 and GIP receptor agonist that requires careful dose titration. Our free tirzepatide dosage calculator helps you determine the correct number of units for your current dose, accounting for different vial concentrations. Whether you\'re starting your journey or adjusting your maintenance dose, this tool simplifies the math so you can focus on your health goals.
How to Use This Calculator
Select tirzepatide, enter your current dose in milligrams, choose your vial concentration, and the calculator will instantly show you the exact number of units to draw into your syringe. Always verify the concentration on your medication vial before using these results.
⚠️ Research purposes only. Not medical advice.
Always follow your prescribing physician's guidance. This calculator is educational and should not replace professional medical consultation.
Select Medication
Current Week
1
Current Dose
2.50mg
50.0 units on syringe
Next Refill
Week 4
4 doses per vial
Settings
Titration Schedule
| Week Range | Dose (mg) | Volume (units on 100U syringe) | Status |
|---|---|---|---|
| Weeks 1-4 | 2.50 | 50.0 units | ● CURRENT |
| Weeks 5-8 | 5.00 | 100.0 units | Upcoming |
| Weeks 9-12 | 7.50 | 150.0 units | Upcoming |
| Weeks 13-16 | 10.00 | 200.0 units | Upcoming |
| Weeks 17-20 | 12.50 | 250.0 units | Upcoming |
| Week 21+ | 15.00 | 300.0 units | Upcoming |
Vial Tracking
Total per Vial
10mg
Doses per Vial
4
at current dose
Weeks per Vial
4
Next refill: Week 4
This calculator provides estimates for educational purposes. Actual dosing and timing may vary based on individual medical needs and prescriber guidance.
Tirzepatide Titration Schedule Explained
Tirzepatide uses a structured 4-week titration protocol to help your body adapt gradually to the medication and minimize gastrointestinal side effects.
| Week | Dose (mg) | Typical Syringe Reading (10 mg/mL vial) |
|---|---|---|
| Week 1–4 | 2.5 mg | 25 units |
| Week 5–8 | 5 mg | 50 units |
| Week 9–12 | 7.5 mg | 75 units |
| Week 13+ | 10 mg (or higher) | 100 units (or higher) |
After reaching 10 mg, your doctor may increase your dose to 12.5 mg or 15 mg based on your response and tolerance. The entire titration schedule typically spans 4+ months, allowing your digestive system and metabolism to adjust steadily.
How to Calculate Tirzepatide Units
Converting tirzepatide from milligrams to units is straightforward once you know your vial concentration. The formula is simple:
Units = Dose (mg) × Concentration (mg/mL)
Example Calculations
- 5 mg dose with 10 mg/mL vial: 5 × 10 = 50 units
- 7.5 mg dose with 20 mg/mL vial: 7.5 × 20 = 150 units
- 10 mg dose with 5 mg/mL vial: 10 × 5 = 50 units
The same dose can require different unit measurements depending on your vial concentration. Always check your medication label before calculating to ensure accuracy.
Common Vial Concentrations
Tirzepatide vials come in three standard concentrations. Knowing your vial concentration is essential for accurate unit calculations.
5 mg/mL Concentration
The lowest concentration. A single 10 mL vial contains 50 mg of tirzepatide. This concentration is useful for precise dosing at lower dose levels or for patients who prefer smaller injection volumes.
10 mg/mL Concentration
The most common concentration. A 3 mL vial contains 30 mg, making it convenient for standard maintenance dosing (2.5 mg through 10 mg). This is the standard used by Mounjaro and Zepbound.
20 mg/mL Concentration
The highest concentration available. Used primarily for compounded tirzepatide or specialty formulations. Each unit drawn represents more medication, which some patients prefer.
Tips for Managing Side Effects During Dose Increases
As you progress through the tirzepatide titration schedule, side effects are common but typically manageable with proper strategies.
- 1.
Time Your Injections Wisely
Inject on a consistent day each week. Many patients find injecting before bed helps them sleep through initial nausea. Avoid injecting before important meals or social events.
- 2.
Adjust Your Diet Gradually
Reduce portion sizes and avoid fatty, greasy foods. Stick to bland, easy-to-digest meals for 2–3 days after dose increases. Small, frequent meals are often better tolerated than large ones.
- 3.
Stay Hydrated
Drink plenty of water and sugar-free beverages. Dehydration can worsen nausea. Aim for at least 8–10 glasses of water daily, especially after dose increases.
- 4.
Discuss Medications with Your Doctor
If nausea is severe, ask your doctor about antiemetic medications like ondansetron or metoclopramide. They may also recommend slowing your titration schedule if side effects are intolerable.
- 5.
Monitor Your Energy
Side effects typically subside within 3–5 days of injection. If fatigue persists beyond this window, report it to your doctor. Keep a symptom journal to track patterns.
Frequently Asked Questions
The standard starting dose for tirzepatide is 2.5 mg injected subcutaneously once weekly. This low dose helps your body adjust to the medication and minimizes initial side effects.
Tirzepatide doses typically increase every week for the first 4 weeks, following the titration schedule: 2.5 mg (week 1), 5 mg (week 2), 7.5 mg (week 3), and 10 mg (week 4).
Yes! This calculator works with all common vial concentrations: 5 mg/mL, 10 mg/mL, and 20 mg/mL. Enter your vial concentration to get accurate unit measurements for your dose.
The maximum maintenance dose is typically 15 mg once weekly. Some patients may not need this highest dose; your doctor will determine the optimal dose for your weight loss or diabetes management goals.
Multiply your dose (in mg) by the vial concentration. For example: 5 mg dose × 10 mg/mL = 50 units. Always verify the concentration on your vial label before calculating.
The standard schedule applies to most patients, but your doctor may adjust it based on your tolerance, side effects, or medical history. Never change your dosing schedule without medical guidance.
Related Guides & Resources
Medical Disclaimer
This dosage calculator is for educational purposes only and does not replace medical advice from your healthcare provider. Always follow your doctor\'s prescribed dosing schedule. If you experience severe side effects or have questions about your tirzepatide regimen, contact your physician immediately. Do not adjust your dose without explicit medical guidance.