Semaglutide Dosage Calculator — Titration Schedule & Injection Units Guide
Semaglutide (marketed as Ozempic for type 2 diabetes and Wegovy for weight loss) is a GLP-1 receptor agonist that transforms blood sugar control and body composition through a carefully structured titration protocol. Our free semaglutide dosage calculator helps you determine the correct units for your current dose, whether you\'re using brand-name pens or working with compounded semaglutide vials. From your first 0.25 mg injection through maintenance therapy, this tool ensures you\'re drawing the precise amount needed.
How to Use This Calculator
Select semaglutide, enter your current dose in milligrams, select your medication type (brand-name or compounded), and the calculator will show you the exact units to draw. For brand-name pens, verify the dose display on your pen. For compounded vials, always confirm the concentration on your bottle label.
⚠️ 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
0.25mg
10.0 units on syringe
Next Refill
Week 20
20 doses per vial
Settings
Titration Schedule
| Week Range | Dose (mg) | Volume (units on 100U syringe) | Status |
|---|---|---|---|
| Weeks 1-4 | 0.25 | 10.0 units | ● CURRENT |
| Weeks 5-8 | 0.50 | 20.0 units | Upcoming |
| Weeks 9-12 | 1.00 | 40.0 units | Upcoming |
| Weeks 13-16 | 1.70 | 68.0 units | Upcoming |
| Week 17+ | 2.40 | 96.0 units | Upcoming |
Vial Tracking
Total per Vial
5mg
Doses per Vial
20
at current dose
Weeks per Vial
20
Next refill: Week 20
This calculator provides estimates for educational purposes. Actual dosing and timing may vary based on individual medical needs and prescriber guidance.
Semaglutide Titration Schedule
Semaglutide uses a structured 16-week titration schedule to help your body adapt to the medication and allow your doctor to assess your response at each dose level.
| Weeks | Dose (mg) | Phase |
|---|---|---|
| 1–4 | 0.25 mg | Initial titration |
| 5–8 | 0.5 mg | Dose escalation 1 |
| 9–12 | 1 mg | Dose escalation 2 |
| 13+ | 2.4 mg (or lower) | Maintenance |
After 16 weeks on semaglutide, most patients reach the 2.4 mg maintenance dose. However, some patients respond well to lower doses (0.5 mg or 1 mg) and may remain on these indefinitely. Your doctor will determine the optimal dose based on your metabolic response, side effects, and weight loss or diabetes management goals.
The entire titration is designed to minimize gastrointestinal side effects while steadily increasing the medication\'s therapeutic effect. Never skip weeks or jump to higher doses without explicit medical guidance.
How to Calculate Semaglutide Injection Units
If you\'re using compounded semaglutide vials, converting milligrams to units is essential for safe injection. Brand-name pens display the dose directly, so no calculation is needed.
Brand-Name Semaglutide (Ozempic/Wegovy Pens)
Brand-name pens are prefilled and come with dial-up doses. Simply twist the dose selector to your prescribed amount and inject. No unit calculations needed—the pen handles everything. Always verify the dose window shows the correct amount before injecting.
Compounded Semaglutide (Vials)
Units = Dose (mg) ÷ Concentration (mg/mL) × 100
(This formula converts mL to units on a standard 100-unit insulin syringe. Different syringes may require adjustment.)
Example Calculations
- 0.5 mg dose with 3.33 mg/mL concentration: 0.5 ÷ 3.33 × 100 = 15 units
- 1 mg dose with 5 mg/mL concentration: 1 ÷ 5 × 100 = 20 units
- 2.4 mg dose with 3 mg/mL concentration: 2.4 ÷ 3 × 100 = 80 units
Always double-check your vial concentration and syringe type before calculating. Inaccurate unit measurements can affect your medication\'s effectiveness.
Compounded vs Brand-Name Semaglutide Dosing
Both options deliver semaglutide, but they differ in preparation, cost, convenience, and dosing requirements. Understanding these differences helps you make an informed choice with your healthcare provider.
Brand-Name Semaglutide (Ozempic/Wegovy)
- ✓Prefilled pens with exact dose display—no calculations required
- ✓FDA-approved with extensive clinical testing and safety data
- ✓Consistent pharmaceutical quality and sterility standards
- ✗Higher cost; typically $900–$1,500 per month without insurance
- ✗Supply chain shortages can occur periodically
Compounded Semaglutide (Vials)
- ✓Significantly lower cost—often $150–$350 per month
- ✓Greater availability; can be customized by compounding pharmacies
- ✓Flexible dosing—pharmacist can create virtually any dose
- ✗Requires manual unit calculations for accurate dosing
- ✗Quality and sterility depend on the compounding pharmacy\'s standards
- ✗Less extensive clinical safety data compared to brand-name
Managing the Transition Between Doses
Each dose increase in the semaglutide titration schedule is an important milestone. Proper management of the transition period helps minimize side effects and ensures your body adapts smoothly to higher doses.
The First Few Days After a Dose Increase
Expect mild nausea, reduced appetite, and fatigue as your body adjusts. These symptoms typically peak on day 2–3 and resolve by day 5–6. Stick to bland foods, stay hydrated, and avoid strenuous exercise during this window.
Dietary Strategy During Transitions
For 3–4 days after a dose increase, prioritize easy-to-digest foods: boiled chicken, rice, toast, broths, and vegetables. Avoid dairy, high-fat foods, and anything greasy. Ginger tea and electrolyte drinks can help with nausea.
When to Contact Your Doctor
If nausea persists beyond 7 days, you experience vomiting, have severe abdominal pain, or develop signs of pancreatitis (upper abdominal pain radiating to the back), contact your healthcare provider immediately. These symptoms warrant medical evaluation.
Stabilization Phase
By day 7–10 after a dose increase, most side effects resolve and you'll enter a stable phase. This is when you truly experience the medication\'s appetite-suppressing effects and begin seeing weight loss or improved glucose control.
Frequently Asked Questions
The standard starting dose is 0.25 mg injected subcutaneously once weekly. This low dose allows your body to adapt to the medication while minimizing nausea and other common side effects.
Semaglutide typically follows a 16-week titration schedule: 0.25 mg for 4 weeks, 0.5 mg for 4 weeks, 1 mg for 4 weeks, and 2.4 mg thereafter. Some patients continue higher doses under medical supervision.
Yes! This calculator works for both medications because they contain the same active ingredient, semaglutide. The main difference is that Ozempic is indicated for diabetes and Wegovy for weight loss, but the dosing is equivalent.
Brand-name semaglutide (Ozempic/Wegovy) comes in prefilled pens with fixed doses. Compounded semaglutide is custom-made by pharmacies and may come in vials with different concentrations, requiring unit calculations.
Multiply your dose (in mg) by the vial concentration. For example: 0.5 mg dose × 3.33 mg/mL (typical concentration) = 1.67 mL, or approximately 50 units on a standard insulin syringe.
Not without medical guidance. The titration schedule is designed to help your body adjust gradually. Skipping weeks or jumping to higher doses increases nausea and side effects. If you need to pause, discuss it with your doctor.
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, have questions about your semaglutide regimen, or believe you\'re having an adverse reaction, contact your physician immediately. Do not adjust your dose without explicit medical guidance.