GLP-1 Dose Calculator
Simple, Accurate Syringe Units in Seconds for Semaglutide and Tirzepatide
After more than 20 years studying metabolic health and watching how these medications work in everyday life, one thing stands out above everything else: getting the dose right matters a lot. That is why we built this straightforward tool for you. Just plug in your prescribed dose and the concentration on your vial, and it tells you exactly how many units to draw on a standard U-100 insulin syringe.
Important: This tool is for informational purposes only and is not a substitute for your doctor's advice. Always follow the instructions from your healthcare provider.
Your data is private. We do not store your dose or any personal information.
Why Accurate Dosing Actually Matters
GLP-1 medications like the active ingredients in Ozempic, Wegovy, Mounjaro, and Zepbound are powerful tools for managing blood sugar and supporting weight loss. But they are also strong. They work by slowing digestion, reducing appetite, and helping your body handle glucose better.
Start too high or jump doses too fast and you can feel pretty rough with nausea or other side effects. Go too low for too long and you might not see the results you are hoping for. The sweet spot is slow, steady increases that let your body adjust comfortably. That is exactly why proper dosing and clear calculations make such a big difference in how people feel and how well the medication works for them.
The Core Formula
This converts your milligram dose into the unit markings on a standard U-100 insulin syringe.
Common GLP-1 Medications and Typical Dosing Schedules
Here is a simple breakdown of the most common options used in the US. Doctors usually follow these gradual step-up schedules to help your body adapt. Many people also use a glp 1 weight loss calculator alongside these schedules to track how their body is responding at each dose level.
Semaglutide (Wegovy)
For weight loss. Most common titration schedule:
- Weeks 1 to 40.25 mg once weekly
- Weeks 5 to 80.5 mg once weekly
- Weeks 9 to 121.0 mg once weekly
- Weeks 13 to 161.7 mg once weekly
- Week 17 and beyond2.4 mg once weekly (maintenance)
Ozempic (for type 2 diabetes) starts the same but usually tops out at 0.5 mg, 1 mg, or up to 2 mg depending on your needs.
Tirzepatide (Zepbound / Mounjaro)
Step-up schedule increasing every 4 weeks:
- Weeks 1 to 42.5 mg once weekly
- Weeks 5 to 85 mg once weekly
- Every 4 weeks after7.5 mg / 10 mg / 12.5 mg / 15 mg
Your doctor may keep you at a certain dose longer if you are doing well or having side effects. That is completely normal and often the smartest move.
How to Use the GLP-1 Dose Calculator
It is honestly as easy as it gets. Three inputs, one result:
- 1Enter your prescribed dose in milligrams (mg). This is what your doctor wrote down.
- 2Enter the concentration of your medication in mg/mL. You will find this on your vial label.
- 3Click calculate. That is all there is to it.
Instantly get:
- Exact units to draw on your U-100 insulin syringe
- Volume in mL for double verification
- Clear, easy-to-read result with no confusing math
Many people using compounded versions love this because vial strengths can vary. This keeps things precise and safe week after week.
Why So Many People Get the Units Wrong
Most people struggle with:
- “My vial says 2 mg/mL but my doctor prescribed 0.5 mg. How many units do I draw?
- “The compounding pharmacy changed the concentration. Do I use the same units as before?
- “I do not want to do the math wrong and accidentally give myself too much.
How this calculator solves it:
- Works for any vial concentration, including custom compounded strengths
- Instantly converts your mg dose to exact U-100 syringe units
- Eliminates mental math errors that could affect your safety
- Recalculate in seconds whenever your vial concentration changes
Real Questions People Ask About GLP-1 Dosing
Based on real questions from people using compounded GLP-1 medications, here are the situations that come up most often and how to handle them:
1. “My pharmacy changed the concentration on my new vial. Do I use the same units?”
Absolutely not. The units you draw are directly tied to the concentration. If your vial goes from 1 mg/mL to 2 mg/mL, you will draw half as many units for the same milligram dose. This is one of the most common and dangerous mistakes people make with compounded medications.
The fix: Every time you get a new vial, check the concentration label and run it through this calculator again. It takes about 10 seconds.
2. “I felt terrible after my injection. Did I take too much?”
Not necessarily. Nausea, feeling full quickly, and general discomfort are the most common side effects of GLP-1 medications, especially when you first start or increase the dose. These usually ease up as your body gets used to the medication. However, if symptoms are severe or you suspect you drew the wrong units, contact your prescriber or pharmacist right away.
What helps: Ginger tea, smaller and more frequent meals, avoiding greasy or heavy foods right after your shot, and walking a bit after eating. Many people find symptoms become very manageable once they settle into the right dose.
3. “I missed my injection day. What do I do?”
If you remember within a few days of your scheduled dose, you can typically take it and then resume your normal weekly schedule. If it has been longer or you are close to your next scheduled dose, skip the missed one and continue as normal. Always check with your pharmacist or prescriber for the exact rule on your specific medication, since guidelines can differ slightly between semaglutide and tirzepatide.
4. “My doctor increased my dose but I feel like it is too much. Can I stay at my current dose longer?”
Yes, and this is often the smartest move. The titration schedules listed above are standard starting points, not rigid rules. If you are tolerating your current dose well and feeling good, staying there longer before moving up is a completely valid choice. Talk to your prescriber about staying at the current level for another 4 to 8 weeks.
The principle: Go slow when stepping up. Your body thanks you for it. Most side effects are worst during dose increases, so patience really does pay off.
5. “I am on GLP-1 medication but my weight loss has stalled. What is going on?”
Weight loss plateaus on GLP-1 therapy are real and common. As your body adjusts, appetite suppression can become less noticeable at lower doses. This is often a signal to move to the next dose tier, though your prescriber may also look at other factors like calorie intake, sleep, and stress. Pairing this GLP-1 dose calculator with a dedicated glp 1 weight loss calculator can help you track whether your body is actually responding at each new dose level, so you can have a much more informed conversation with your doctor at your next visit.
6. “How should I store my compounded vial?”
Most compounded semaglutide and tirzepatide vials should be refrigerated between 36 and 46 degrees Fahrenheit and kept away from light. Check with your specific compounding pharmacy for their instructions, as formulations can vary. Never use a vial that has been frozen, looks cloudy when it should be clear, or has visible particles floating in it.
7. “People in my online group seem to be losing weight faster than me. Should I increase my dose?”
Please do not let comparison drive your dosing decisions. GLP-1 response is deeply individual. Genetics, gut microbiome, baseline metabolic rate, sleep quality, stress levels, and other medications all affect how fast you respond. Someone losing 3 lbs per week on the same dose you are using is not evidence that you need more medication. It is evidence that bodies are different.
The better question: Are you tolerating the medication well and seeing any positive changes at all? If yes, stay the course. Dose decisions belong with your prescriber, not your online group.
Practical Tips Learned Over 20 Years in Metabolic Health
These are the things that actually make a difference in how people feel and how well the medication works for them. None of them are complicated, but each one matters more than most people realize.
Inject on the same day each week
Consistency helps keep steady medication levels in your system. Pick a day that works for your schedule and stick to it every week without exception.
Focus on protein with your meals
Protein helps reduce nausea and supports muscle while you are losing fat. Aim for a protein source at every meal, even if your portions are smaller than they used to be.
Stay well hydrated throughout the day
It makes a surprising difference in how you feel overall, especially in the first few weeks. Aim for water spread throughout the day rather than large amounts all at once.
Rotate your injection sites
Common injection sites include the abdomen, outer thigh, and upper arm. Rotating between them helps prevent tissue buildup and keeps absorption consistent over time.
Managing Side Effects the Natural Way
The most common side effects are nausea, feeling full quickly, constipation, or occasional digestive discomfort, especially when you first start or increase the dose. These usually ease up quite a bit as your body gets used to the medication.
Simple things that help a lot: ginger tea, smaller and more frequent meals, avoiding greasy or heavy foods right after your shot, and walking a bit after eating. Many people find symptoms become very manageable once they settle into their right dose and stop increasing it every few weeks.
What Makes This Calculator Different
Built specifically for people using compounded GLP-1 medications:
- Works for any vial concentration, not just standard strengths
- Gives you units AND mL for double verification
- No signup, no email, no personal data collected
- Instant results with no page reload needed
- Mobile-friendly and loads in milliseconds
- 100% private. Nothing is stored anywhere.
Who This Tool Is For
- People using compounded semaglutide or tirzepatide
- Anyone whose vial concentration changed recently
- Patients new to self-injection who want to feel confident
- Anyone stepping up to a new dose and recalculating
- Caregivers helping a family member with their injections
Common Mistakes When Drawing Your GLP-1 Dose
Using last vial's units on a new vial
Always check the concentration of your new vial. A different strength means different units, even for the exact same milligram dose. Never assume it is the same as before.
Guessing instead of calculating
Eyeballing the syringe or estimating units is not safe with medications this potent. The math takes 10 seconds. Run the numbers every single time you draw a dose.
Confusing mg and mL
Milligrams is the dose your doctor prescribed. Milliliters is the volume in the syringe. Concentration in mg/mL is what connects the two. This calculator handles all of it automatically.
Frequently Asked Questions
Frequently Asked Questions
Medical Disclaimer: This calculator is for informational purposes only and should not replace medical advice. Always consult a qualified healthcare provider before adjusting your GLP-1 dose, especially if you have underlying health conditions or are taking other medications.