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✦ Based on clinical trial data

How Much Weight Could You Lose on Ozempic or Mounjaro?

Enter your details and see a personalised estimate based on real clinical trial results from the STEP and SURMOUNT trials.

1
Choose your medication
2
Your details
kg
Your Estimated Results
0 → 0
Based on average clinical trial results
Est. Loss
0
kg lost
% Body Weight
0%
average result
Timeline
0
months (approx)
Progress Timeline

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⚠️ This calculator is for informational purposes only and is not medical advice. Results are estimates based on average clinical trial outcomes — individual results vary significantly. GLP-1 medications require a prescription from a licensed healthcare provider. Always consult your doctor before starting any medication.
Step 1 — Your medication
Step 2 — Your current week of treatment
Your current dose
1 mg
Once weekly injection — standard maintenance dose
Next dose
2 mg
Pen to use
1 mg pen
Injection frequency
Once weekly
Full dose escalation schedule
Always follow your doctor's prescribed schedule. Never increase your dose without medical guidance. This tool is for reference only and does not replace professional medical advice.
Pen Clicks to Dose Converter
How many clicks on the pen equals your prescribed dose?
Medication & pen
Your prescribed dose
Number of clicks
—
Select your pen and dose above
Always confirm the correct number of clicks with your pharmacist or prescriber. Pen mechanisms can vary between brands and batches. Never inject more than your prescribed dose.
Step 1 — Your medication
Step 2 — Your country
Estimated monthly cost
—
Select medication and country above
Per injection
—
Annual cost
—
Script type
—
Prices are estimates based on average private prescription costs and may vary by pharmacy, dose, and insurance coverage. PBS/insurance subsidies may significantly reduce costs. Always check with your pharmacy for current pricing.
Step 1 — Your details
Your weight
Activity level
Daily protein target
—
Enter your weight above
Minimum (sedentary)
—
Optimal (active)
—
Per meal (3 meals)
—
Why protein matters on GLP-1
Preserve muscle mass
GLP-1 medications reduce appetite — eating too little protein causes muscle loss, not just fat loss
Support metabolism
Adequate protein keeps your metabolic rate higher during weight loss
Reduce side effects
High protein foods tend to be more filling and reduce nausea on GLP-1 medications
Best sources
Chicken, fish, eggs, Greek yoghurt, cottage cheese, legumes, tofu
Based on research recommendations of 1.2–1.6g protein per kg body weight for people on GLP-1 medications. Consult your healthcare provider or dietitian for personalised advice.
Step 1 — Your medication
Step 2 — How many days since your scheduled injection?
What to do
Select above
Choose your medication and how many days have passed
This guidance is based on FDA/TGA prescribing information for semaglutide and tirzepatide. Always confirm with your prescriber or pharmacist. Never double dose.
+ What to eat while on GLP-1

GLP-1 medications reduce appetite — but eating too little causes muscle loss. Here are your daily nutrition targets.

kg
Daily Calories
—
cal/day target
Daily Protein
—
grams/day min
Water
—
litres/day

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Common Questions
How much weight can I lose on Ozempic (semaglutide)?
Clinical trials (STEP program) show average weight loss of around 13.7% of body weight on Wegovy (semaglutide 2.4mg) over 68 weeks. At lower Ozempic doses used for diabetes, average loss is typically 6–9%. Individual results vary significantly based on diet, exercise and adherence.
Is Mounjaro better than Wegovy for weight loss?
According to the 2025 SURMOUNT-5 head-to-head trial published in the New England Journal of Medicine, tirzepatide (Mounjaro/Zepbound) produced average weight loss of 20.2% compared to 13.7% for semaglutide (Wegovy) — a 47% greater relative difference. However, both are highly effective medications.
How quickly do GLP-1 medications work?
Most people see initial results within 4–8 weeks. Significant weight loss typically builds over 3–6 months as doses are gradually increased. Peak results are usually seen at 12–18 months of consistent use.
Will I regain weight if I stop taking Ozempic or Mounjaro?
Clinical trials showed that most people regain a significant portion of lost weight when stopping these medications. However, a 2026 Cleveland Clinic real-world study of nearly 8,000 patients found better outcomes than trials suggested, as many patients restart medication or transition to lifestyle changes.
Do I need a prescription for GLP-1 weight loss medications?
Yes. Ozempic, Wegovy, Mounjaro and Zepbound all require a prescription from a licensed healthcare provider. They are approved for specific conditions — speak to your doctor about whether they're appropriate for you.
How much does Ozempic cost in Australia?
For type 2 diabetes patients, Ozempic is subsidised on the PBS at around $25–$31.60 per script (concession card holders pay ~$7.70). For weight loss use without diabetes, it's not PBS-subsidised and costs roughly $130–$260 per month privately. Wegovy and Mounjaro for weight loss are also available privately through telehealth providers at $200–$650/month depending on dose and service.