A GLP-1 weight loss calculator estimates your projected weight loss timeline based on clinical trial data for medications like Ozempic, Wegovy, Mounjaro, and Zepbound. Weight loss on GLP-1 receptor agonists follows a logarithmic curve, with the fastest loss in the first six months and a plateau around 12-15 months. Enter your details below to see projected results.
Medical Disclaimer
Results vary. These are clinical trial averages — individual results depend on diet, exercise, and adherence. Consult your healthcare provider for personalized advice.
Your Details
Leave blank to see full projection without a target
Target Weight Estimate
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Projected Weight Over Time
Month-by-Month Projection
| Month | Date | Weight | Lost | % Lost | BMI |
|---|
Results vary. Clinical trial averages — individual results depend on diet, exercise, and adherence. This tool is for educational purposes only. Consult your healthcare provider for personalized medical advice.
Clinical Trial Weight Loss Data
Average weight loss as a percentage of body weight from pivotal clinical trials.
| Medication | Active Ingredient | Avg. Loss | Trial Duration |
|---|---|---|---|
| Ozempic (2mg) | Semaglutide | 10-14% | 68 weeks |
| Wegovy (2.4mg) | Semaglutide | 15-17% | 68 weeks |
| Mounjaro (15mg) | Tirzepatide | 20-26% | 72 weeks |
| Zepbound (15mg) | Tirzepatide | 20-26% | 72 weeks |
How to Use the GLP-1 Weight Loss Calculator
GLP-1 receptor agonist medications have shown significant weight loss results in clinical trials, but understanding your personal projected timeline can be challenging. This GLP-1 weight loss calculator uses clinical trial averages and a logarithmic weight loss model to project your results month by month.
Step 1: Enter Your Current Weight
Enter your current body weight in either pounds or kilograms. The calculator uses this as the starting point for all projections. Toggle between lbs and kg using the dropdown — all outputs will display in your chosen unit.
Step 2: Enter Your Height
Height is used to calculate your BMI (Body Mass Index) progression from start to projected end. You can enter height in feet and inches or centimeters. The calculator shows both your starting and projected final BMI so you can see the clinical significance of the weight change.
Step 3: Select Your Medication
Choose from four FDA-approved GLP-1 medications. Each has different average weight loss results from clinical trials: Ozempic averages 10-14%, Wegovy 15-17%, and Mounjaro and Zepbound 20-26% of body weight. The calculator uses the midpoint of each range for projections.
Step 4: Set a Target Weight (Optional)
If you have a specific goal weight, enter it here. The calculator will estimate approximately when you might reach that target based on the projected weight loss timeline. If the target is beyond the medication's average effect, the calculator will indicate that.
Understanding the Results
Weight loss on GLP-1 medications follows a logarithmic curve — you lose weight fastest in the first few months, with the rate gradually slowing until reaching a plateau around 12-15 months. The chart visualizes this curve, and the table provides monthly snapshots showing projected weight, cumulative loss, percentage lost, and BMI at each point. Remember that these are clinical trial averages and your individual results may differ significantly.
FAQ
Is this GLP-1 weight loss calculator free?
Yes, this calculator is completely free with no limits or signup required. All calculations run locally in your browser. You can estimate weight loss projections as many times as you need.
Is my data safe and private?
Yes, all calculations run entirely in your browser using client-side JavaScript. No weight, height, or personal health data is sent to any server or stored anywhere. Your information stays on your device only.
How accurate are the weight loss projections?
The projections are based on average results from large clinical trials. Individual results vary significantly based on diet, exercise, medication adherence, genetics, and starting weight. Use these estimates as a general guide, not a guarantee.
How much weight can I lose on Ozempic?
Clinical trials show average weight loss of 10-14% of body weight over 68 weeks on Ozempic 2mg. For a 200-pound person, this translates to roughly 20-28 pounds. Individual results depend on diet, exercise, and adherence to the medication.
Which GLP-1 medication causes the most weight loss?
Mounjaro and Zepbound (both tirzepatide) show the highest average weight loss in clinical trials at 20-26% of body weight over 72 weeks. Wegovy (semaglutide) shows 15-17%, and Ozempic shows 10-14%. Your doctor will recommend the best option for your situation.
When does weight loss plateau on GLP-1 medications?
Weight loss typically follows a logarithmic curve — most loss occurs in the first 6 months, with the rate slowing significantly around 12-15 months. After this plateau, weight generally stabilizes at the new lower level as long as medication continues.
Is this a substitute for medical advice?
No. This calculator provides estimates based on clinical trial averages for educational purposes only. Your actual results will vary. Always consult your healthcare provider for personalized medical advice about GLP-1 medications and weight management.