Medication
Semaglutide usually reflects steadier progress. Tirzepatide often projects a faster pace. Retatrutide is investigational and research-only.
Medication-Specific Weight Loss Calculator
See a more realistic GLP-1 timeline.
This version changes the projection based on semaglutide, tirzepatide, or investigational retatrutide. It uses a stronger early phase and a slower later phase so the estimate does not stay flat all year.
Calculator disclaimer: This tool provides educational estimates only and is not medical advice, diagnosis, or treatment. Individual outcomes vary.
Different pacing for semaglutide vs tirzepatide vs retatrutide.
12-month ranges, BMI shift, milestone dates, and pace profile.
Retatrutide is marked investigational inside the page.
Enter your information
Choose the medication first. That selection changes the engine behind the projections.
How to Use This Calculator
Quick guidance for choosing your inputs and interpreting your estimate with realistic expectations.
Activity Level
This helps estimate how efficiently your body uses energy. Higher activity can slightly improve projected pace, and even light activity matters.
Protein Goal
Protein helps protect muscle during weight loss. Better intake can support body composition and preserve lean mass while fat is reduced.
Water Goal
Hydration supports energy, digestion, and medication tolerance. Water intake can influence how people feel during a GLP-1 program.
Weeks on Medication
Early weeks can be slower. Progress often changes as dosing increases over time, so this input helps make your estimate more realistic.
How to Read Results
Results are estimates, not guarantees. You will see a range instead of a fixed promise, and milestones help map the likely path forward.
These inputs help create a more useful estimate, but real results depend on consistency, medication plan, and provider guidance.
Your projected timeline
Pounds to lose
0 lbs
Distance between your current weight and goal weight.
Goal window
0 to 0 mo
Estimated range using the selected medication profile.
Body weight loss
0%
Share of current body weight needed to reach goal.
BMI change
0 to 0
Current BMI compared with projected BMI at goal weight.
Pace profile
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1 month
0 to 0 lbs
Early treatment phase estimate.
3 months
0 to 0 lbs
Often where appetite change and adherence patterns show clearly.
6 months
0 to 0 lbs
Mid-course estimate with slowdown applied.
12 months
0 to 0 lbs
Capped to stay within a more realistic annual band.
Medication profile
Milestone value
Coach note
First 5 lbs
-
Projected with the fast edge of your current medication profile.
First 10 lbs
-
A useful early benchmark for motivation and follow-through.
10% body weight lost
-
A strong clinical milestone in obesity treatment discussions.
Goal date window
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This calculator gives an estimate only. It does not predict your actual result. Retatrutide is investigational and should not be shown as an approved treatment option. Final treatment choice, dosing, risk review, and follow-up belong with a licensed clinician.