GLP-1 Weight Loss Projection Calculator

See projected weight loss timelines for Semaglutide, Tirzepatide, and Retatrutide based on published clinical trial data including dose escalation schedules.

Educational tool — not medical advice. This calculator provides estimates based on population averages and published trial data. Outputs are not clinical recommendations and do not replace evaluation by a qualified prescriber. Do not start, stop, or change a peptide therapy based on the result of this tool.

Current Weight

Goal Weight

Height

Age

Sex

Medication

Semaglutide (Wegovy)

~15% body weight loss over 68 weeks (STEP-1 trial)

Tirzepatide (Zepbound)

~22.5% body weight loss over 72 weeks (SURMOUNT-1 trial)

Retatrutide

~28.7% body weight loss over 48 weeks (Phase 3 trial)

Medical Disclaimer

This tool is for informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment recommendations. Results are estimates based on published clinical trial data and population averages — individual results may vary significantly.

Always consult a qualified healthcare provider before starting, stopping, or modifying any peptide therapy or medication. Do not make medical decisions based solely on this tool.

Embed This Tool on Your Website

Add this free tool to your website. Copy the code below and paste it into your HTML. Includes a backlink to PeptideProbe.

Width

Height (px)

<iframe src="https://peptideprobe.com/tools/embed/weight-loss-calculator" width="100%" height="900px" style="border:none;border-radius:12px;max-width:100%;" title="GLP-1 Weight Loss Projection Calculator — PeptideProbe" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:12px;text-align:center;margin-top:8px;color:#64748b;">Powered by <a href="https://peptideprobe.com/tools/weight-loss-calculator" target="_blank" rel="noopener" style="color:#0d9488;text-decoration:underline;">PeptideProbe</a> — Free Peptide Therapy Tools</p>