# GLP-1 Weight Loss Calculator

> A free, clinical-trial-backed calculator that projects personalized week-by-week weight loss for GLP-1 medications including Ozempic, Wegovy, Mounjaro, Zepbound, semaglutide, and tirzepatide.

## About This Tool

The GLP-1 Weight Loss Calculator at glp1weightlosscalculator.com helps users estimate their weight loss journey on GLP-1 receptor agonist medications. It uses data from landmark clinical trials (STEP-1 for semaglutide, SURMOUNT-1 for tirzepatide) to generate personalized projections based on current weight, height, age, gender, and target weight.

## Supported Medications

- **Ozempic** (semaglutide) — GLP-1 agonist, ~12% average weight loss, max dose 2.0 mg/week
- **Wegovy** (semaglutide) — GLP-1 agonist, ~15% average weight loss, max dose 2.4 mg/week
- **Mounjaro** (tirzepatide) — Dual GIP/GLP-1 agonist, ~22% average weight loss, max dose 15 mg/week
- **Zepbound** (tirzepatide) — Dual GIP/GLP-1 agonist, ~20% average weight loss, max dose 15 mg/week
- **Generic Semaglutide** — GLP-1 agonist, ~15% average weight loss, max dose 2.4 mg/week
- **Generic Tirzepatide** — Dual GIP/GLP-1 agonist, ~22% average weight loss, max dose 15 mg/week
- **Retatrutide** (investigational) — Triple GIP/GLP-1/Glucagon agonist, ~24% average weight loss (phase 2), max dose 12 mg/week

## Key Clinical References

1. Wilding JPH et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity. N Engl J Med. 2021;384(11):989-1002. PMID: 33567185
2. Jastreboff AM et al. Tirzepatide Once Weekly for the Treatment of Obesity. N Engl J Med. 2022;387(3):205-216. PMID: 35658024
3. Wilding JPH et al. Weight regain after withdrawal of semaglutide: STEP 1 extension. Diabetes Obes Metab. 2022;24(8):1553-1564. PMID: 35441470
4. van Sloten TT et al. Projected life-year gains with semaglutide (SELECT trial). Endocr Connect. 2026. PMID: 41800807
5. Jastreboff AM et al. Triple-Hormone-Receptor Agonist Retatrutide for Obesity — A Phase 2 Trial. N Engl J Med. 2023;389(6):514-526. PMID: 37366315

## How It Works

1. User selects a GLP-1 medication
2. User enters current weight, height, age, gender, and target weight
3. Calculator generates a week-by-week weight loss projection chart
4. Results include personalized dosing timeline, calorie/protein recommendations, and estimated weeks to goal

## Frequently Asked Questions

- How much weight can you lose on Ozempic? Average 14.9% body weight over 68 weeks (STEP-1 trial)
- How much weight can you lose on Mounjaro? Average 22.5% body weight over 72 weeks (SURMOUNT-1 trial)
- What is Retatrutide? An investigational triple GIP/GLP-1/Glucagon agonist that achieved 24.2% weight loss in a phase 2 trial — the most effective weight loss medication studied to date
- What is the difference between semaglutide and tirzepatide? Semaglutide is a GLP-1 agonist; tirzepatide is a dual GIP/GLP-1 agonist with higher average weight loss
- Are GLP-1 medications safe? FDA-approved for weight management; common side effects include nausea that improves over time; SELECT trial showed cardiovascular benefits
- How long to see results? Noticeable weight loss within 4 weeks; significant results after 3-6 months at higher doses
- What happens if you stop? STEP-1 extension showed ~2/3 of lost weight regained within 1 year of stopping

## Full Content

For the complete detailed version of this site's content, see: https://www.glp1weightlosscalculator.com/llms-full.txt

## Contact

Website: https://www.glp1weightlosscalculator.com