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GLP-1 Weight Loss Tracker Calculator

Free, highly accurate online calculation tool. Process your calculations securely in real time with comprehensive formula transparency, unit flexibility, and instant results.

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GLP-1 Weight Loss & Medication Timeline Predictor

Model projected weight loss trajectories, weekly titration schedules, and lean mass preservation under GLP-1 receptor agonists (Semaglutide/Wegovy/Ozempic) and dual GIP/GLP-1 agonists (Tirzepatide/Zepbound/Mounjaro).

# Calculation Pipeline (Chain of Thought)

  • Step 1 (Clinical Trial Trajectory Model): Semaglutide Benchmark: ~15% loss at Week 68; Tirzepatide Benchmark: ~21% loss at Week 72.
  • Step 2 (Monthly Rate Estimation): Titration Phase (Weeks 1-8): 0.5-1.0% body weight/week; Steady State: 1.0-2.0 lbs/week.
  • Step 3 (Lean Mass Preservation Target): Minimum Protein Requirement = 1.2 to 1.6 g/kg (0.6-0.8 g/lb) of total body weight.
  • Step 4 (Hydration & Electrolyte Adjustment): Target ≥ 3.0 Liters water/day + 500mg sodium/potassium to counter reduced thirst sensation.
Decision Rule: Clinical Sarcopenia Warning: Combine GLP-1 therapy with 2–4 days/week of progressive resistance training to prevent severe skeletal muscle wasting.
+-------------------------------------------------------------------+ | GLP-1 WEIGHT LOSS TRAJECTORY & TIMELINE | +-------------------------------------------------------------------+ [ Starting Weight ] + [ Medication: Semaglutide vs Tirzepatide ] | v [ 4-Week Dose Titration Ramp (0.25mg -> 0.5mg -> 1.0mg -> 1.7mg -> 2.4mg) ] | v [ Clinical Weight Loss Trajectory Curves (STEP 1 & SURMOUNT-1) ] • Week 12: ~6% to 8% body weight reduction • Week 24: ~10% to 14% body weight reduction • Week 48: ~13% to 18% body weight reduction • Week 68+: ~15% (Semaglutide) to ~21% (Tirzepatide) plateau | v [ BODY COMPOSITION SAFEGUARD ] • Protein Floor: 1.2 - 1.6 g/kg • Resistance Training: 3x/week Progressive Overload • Sarcopenia Defense: Preserve >70% Lean Mass

Frequently Asked Questions

What is the average total weight loss expected on Semaglutide vs Tirzepatide?

In benchmark clinical trials (STEP 1 and SURMOUNT-1), Semaglutide 2.4mg achieved an average of ~14.9% total body weight loss at 68 weeks, while Tirzepatide 15mg achieved ~20.9% total body weight loss at 72 weeks.

Why is dose titration mandatory every 4 weeks?

Gradual monthly dose escalation allows the gastrointestinal tract and central nervous system to adapt to delayed gastric emptying, significantly reducing nausea, vomiting, and reflux.

How much lean muscle mass is lost on GLP-1 medications?

Without targeted resistance training and high protein intake, 25% to 40% of total weight lost on GLP-1 agonists can come from skeletal muscle mass and lean body tissue.

What happens to body weight if GLP-1 medications are discontinued?

Clinical extension trials (STEP 1 trial extension) indicate patients regain approximately two-thirds of their lost weight within one year of stopping medication if comprehensive lifestyle changes are not maintained.

GLP-1 Clinical Protocols & Checklists

  • Protein-First Meal Prioritization: Because GLP-1 medications create early satiety, always consume your high-protein portions first before vegetables or carbohydrates to ensure daily amino acid goals are met.
  • Gastrointestinal Motility Management: Combat delayed gastric emptying side effects by eating smaller meals, avoiding high-fat greasy foods, staying upright 2 hours post-meal, and taking soluble fiber.
  • Hydration and Electrolyte Scheduling: GLP-1 medications suppress central thirst cues. Drink 16 oz of electrolyte-enhanced water immediately upon waking and carry a measured water bottle daily.
  • Biannual DEXA Body Composition Scans: Schedule a DEXA scan before starting medication and repeat at 6 months to ensure weight loss is derived from adipose tissue rather than skeletal muscle.

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