What 'calculating weight loss' actually means — and why it matters
Weight loss calculation is straightforward in principle: subtract your current weight from your starting weight to find total loss. But that single number rarely captures the full picture of a GLP-1 journey.
Total weight lost
This is the most familiar measure — the difference between where you started and where you are now. Tracking it over time lets you see how far you have come, even when daily fluctuations make it hard to tell.
Rate of change (per week or month)
Dividing your total loss by the number of weeks or months elapsed gives an average rate. Progress on GLP-1 medicines is rarely linear — there are weeks of faster movement, weeks of apparent stillness, and natural plateaus. Knowing your average rate helps you interpret a quiet week without alarm.
Percentage of body weight lost
Dividing your total loss by your starting weight and multiplying by 100 gives a percentage. Many people find this figure more meaningful than kilograms or pounds alone, because it accounts for individual starting points. For example, 5 kg lost from a starting weight of 80 kg represents 6.25% of body weight.
Why the scale alone is not the whole story
Body composition, measurements, energy levels, and how clothes fit all shift alongside the number on the scale. Many people on Mounjaro or Wegovy notice changes in how they feel and in their measurements weeks before the scale reflects them. Capturing multiple data points gives a much more honest view of your journey.
For practical guidance on working out your daily calorie needs alongside weight tracking, see our page on calculating calories on a GLP-1 journey and our caloric intake guidance. You can also explore a more detailed breakdown in our weight loss calculation guide.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
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Track your weight loss automatically with GLP Trackr
Doing the maths manually works once — but doing it consistently, week after week, is where most people lose momentum. GLP Trackr's weight and body tracking feature does the calculation for you, turning every weigh-in into a running record of your progress.
Log your weight each morning during the daily check-in and the app builds a visual chart showing total loss, weekly trends, and your trajectory over time. You will see at a glance whether the current week is a slower one or whether you are tracking ahead of your own average — without needing a spreadsheet.
Beyond the scale, you can log measurements (waist, hips, arms) so that changes in body composition show up even when weight movement pauses. The insights feature surfaces correlations in your own data — for example, how protein intake or sleep quality relates to your week-on-week results — turning your log into something genuinely useful rather than just a record.
All of this feeds into the app's broader tools for the journey. Our GLP-1 calorie calculator hub brings together the key numbers that sit alongside weight tracking, from daily calorie targets to protein goals.
GLP Trackr is a tracking and journaling tool — it supports your journey and helps you have more informed conversations with your prescriber, but it is not a substitute for their guidance. If you have questions about your progress or whether your results are on track, your prescriber or doctor is the right person to ask.
Ready to see your progress come together in one place? Download GLP Trackr on the App Store or Google Play and start a free 7-day trial — your weight, measurements, and trends, all in one clear view.
What does glptrackr include?
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Morning Check-In
Start every day with a 60-second wellness check-in. Log how you're feeling, track nausea, appetite, energy, and mood — giving you and your care team a complete picture of how your medication is working.
Injection Tracking
Log every dose with a single tap. Track your dose history, phase in your cycle, estimated medication levels, and upcoming injection dates — with reminders so you never miss a scheduled shot.
Hydration Reminders
Staying hydrated is especially important on GLP-1 medications. Set daily water targets, log intake throughout the day, and receive smart nudges when you're falling behind your goal.
Smart Meal Planning
Personalized meal plans built around your current dose phase and side effects. Every meal is GLP-1 optimized — high in protein, gentle on the stomach, and scaled to your reduced appetite.
Recipe Library
Browse 50+ high-protein, GLP-1-friendly recipes filtered by meal type, prep time, and dietary needs. Every recipe includes full nutrition info, step-by-step instructions, and tips for eating with side effects.
Progress Analytics
Beautiful, easy-to-read charts show your weight loss trajectory, weekly nutrition trends, medication responses, and wellbeing scores over time — turning raw data into genuine insights.
AI Meal Scanning
Snap a photo of any meal and get a full nutrition breakdown in seconds — calories, protein, carbs, fat, and fibre. No searching. No manual logging. Just point, snap, and track.
Exercise & Steps
Log walks, workouts, and movement with activity targets that flex with your energy levels. On lower-energy dose days, gentler targets keep you moving without burning out.
Community Support
Connect with thousands of others navigating the same medication journey. Share milestones, ask questions, find accountability partners, and get support from people who truly understand.
Never Forget a Dose Again.
Log your Mounjaro or Wegovy injection in seconds. Track your pen, your dose level, and your injection site — so you always know exactly where you are in your treatment.
Watch Your Body Transform, Week by Week.
Log your weight, measurements, and how you're feeling after each dose. GLPTrackr turns your data into clear, motivating charts that show you how far you've really come.
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Connect with thousands of real GLP-1 users sharing their wins, side effect tips, and meal ideas. Get the support of people who truly get it — because they're living it too.
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The Most Advanced GLP-1 Brain Ever Built.
The first AI built exclusively for GLP-1 weight loss. Every insight, every meal plan, every prediction trained on one thing only: helping you get the most out of your medication.
Knows Your Cycle
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GLPIQ learns your personal side effect patterns over time. After a few cycles, it starts warning you the morning before a rough day — and adjusts your meal plan automatically.
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Frequently asked questions.
Divide your total weight lost by your starting weight, then multiply by 100. For example, losing 6 kg from a starting weight of 90 kg equals 6.7% of body weight lost. This figure can be more meaningful than an absolute number because it reflects individual starting points.
Many people find that weighing at the same time each day — typically in the morning — and looking at weekly or monthly trends gives a more reliable picture than any single reading. Daily fluctuations are normal and do not reflect true fat loss or gain.
Plateaus and slower weeks are a common part of the journey on GLP-1 medicines — progress is rarely linear. Factors like water retention, changes in activity, or natural body adaptation can all affect the scale. Tracking trends over several weeks gives a much more accurate view than day-to-day readings.
Yes. When you log your weight in the app, GLP Trackr tracks your total loss, charts your trend over time, and surfaces weekly progress — so the calculation happens automatically. You can also log body measurements to capture changes beyond the scale.
The scale is one useful measure, but not the only one. Many people also track body measurements, energy levels, and how clothes fit. Logging multiple data points — as GLP Trackr allows — tends to give a more complete and motivating picture of how the journey is going.