The Formula and How to Use It
The percentage of weight loss formula is straightforward:
- Step 1: Note your starting (original) weight.
- Step 2: Subtract your current weight from your starting weight to get the weight lost.
- Step 3: Divide the weight lost by your starting weight.
- Step 4: Multiply by 100 to get a percentage.
Written out: (Starting weight − Current weight) ÷ Starting weight × 100 = % weight lost
Using metric as an example — if your starting weight was 110 kg and you now weigh 99 kg, the calculation is: (110 − 99) ÷ 110 × 100 = 10%. In imperial, the same logic applies using pounds.
Why does this matter? A percentage accounts for your individual starting point in a way that a raw kilogram or pound figure does not. Someone who started at 80 kg losing 5 kg has lost more proportionally than someone who started at 140 kg losing the same amount. Percentage makes comparisons meaningful and personal.
It is worth understanding the factors that influence how weight loss happens over time, since progress is rarely perfectly linear. Plateaus, water retention, and muscle changes all affect the number on the scale, and percentage alone does not capture the full story of body composition. For a broader look at the wider benefits of weight loss beyond the percentage figure, it helps to track other markers alongside it. You may also find it useful to explore other ways to work out your weight loss percentage if you want to cross-check your calculations. For a fuller guide to tracking progress on a GLP-1 journey, visit the weight loss tracking overview.
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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Tracking Your Weight Loss Percentage with GLP Trackr
Doing this calculation manually every week is easy enough once, but over months of tracking it becomes repetitive and easy to let slip — particularly when appetite changes and side effects make week-to-week consistency harder. GLP Trackr's weight and body tracking feature does the arithmetic for you, turning each weigh-in into a running chart that shows not just the scale number but the trend over time.
The weekly transformation view in GLP Trackr lets you see your progress laid out visually — week by week — so a slow week looks less discouraging when set against a longer upward (or downward) trend. Alongside weight, you can log measurements like waist and hip circumference, which often change even when the scale stalls, giving a more complete view of what is actually shifting in your body.
The insights and analytics tools go a step further, surfacing correlations between your habits — sleep, protein intake, steps — and your weight trend, so you can understand what is genuinely moving your results rather than guessing. You can also generate a doctor report directly from the app, which brings a clean summary of your tracked progress to your next prescriber appointment.
If you are exploring how weight loss works on a GLP-1 medicine, having accurate records makes those conversations with your healthcare professional much more productive.
Progress on Mounjaro or Wegovy varies between individuals — results depend on many personal factors, and no tracking tool changes that. GLP Trackr helps you understand your own journey clearly; it is not a substitute for the guidance of your prescriber or doctor.
Give GLP Trackr a try — log your starting weight today, and let the app track your percentage progress automatically as your journey unfolds. Available free on the App Store and Google Play, with a 7-day trial to get started.
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.
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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.
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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.
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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.
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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.
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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.
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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
GLPIQ tracks where you are in your injection cycle and adjusts everything around it: lighter meals on nausea days, higher protein when appetite returns, and smarter targets as your medication level shifts.
Predicts Before You Feel It
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.
Finds Your Golden Dose
GLPIQ analyses every dose you've been on: weight loss rate, side effects, food noise, mood, protein adherence and tells you which dose gave you the best results. No other app does this.
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Frequently asked questions.
Subtract your current weight from your starting weight, divide the result by your starting weight, then multiply by 100. For example, losing 8 kg from a starting weight of 100 kg equals an 8% weight loss. The same formula works in pounds.
Percentage accounts for your individual starting point, making progress more meaningful to compare over time. Someone who started at a higher weight losing the same number of kilograms as someone lighter has actually lost less proportionally — percentage reflects that difference.
Results vary considerably between individuals and depend on many personal factors including starting weight, lifestyle, and how long someone has been taking the medicine. There is no guaranteed figure — your prescriber or doctor is the right person to discuss realistic expectations for your situation.
Yes. GLP Trackr logs each weigh-in and tracks your progress over time with charts and a weekly transformation view, so you can see your percentage change without doing the maths manually each week.
Plateaus are common and do not necessarily mean something is wrong. Tracking measurements, sleep, protein intake, and other habits alongside weight can help identify patterns. For concerns about your progress or medication, speak with your prescriber or doctor.