How to Calculate Your Weight Loss Percentage
The formula is straightforward and works with any unit of measurement:
- Weight lost = Starting weight minus current weight
- Percentage lost = (Weight lost ÷ Starting weight) × 100
For example: starting weight 95 kg, current weight 82 kg. Weight lost = 13 kg. Percentage = (13 ÷ 95) × 100 = 13.7%. The same formula works in pounds — the unit does not matter as long as you use the same one throughout.
Why percentage matters more than kilograms alone
Two people can both lose 10 kg but have very different journeys — someone starting at 80 kg has lost 12.5%, while someone starting at 130 kg has lost around 7.7%. Percentage loss puts results in context and makes week-on-week comparisons more meaningful. Many people on GLP-1 medicines like Mounjaro (tirzepatide) or Wegovy (semaglutide) find that tracking percentage, rather than just the number on the scale, keeps motivation steady through slower weeks.
What affects your percentage over time
Progress is rarely linear. Factors including hydration, sleep, muscle changes, and where you are in your dose titration can all influence the number week to week. Understanding this context is part of tracking your overall weight loss journey effectively. If you are also thinking about how your nutrition fits in, exploring how to calculate your macros on a GLP-1 plan can help you see the full picture alongside your percentage figures. For a broader look at body composition numbers, the guide on calculating percentage loss by weight covers additional approaches worth knowing.
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 Percentage Automatically with GLP Trackr
Doing the calculation manually each week is fine, but GLP Trackr removes the maths entirely. The app's weight and body tracking feature logs every weigh-in, computes your percentage lost from your starting weight automatically, and displays your trend as a visual chart — so you can see momentum building even during weeks when the number barely moves.
The weekly transformation view goes further, combining your weight percentage with measurements, mood, energy, and other check-in data to show what is actually shifting over time. This kind of layered view is particularly useful on a GLP-1 journey, where the scale does not always capture muscle retention, changes in how clothes fit, or improvements in energy and sleep.
The insights and analytics tools also include a plateau forecast and correlation explorer, so you can spot whether factors like protein intake or sleep quality are influencing your rate of progress — useful context to bring to your next prescriber appointment alongside the app's doctor report. GLP Trackr logs everything in one place, from your dose history to your weekly percentage, making those conversations more informed.
For a wider view of the numbers that support your journey, the calorie and nutrition calculator hub brings together the tools most relevant to GLP-1 tracking.
GLP Trackr is an informational tracking tool, not a substitute for your prescriber or doctor. If you have questions about your progress or what your results mean for your health, always discuss them with your healthcare professional.
Ready to stop doing the maths yourself? Download GLP Trackr on the App Store or Google Play and start your free 7-day trial — your weight loss percentage is calculated for you from day one.
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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.
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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.
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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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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.
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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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Frequently asked questions.
Divide the amount of weight you have lost by your starting weight, then multiply by 100. For example, losing 8 kg from a starting weight of 90 kg gives a weight loss percentage of 8.9%. The formula works with any unit as long as you are consistent.
Progress varies considerably between individuals and depends on factors such as starting weight, dose, diet, and activity. There is no universal figure that applies to everyone. Your prescriber or doctor is the right person to discuss what realistic progress looks like for your specific situation.
For many people, percentage is more meaningful because it accounts for starting weight. Someone losing 10 kg from 80 kg has lost a greater proportion of their body weight than someone losing 10 kg from 140 kg. Percentage puts individual results in context.
GLP Trackr uses your logged starting weight and each subsequent weigh-in to calculate and display your percentage loss automatically, shown as a chart over time. No manual calculation is needed — the app updates the figure every time you log a new weight.
Plateaus are common on any weight loss journey and can reflect fluid shifts, muscle changes, dietary patterns, or where you are in your dose schedule. Tracking consistently over time helps distinguish a genuine stall from normal week-to-week variation. Discuss persistent plateaus with your healthcare professional.