The Maths Behind Macros and Calories
The calculation itself is straightforward. Once you know how many grams of protein, carbohydrate, and fat a food or meal contains, you can work out its calorie content using these values:
- Protein: grams × 4 = calories
- Carbohydrate: grams × 4 = calories
- Fat: grams × 9 = calories
Add the three totals together and you have the calorie count for that food. For example, if a meal contains 30 g of protein, 40 g of carbohydrate, and 15 g of fat, the calculation looks like this: (30 × 4) + (40 × 4) + (15 × 9) = 120 + 160 + 135 = 415 calories.
Why the Macro Split Matters on a GLP-1 Journey
On Mounjaro or Wegovy, many people find their overall appetite decreases, which means the quality and composition of what they eat becomes more important. A meal that looks modest in calories but is low in protein may not support muscle maintenance as well as one with a higher protein share. Seeing the macro breakdown — not just the calorie total — helps you make informed choices about what to prioritise.
If you want to work out your overall daily calorie needs first, the GLP Trackr calorie calculator is a good starting point. You can also explore a dedicated macros calculator to see how your targets break down by gram, and use the calorie calculation guide for a broader look at how calories are counted across different foods.
General Educational Ranges
Many nutrition guidelines suggest that a balanced diet draws roughly 10–35% of calories from protein, 20–35% from fat, and 45–65% from carbohydrates — though these are general educational ranges, not personalised targets. What is right for you depends on your individual circumstances and is best discussed with your prescriber or a registered dietitian.
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.
AI Meal Tracking. Built for GLP 1 Appetites.
Point your camera at any meal and let our AI do the rest. Breakfast, doses, weight, mood all tracked in seconds.
Track Your Macros and Calories Automatically in GLP Trackr
Working out macros by hand is useful to understand the principle, but doing it for every meal quickly becomes tedious — especially when appetite is unpredictable. GLP Trackr's AI food photo scan is the fastest way to log a meal: point your camera at your plate and the app estimates calories, protein, carbohydrates, and fat in seconds, without manual entry.
Once you have set a protein or calorie target in the app, every logged meal is automatically counted toward that goal, so you can see at a glance whether you are hitting your protein for the day or where your calories are coming from. The best apps for calculating calories make this kind of tracking effortless — and GLP Trackr pairs food logging with the rest of your GLP-1 journey, including weight trends and daily check-ins, so everything is in one place.
You can also use the barcode scanner for packaged foods or search the food library manually — whichever fits your routine.
GLP Trackr is available free on the App Store and Google Play. Give it a try with a 7-day free trial and see how much easier macro tracking becomes when the maths is done for you.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
Everything your GLP-1 journey needs. Free to try for 7 days.
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.
You're Not on This Journey Alone.
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.
Download on the App Store Download on the Google Play
Founding Member Offer
One plan. Everything included. No hidden extras.
Founding Member
Exclusive Offer
Join the first 1,000 membersand lock in our lowest ever price
Offer expires in:
786 of 1000 founding spots remaining
50% OFF
Lifetime Price Lock
Never pay full price • Forever
🔒 No credit card required • Cancel anytime
Premium
Ad-free- Track weight, meals, water, exercise, & sleep
- Log doses, injection sites, & side effects
- 60-second daily morning check-in
- AI meal scanning & barcode scanning
- Personalised AI meal plans & recipes
- Golden Dose Finder AI
- Medication Clock — real-time level tracking
- Daily Brief and predictive side effects
- Full insights & weekly transformation cards
- Unlimited progress photos
- Doctor PDF export & body measurements
- Community Access—Connect with GLP-1 users
Powered by
🔒 No credit card required • Cancel anytime
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.
Download glptrackr today.
Available on iOS and Android. 7-day free trial, no credit card needed.
Frequently asked questions.
Multiply grams of protein by 4, carbohydrates by 4, and fat by 9, then add the three totals together. For example, 30 g protein + 40 g carbs + 15 g fat equals 415 calories. This works for any individual food or a whole meal.
When appetite is reduced, it becomes easier to under-eat protein without realising it. Tracking macros alongside calories helps you see whether your meals are protein-rich enough to support muscle maintenance alongside weight loss — something many people on GLP-1 medicines find valuable.
Protein provides approximately 4 calories per gram, the same as carbohydrates. Fat provides approximately 9 calories per gram — more than double. These values are fixed and apply regardless of the food source.
GLP Trackr's AI food photo scan estimates calories, protein, carbohydrates, and fat from a photo of your meal. It also includes a barcode scanner and food search. The app is free to try for 7 days on iOS and Android.
There is no single universal target — general guidelines suggest roughly 10–35% of calories from protein as a broad range, but the right balance for you depends on your individual circumstances. Discuss personalised macro targets with your prescriber or a registered dietitian.