How the Macro-to-Calorie Conversion Works
The conversion is based on a set of standard energy values used in nutrition science:
- Protein: 4 kcal per gram
- Carbohydrates: 4 kcal per gram
- Fat: 9 kcal per gram
- Alcohol: 7 kcal per gram (relevant if tracking total intake)
To find your total calorie intake from macros, multiply each macro (in grams) by its calorie value and add the results together. For example, a day with 120 g protein, 150 g carbohydrate, and 60 g fat would give roughly (120 × 4) + (150 × 4) + (60 × 9) = 480 + 600 + 540 = 1,620 kcal.
Why This Matters on a GLP-1 Medication
People taking Mounjaro or Wegovy often eat significantly less than before. Tracking macros alongside calories helps flag situations where calories are very low but protein is also low — a pattern that can affect muscle retention and energy. Many people find that prioritising protein within a reduced-calorie intake is one of the most useful adjustments they can make, and the macro-to-calorie view makes that balance visible at a glance.
If you want to work backwards — starting from a calorie target and dividing it into macro goals — our calorie calculator for GLP-1 users covers that approach in detail. You can also use the maintenance calorie calculator to establish a sensible calorie baseline before setting your macro split.
General Educational Ranges (Not Personal Prescriptions)
General nutrition guidance commonly suggests that protein provides around 15–35% of total calories, carbohydrates 45–65%, and fat 20–35%, though these vary widely by individual goals and clinical needs. These are educational reference points — your own targets should reflect your personal circumstances and, where relevant, the guidance of 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.
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Track Your Macros and Calories Automatically in GLP Trackr
Manually totalling macros for every meal adds friction to an already demanding routine. GLP Trackr's AI food photo scan is designed to remove that friction — point your camera at a meal and the app estimates calories, protein, carbohydrates, and fat instantly, without typing a thing. It is particularly useful on low-appetite days when a small meal still needs to pull its nutritional weight.
Once logged, the app maps your macros against your daily targets and shows you how the numbers are stacking up across the day — so you can see at a glance whether you are hitting your protein goal or running low on calories before the day is done. The insights and analytics features can surface patterns over time, such as how protein intake on a given day correlates with energy or progress the following days.
If you are still working out what calorie and macro targets make sense for your journey, the Mounjaro calorie calculator gives a useful starting point, and the broader GLP-1 calorie calculator hub covers how to set targets that fit a GLP-1 lifestyle.
Any specific calorie or macro targets should be discussed with your prescriber or a registered dietitian — they can factor in your full health picture in a way a general calculator cannot.
Ready to stop doing the maths by hand? Download GLP Trackr on the App Store or Google Play and log your first meal with a photo — your 7-day free trial starts the moment you open the app.
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Frequently asked questions.
Multiply grams of protein by 4, grams of carbohydrate by 4, and grams of fat by 9, then add the three figures together. The result is your total calorie intake from those macros. Alcohol adds roughly 7 kcal per gram if relevant.
General nutrition guidance suggests protein at 15–35% of calories, carbohydrates at 45–65%, and fat at 20–35%, though individual needs vary. Many people on GLP-1 medicines find prioritising protein helpful. Your prescriber or a dietitian can advise on targets suited to you.
Calorie needs vary by individual and are best set with your prescriber or a registered dietitian. A maintenance calorie calculator can provide a general starting point, but any target should reflect your personal health circumstances and clinical guidance.
Yes. GLP Trackr's AI food photo scan estimates calories, protein, carbohydrates, and fat from a photo of your meal. You can also log food by barcode or search. The app tracks your daily totals against your set targets.
No. It is an educational tool to help you understand your numbers. For personalised calorie and macro targets — especially on a prescription medicine — speak with your prescriber or a registered dietitian who knows your full health history.