How Many Calories Will I Burn on a GLP-1 Medicine?

Your total daily calorie burn is made up of three main components, and understanding each one helps you make sense of the numbers.

Basal Metabolic Rate (BMR)

BMR is the energy your body uses just to keep you alive — breathing, circulation, cell repair — at complete rest. It typically accounts for the largest share of your daily burn, often around 60–70% of total expenditure, though this varies considerably between individuals. Commonly used estimation formulas (such as Mifflin-St Jeor) factor in your weight, height, age, and biological sex.

Activity and Movement

On top of BMR, any movement you do — formal exercise, walking, even fidgeting — adds to your daily burn. This is often called your activity factor or TDEE (Total Daily Energy Expenditure) when combined with BMR. People on GLP-1 medicines sometimes find their energy levels fluctuate, particularly early on, which can affect how much they move day to day.

The Thermic Effect of Food

Digesting and processing food itself burns a small number of calories — typically around 10% of total intake. Protein has a higher thermic effect than fat or carbohydrate, which is one reason prioritising protein is so commonly discussed on a GLP-1 journey. For more on hitting your daily protein needs, see how to think about your daily calorie and nutrient needs and how many calories to eat each day on a GLP-1 medicine.

Why This Matters on a GLP-1 Journey

Reduced appetite is commonly reported by people taking medicines like Mounjaro or Wegovy. Eating significantly less than your burn rate can accelerate progress, but eating too little — especially too little protein — risks losing muscle alongside fat. Knowing roughly how many calories you burn gives you a reference point, not a prescription. For a full picture of your calorie needs, visit our GLP-1 calorie calculator hub or explore understanding calories on a GLP-1 plan.

Knowing your estimated burn is most useful when you can compare it, day by day, against what you are actually eating. That is where GLP Trackr's targets and food logging come together.

Set your daily calorie and protein targets inside the app, then log meals effortlessly using the AI photo scan — point your camera at a plate and get an instant nutrition breakdown without manual entry. When appetite is low and portions are small, this removes the friction of tracking almost entirely.

The app's insights and analytics layer connects your food data with your weight log and daily check-ins, so you can start to see how your actual intake compares to your estimated burn over time — and how factors like sleep and steps relate to your results. Your daily step count feeds into the activity picture, helping you build a more accurate view of your energy balance week by week.

General educational ranges are useful starting points, but the right calorie target for you personally depends on your own health history, current weight, and goals. Any specific targets should be agreed with your prescriber or doctor — they know your full picture in a way a calculator cannot.

Ready to put the numbers to work? Download GLP Trackr on the App Store or Google Play and use your first 7 days completely free to set your targets, log meals with a snap of your camera, and watch your energy balance take shape.