What determines how many calories you burn each day?
Your total daily calorie burn is made up of several components working together. The largest share — roughly 60–70% for most people — comes from your Basal Metabolic Rate (BMR): the energy your body uses just to keep you alive at rest (breathing, circulation, organ function). On top of that sits the energy used for digestion (the thermic effect of food) and, most variably, the calories you burn through movement and exercise.
The main factors that influence your daily burn
- Body size and composition: larger bodies and those with more muscle mass tend to burn more calories at rest.
- Age: BMR typically declines gradually with age, though staying active helps offset this.
- Biological sex: due to differences in average muscle mass and hormones, there are general differences in resting burn — though individual variation is large.
- Activity level: this is the most controllable variable. Steps, structured exercise, and even low-level movement (standing, fidgeting) all add up.
- GLP-1 effects: many people on Mounjaro or Wegovy eat significantly less and may also move differently as energy and appetite change. This can shift your energy balance in ways worth keeping an eye on.
Estimating your own number
Standard formulas such as the Mifflin-St Jeor equation use your weight, height, age, and an activity multiplier to estimate TDEE. These are useful starting points, not precise measurements — real-world burn varies day to day. Our calorie calculator hub brings these tools together in one place.
If you want to understand the other side of the equation, it is worth exploring how many calories you are currently consuming and how many calories you actually need each day — both of which interact directly with your burn figure.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Knowing your estimated burn is only useful if you can compare it against what you are actually eating. GLP Trackr's AI food photo scan lets you point your camera at a meal and get an instant calorie and protein breakdown — no manual entries needed, which matters when appetite is low and logging feels like effort.
Once your daily calorie target is set in the app, GLP Trackr tracks your intake against it throughout the day, so you can see at a glance whether you are broadly on track. The insights dashboard then surfaces patterns over time — for example, whether the days you hit your step count or protein goal tend to correlate with better progress on the scale.
You can also log how many calories you eat day to day to build a clearer picture of your real-world habits alongside your estimated burn. These two numbers together — what you burn and what you consume — are the foundation of understanding your own journey.
General calorie ranges are educational starting points. For personal guidance on the right targets for your situation, always follow the advice of your prescriber or doctor — they have the full picture of your health.
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Frequently asked questions.
Without deliberate exercise, most adults burn between 1,400 and 2,200 calories a day through their resting metabolic rate and normal daily movement. The exact figure depends on your body size, age, and general activity level — even low-level movement adds up meaningfully.
Total daily energy expenditure is typically estimated using a formula (such as Mifflin-St Jeor) that factors in your weight, height, age, and activity level. These estimates are useful reference points rather than precise measurements, and your actual burn varies from day to day.
The medicines themselves are not directly shown to raise resting calorie burn. However, changes in appetite, food intake, and activity levels that many people experience on GLP-1 medicines can all influence your overall energy balance. Speak with your prescriber for personalised guidance.
GLP Trackr lets you set a daily calorie target and log meals via AI photo scan, barcode, or search. The insights dashboard shows how your intake compares to your target over time, helping you spot patterns across your whole GLP-1 journey.
The right calorie intake relative to your burn depends on your individual goals and health circumstances. General guidance suggests a modest deficit for gradual weight loss, but your prescriber or doctor is best placed to advise on the right approach for you specifically.