What Determines How Many Calories Your Body Burns?
Your daily calorie burn has three main components, each contributing a different share of the total.
Basal Metabolic Rate (BMR)
BMR is the number of calories your body needs just to stay alive — breathing, circulation, cell repair — with no movement at all. It typically accounts for roughly 60–70% of total daily calorie burn for most people, though this varies individually. Larger bodies and those with more muscle mass tend to have a higher BMR.
Physical Activity
Movement — whether structured exercise or simply walking to work — adds significantly to your total burn. This is the component you have the most direct control over day to day. Steps logged over time show a clear picture of how activity levels shift, which is worth watching when appetite changes on a GLP-1 medicine can also affect energy.
The Thermic Effect of Food
Digesting food itself requires energy — roughly 5–10% of total daily calories for most eating patterns. Protein has a higher thermic effect than carbohydrates or fat, one reason many people on GLP-1 medicines are encouraged to prioritise protein-rich foods.
How the Numbers Are Estimated
Calorie-burn estimates are usually calculated using a formula (such as Mifflin-St Jeor or Harris-Benedict) that takes your height, weight, age, and an activity multiplier into account. These produce an estimate — individual metabolism varies, and no formula is perfectly precise for every person. Use the figure as a useful starting point, not a hard biological truth.
If you want to explore your own numbers, the GLP Trackr calorie calculator hub brings these calculations together in one place. You may also find it helpful to read about how calories work in practice when managing your intake on a GLP-1 journey.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Track Your Calorie Burn Automatically with GLP Trackr
Knowing your estimated calorie burn is only useful if you can compare it consistently against what you are actually eating and doing — and that comparison is where GLP Trackr comes in.
The app lets you set a personalised calorie target based on your goals, then tracks your intake effortlessly using AI-powered photo scanning: point your camera at a meal and get an instant nutrition breakdown without manual entry. On days when appetite is low — which is common on GLP-1 medicines — this makes logging quick enough that you will actually do it.
Beyond calories, GLP Trackr tracks your daily steps alongside your food, so you can see your activity and intake side by side over time. The weekly insights surface patterns — like whether higher-step days align with faster progress — turning scattered numbers into something genuinely useful to reflect on or bring to an appointment with your prescriber.
For a deeper look at energy needs by sex and lifestyle, see daily calorie needs for men or the related guide on how many calories a man needs per day — both can help put your own estimate in context.
General calorie figures are educational starting points. For personalised dietary targets that suit your health history and your current medicine, speak with your prescriber or a registered dietitian — they know your full picture in a way no calculator can.
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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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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.
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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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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.
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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.
Most adults burn roughly 1,600–3,000 calories per day in total, depending on age, body size, sex, and activity level. This is an estimate — individual metabolism varies, so use any figure as a guide rather than a fixed number.
BMR (Basal Metabolic Rate) is the calories your body needs at complete rest to sustain basic functions. TDEE (Total Daily Energy Expenditure) adds the calories burned through physical activity and digesting food, giving a more realistic daily total.
GLP-1 medicines like Mounjaro and Wegovy work primarily by reducing appetite and slowing stomach emptying. Their direct effect on your metabolic rate is a question best discussed with your prescriber, as individual responses vary.
GLP Trackr lets you log food via AI photo scan, set a calorie target, and track daily steps, so intake and activity sit side by side. This makes it easy to spot patterns over time without needing separate apps or spreadsheets.
Formula-based calculators give a useful estimate, but they cannot account for every individual factor — muscle mass, hormonal variation, and health conditions all influence real-world calorie burn. Treat any figure as a starting point and adjust based on your own tracked data over time.