What Determines How Many Calories You Burn Each Day?
Daily calorie expenditure is made up of several components working together. Getting a feel for each one helps explain why two people of similar weight can have quite different daily burns.
Basal Metabolic Rate (BMR)
The largest slice of your daily burn — typically 60–75% — is your Basal Metabolic Rate: the energy your body uses simply to keep you alive (breathing, circulation, cell repair) while at rest. BMR is largely shaped by your body composition, with more muscle mass meaning a higher resting burn. It also tends to decrease gradually with age.
Physical Activity
Movement — both planned exercise and everyday activity like walking, standing, and fidgeting (sometimes called NEAT, or Non-Exercise Activity Thermogenesis) — is the most variable component. A sedentary desk-based day and an active day involving several kilometres of walking can differ by several hundred kilocalories for the same person.
The Thermic Effect of Food
Digesting and processing food itself uses energy — roughly 10% of total intake on average. Protein has the highest thermic effect of the three macronutrients, which is one reason protein intake is often emphasised on a GLP-1 journey.
What the Averages Look Like
As a broad educational reference, many adults burn approximately:
- 1,600–2,000 kcal/day — smaller or sedentary individuals
- 2,000–2,500 kcal/day — moderate activity, average build
- 2,500–3,000+ kcal/day — larger body size or high activity levels
These are general population ranges, not personal targets. Your own number will depend on your individual circumstances, and any meaningful calorie goal should be discussed with your prescriber or a registered dietitian rather than set from a generic figure alone.
If you want to dig deeper into calorie needs specifically, see our guide on how many calories a person should consume in a day, or explore the figures for how many calories a man needs per day and daily calorie needs for men in more detail. For a full interactive estimate, visit our calorie calculator hub.
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Tracking Your Calorie Balance with GLP Trackr
Knowing a rough daily burn figure is most useful when you can compare it against what you are actually eating — and that is where consistent food logging makes the difference.
GLP Trackr's AI-powered food photo scan lets you point your camera at a meal and get an instant breakdown of calories, protein, and other macros without manually searching for every ingredient. On a GLP-1 journey, when appetite can be unpredictable and portions naturally smaller, this kind of effortless logging makes it far easier to stay on top of your numbers day to day.
Once your intake is logged, the app's daily targets feature lets you set a personalised calorie goal and track how close you are throughout the day — so the abstract idea of "how much I burn" starts to translate into something you can actually act on. You can also log steps, water, and protein targets alongside calories, building a fuller picture of your energy balance over time.
The app's insights then surface patterns across your data — for example, how your logged intake relates to your weekly weight trend — so you can have a much more informed conversation with your prescriber or doctor about what is and is not working for you.
Any specific calorie target should be guided by your healthcare professional, who knows your full health history. GLP Trackr helps you record and understand your own data — it is not a substitute for that clinical guidance.
Ready to connect your daily calorie burn to what you are actually eating? Download GLP Trackr on the App Store or Google Play and explore it free for your first 7 days.
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Frequently asked questions.
Most adults burn roughly 1,600 to 3,000 kilocalories per day. The exact figure depends on body size, age, sex, and activity level. More active or larger individuals tend to burn more; sedentary or smaller individuals tend to burn less.
Basal Metabolic Rate (BMR) — the energy used just to keep the body functioning at rest — accounts for roughly 60–75% of most people's daily calorie burn. Body composition, age, and sex all influence BMR significantly.
There is no single universal answer. Weight loss generally requires burning more calories than you consume over time, but the right target depends on your individual circumstances. Your prescriber or a registered dietitian can help you identify a realistic and safe goal.
GLP-1 medicines primarily work by reducing appetite and food intake rather than directly raising calorie burn. Any changes to your energy balance on these medicines are best discussed with your prescriber, who can take your full situation into account.
Logging your food consistently is the practical step. GLP Trackr lets you scan meals with your camera for an instant calorie and protein breakdown, set a daily calorie target, and review trends over time — making it easier to understand your own energy balance.