What Determines How Many Calories You Burn Each Day?
Your total daily energy expenditure (TDEE) is made up of three main components, and knowing each one helps you understand where your calorie burn actually comes from.
Basal Metabolic Rate (BMR)
The largest share — roughly 60–70% for most people — is your BMR: the energy your body uses just to keep you alive while at rest. Breathing, circulation, cell repair, and maintaining body temperature all consume kilocalories continuously. BMR is influenced primarily by your lean body mass, height, age, and biological sex. As you lose weight, BMR tends to decrease slightly, which is one reason progress can slow over time.
Physical Activity
Movement of any kind — a formal workout, a walk to the shops, or simply standing rather than sitting — adds to your daily burn. Structured exercise typically accounts for a smaller share of total expenditure than many people expect; everyday movement (sometimes called NEAT, or non-exercise activity thermogenesis) often matters more in total across a day. For a deeper look at what exercise specifically contributes, the page on calories burned during a workout covers this in more detail.
Thermic Effect of Food
Digesting and processing food itself costs energy — roughly 10% of total intake for a mixed diet, and slightly higher for protein-heavy meals. This is one reason high-protein eating is often recommended alongside GLP-1 medicines: protein supports muscle retention and costs more energy to metabolise.
General Ranges (Educational)
As a broad educational reference:
- Sedentary adults (desk-based, minimal activity): approximately 1,600–2,000 kcal/day
- Moderately active adults (light exercise a few times a week): approximately 2,000–2,500 kcal/day
- Active adults (regular, vigorous exercise): approximately 2,500–3,000+ kcal/day
These are general population ranges, not personalised targets. Individual variation is significant, and anyone with specific health conditions should discuss their energy needs with their prescriber or a registered dietitian. You can also explore how many calories a person typically burns in a day and the factors that shift that figure.
If you want to calculate a more personalised estimate, the GLP Trackr calorie calculator hub brings together the tools to do that.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Track Your Daily Calorie Burn Automatically with GLP Trackr
Knowing the theory is one thing; seeing your own numbers day-to-day is where it becomes actionable. GLP Trackr's targets feature lets you set a daily calorie goal based on your own situation, then tracks your intake against it in real time — so you always know where you stand without mental arithmetic.
Because appetite on Mounjaro or Wegovy can vary considerably from day to day (and often drops significantly, especially after a dose change), the app's AI photo-scan food logging makes capturing what you actually eat as frictionless as possible: point your camera at a meal and get an instant calorie and macro breakdown. Paired with the barcode scanner and food search, logging stays consistent even on low-appetite days when you are eating very little.
The daily check-in also captures steps and energy alongside food data, giving you a fuller picture of expenditure and intake over time — useful context to bring to a conversation with your prescriber or doctor about how your journey is progressing. For a related perspective on daily calorie burn targets, see how many calories you should aim to burn each day.
GLP Trackr is available free on the App Store and Google Play — give it a go with a 7-day free trial and see your calorie picture come together in one place.
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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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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 between 1,600 and 3,000 kilocalories per day, depending on body size, age, sex, and activity level. Sedentary adults tend toward the lower end; regularly active adults toward the higher end. These are general ranges — your individual number will vary.
Calories consumed is the energy you take in from food and drink. Calories burned is the energy your body uses through metabolism and movement. When intake consistently exceeds expenditure over time, weight tends to increase; when expenditure exceeds intake, weight tends to decrease — though many individual factors influence this.
These medicines primarily reduce appetite and calorie intake rather than directly increasing calorie burn. Losing weight over time can slightly lower your basal metabolic rate. Any questions about how this affects your personal situation are best discussed with your prescriber or doctor.
You can estimate your total daily energy expenditure using a TDEE calculator, which factors in your weight, height, age, sex, and activity level. The GLP Trackr calorie calculator provides a guided estimate. For a personalised target, speak with your healthcare professional or a registered dietitian.
GLP Trackr lets you set a daily calorie target and logs your food intake against it using photo scan, barcode, or search. The daily check-in captures steps and activity data too, giving you a rounded picture of your intake and expenditure over time.