What goes into a weight-loss calorie calculation?
A calorie target for weight loss is built from two numbers: your Total Daily Energy Expenditure (TDEE) — roughly how many calories your body uses each day — and a planned deficit below it. Your TDEE depends on your basal metabolic rate (the energy your body needs at rest), your weight, height, age, and how active you are day to day.
A general framework
Most general guidance suggests that a daily deficit of roughly 500 calories can support a loss of around 0.5 kg (1 lb) per week, though individual results vary considerably. These are educational reference points, not a personal prescription — your own starting point will depend on factors your prescriber or doctor knows about your health history.
- Calories for weight loss — women: general adult female estimates often fall in the range of 1,400–1,800 calories per day during active weight loss, but this is a broad population average, not a target for any one person.
- Calories for weight loss — men: general adult male estimates are typically higher, often cited around 1,800–2,200 calories per day during active weight loss, again as a broad educational range only.
- Protein matters: on a GLP-1 medicine, appetite is often reduced, so the calories you do eat should work hard — many people find prioritising protein helps preserve muscle while eating less overall.
Why GLP-1 medicines change the picture
Medicines like Mounjaro (tirzepatide) and Wegovy (semaglutide) act on appetite-regulating pathways, meaning many people eat noticeably less without much effort. This can make hitting even a moderate calorie target feel challenging on higher doses. Tracking what you actually consume — rather than guessing — gives you and your prescriber a clearer picture of whether your intake is adequate. For a deeper look at daily calorie needs, see our guide on how many calories to eat each day, and for sex-specific breakdowns visit calorie needs for women or calorie needs for men.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
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Manually calculating and logging calories is where many people drop off — but GLP Trackr makes it genuinely effortless. The app's AI food photo scan is the fastest way to log a meal: point your camera at your plate and the app estimates calories, protein, and macros instantly, with no typing required. For packaged foods, the barcode scanner pulls nutrition data in a single tap.
Once you have set a daily calorie or protein target inside the app, every meal you log is tracked against it automatically. You can see at a glance whether you are hitting your goals or drifting — useful information to bring to your next prescriber appointment alongside your weight trend. The daily check-in also lets you log weight, energy, and food-noise levels each morning, so you can spot whether lower calorie days correlate with how you feel on any given week.
For a full breakdown of calorie calculators and how to use them on your GLP-1 journey, the calorie calculator hub brings everything together in one place.
GLP Trackr provides general tracking and informational tools — it is not a substitute for advice from your prescriber or doctor, who can guide you on calorie targets that suit your individual health needs.
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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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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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Frequently asked questions.
There is no single answer — calorie needs vary by weight, height, age, sex, and activity level. A general educational reference is a deficit of around 500 calories below your daily expenditure. Your prescriber or doctor can advise on a target suited to your individual circumstances.
A calorie deficit means consuming fewer calories than your body uses each day. Over time, the body draws on stored energy to make up the gap. A modest, sustainable deficit — rather than a drastic one — is generally considered the practical approach for most people.
Generally yes — men typically have a higher basal metabolic rate and lean body mass than women, so broad population estimates for daily calories tend to be higher. Individual factors matter far more than averages, so treat any general figure as educational rather than a personal target.
GLP Trackr lets you log meals by AI photo scan, barcode, or manual search, then tracks your calories and protein against a target you set. The daily check-in and weight charts help you see patterns over time — useful information to review with your prescriber.
No — calorie calculators provide useful general estimates, but they cannot account for your full health picture. Always discuss calorie targets with your prescriber or doctor, especially when taking a prescription medicine like Mounjaro or Wegovy.