Calorie Intake to Lose Weight Calculator for GLP-1 Users

A calorie intake to lose weight calculator typically works in two steps: first it estimates your Total Daily Energy Expenditure (TDEE) — the calories your body burns across the day at your current activity level — and then it subtracts a deficit to produce a weight-loss target. A common general guideline is a deficit of around 500 kcal per day to aim for gradual loss, though the right figure for any individual depends on their starting point, activity, and the guidance of their prescriber or doctor.

What the calculator uses

• Basal Metabolic Rate (BMR): the calories your body needs at rest, estimated using your height, weight, age, and biological sex.
• Activity multiplier: adjusts BMR upward based on how active you are day to day — sedentary, lightly active, moderately active, or very active.
• Deficit setting: a moderate reduction — often 400–600 kcal below TDEE — to create conditions for gradual loss without extreme restriction.

Why this matters on a GLP-1 medicine

Mounjaro (tirzepatide) and Wegovy (semaglutide) act on appetite-regulating pathways, so many people find their hunger drops noticeably — sometimes so much that eating enough becomes the challenge rather than eating too little. Understanding your calorie target helps you stay above a sensible floor, prioritise protein, and avoid the muscle loss that can come with very low intake. It also gives you a reference point if appetite fluctuates between doses.

For a broader calorie target overview, see our calorie calculator hub. If you want to explore your deficit specifically, the calorie calculator to lose weight page goes deeper on deficit approaches. You may also find our calorie intake calculator useful for understanding your maintenance number first.

Calculating a target is the easy part — hitting it consistently every day is where most people need support, especially when GLP-1 appetite suppression makes meals feel optional. GLP Trackr's food logging feature is built for exactly this: point your camera at a meal and the AI photo scan returns an instant calorie and macronutrient breakdown, so logging takes seconds even when appetite is low.

Once your calorie and protein targets are set inside the app, every meal you log counts toward them in real time. The daily check-in captures your intake alongside weight, mood, energy, and food-noise levels, so over time you can see how your calorie consistency actually connects to your results — not just a single weigh-in but a full pattern. If you want to refine your target, the lose weight calculator can help you sense-check the numbers.

GLP Trackr also includes a meal plan library built around GLP-1-friendly eating — higher protein, gentle on digestion — so you are not starting from scratch when appetite is unpredictable.

The calorie figures produced by any calculator are general educational estimates. They are not a personalised medical prescription. Always discuss specific dietary targets with your prescriber or doctor, particularly if you have any underlying health conditions or your weight loss has stalled or accelerated unexpectedly.

Ready to put your calorie target to work? Download GLP Trackr on the App Store or Google Play and start your free 7-day trial — log your first meal with a photo scan and see your numbers update instantly.