Maintenance Calorie Calculator: What It Is and Why It Matters on a GLP-1 Journey

Your maintenance calorie level — sometimes called your Total Daily Energy Expenditure (TDEE) — is the number of calories that would keep your weight stable if you ate exactly that amount each day. Most calculators arrive at this figure by first estimating your Basal Metabolic Rate (BMR): the energy your body uses at complete rest just to keep you alive. An activity multiplier is then applied to reflect how much you move day to day.

What goes into the calculation

• Body weight — heavier bodies generally require more energy at rest
• Height — influences BMR alongside weight
• Age — metabolic rate tends to decrease gradually over time
• Biological sex — affects lean-muscle proportion and resting calorie burn
• Activity level — from sedentary (desk-based, little movement) to very active (structured exercise most days); steps calorie calculators and fitness calorie calculators use movement data to refine this further

Using the number on a GLP-1 journey

Once you have your maintenance figure, a calorie deficit calculator simply subtracts a daily amount from it — most general health guidance suggests a modest deficit rather than a steep one, to preserve muscle and support sustainable progress. For muscle-building goals, some people aim at or slightly above maintenance instead. Whatever your goal, the number is a starting reference, not a fixed rule — your actual needs shift as your weight changes and your activity evolves.

It is worth noting that GLP-1 medicines significantly change appetite for many people, which can make hitting even a modest calorie target feel effortful in either direction. Tracking what you are actually eating against your maintenance figure is often more informative than the calculation alone. You can explore how other aspects of your intake relate to your results with our free online calorie calculator, or see how Mounjaro users specifically approach their numbers with our Mounjaro calorie calculator guide. For a broader look at calorie tools available, visit our calorie calculator hub.

General educational guidance — such as that provided by national health bodies in various countries — typically frames maintenance calories as a useful baseline rather than a precise prescription, since individual metabolisms vary. Treat any calculator output as an informed estimate and adjust based on what your actual weight trend tells you over several weeks.

Knowing your maintenance figure is one thing; consistently logging what you eat against it is where most people find the real challenge — especially when appetite on a GLP-1 medicine can be unpredictable from day to day. GLP Trackr's AI food photo scan is the most practical way to close that gap: point your camera at a meal and the app returns an instant calorie and macronutrient breakdown, no manual searching required.

Once you have set a calorie target in the app — whether that is your maintenance figure, a deficit, or a protein-focused goal — GLP Trackr tracks your running daily total and shows you where you stand at a glance. The targets feature lets you set goals for calories, protein, water, and fibre in one place, so you are not juggling separate tools. For days when you prefer to search or scan a barcode rather than photograph a meal, both options are built in.

Over time, the insights section surfaces patterns from your own data — connecting what you ate, how you moved, how you slept, and how your weight responded — so your maintenance calculation becomes a living reference rather than a number you worked out once and forgot.

If you have specific questions about the right calorie target for your health goals or medical situation, your prescriber or doctor is the right person to ask — GLP Trackr is a tracking tool, not a clinical adviser, and no app output replaces personalised guidance from a healthcare professional.

Ready to put your maintenance number to work? Download GLP Trackr on the App Store or Google Play and start a free 7-day trial — your calorie, protein, and progress tracking all in one place.