How BMR Works and Why It Matters for Your Calorie Picture
BMR represents your body's minimum energy requirement — the metabolic rate calories your system needs before any movement or digestion is factored in. It is often the largest single component of your total daily energy expenditure, typically accounting for around 60–70% of the calories you burn each day, though this varies between individuals.
What influences your BMR?
- Body composition: Muscle tissue is more metabolically active than fat tissue, so people with more lean mass tend to have a higher BMR.
- Age: BMR generally declines gradually with age, in part because of changes in muscle mass over time.
- Height and weight: Larger bodies require more energy to maintain basic functions.
- Biological sex: On average, metabolic rate differs between sexes, largely due to differences in body composition.
How to estimate basal metabolic rate
The most widely used formulas to work out basal metabolic rate are the Mifflin-St Jeor equation and the Harris-Benedict equation. Both take height, weight, age, and sex as inputs to produce a calorie estimate. These are estimates rather than precise measurements — individual variation means your true BMR may differ, but they give a useful working figure.
If you want to go deeper on the calculation itself, our guide on how to work out your basal metabolic rate walks through the steps in detail.
It is also worth knowing that the medicines you have been prescribed can influence factors connected to energy balance. For context on the wider physiological picture, the page covering how Mounjaro works explains the underlying mechanisms — and if you have noticed your heart rate changing, there is specific information on why Mounjaro may affect heart rate and whether Wegovy has a similar effect.
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Using Your BMR Alongside GLP Trackr
Knowing your estimated BMR becomes most useful when it is connected to your actual daily intake — and that connection is where GLP Trackr comes in. The app lets you set a calorie target informed by your BMR and activity level, then log every meal against it effortlessly using the AI photo scan: point your camera at a plate and get an instant calorie and protein breakdown without manual entry.
On a GLP-1 journey, appetite often changes week to week. The daily check-in feature lets you log your food-noise level alongside your calorie data, so over time you can see how your intake patterns relate to your progress. These logged trends can also be a helpful reference when you speak to your prescriber or a registered dietitian about your nutrition goals.
Bear in mind that BMR calculators provide a general estimate, not a personalised medical prescription. Any specific calorie or nutrition targets for your situation are best agreed with your healthcare professional, who knows your full history.
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Frequently asked questions.
Basal metabolic rate (BMR) is the number of calories your body needs at complete rest to maintain essential functions such as breathing, circulation, and cell repair. It is typically the largest part of your total daily calorie expenditure.
BMR is commonly estimated using formulas such as the Mifflin-St Jeor or Harris-Benedict equations, which use your height, weight, age, and sex. These give a useful working figure, though individual variation means the result is an estimate rather than an exact measurement.
When appetite and food intake change — as many people experience on Mounjaro or Wegovy — understanding your BMR helps you make sense of your energy balance. It gives a baseline from which to set realistic calorie targets in discussion with your prescriber or a dietitian.
Yes. BMR can shift with changes in body composition, age, and other factors. Tracking your food intake and weight over time gives you a clearer picture of how your metabolism is responding, which is worth discussing with your healthcare professional.
GLP Trackr lets you set a calorie target based on your BMR and activity level, then log meals using AI photo scanning, barcode scan, or search. Your intake is tracked daily, making it easier to spot patterns and stay consistent with the goals you have set.