The energy your body uses just to stay alive
BMR, or Basal Metabolic Rate, is an estimate of how many calories your body needs to carry out basic, involuntary functions, breathing, circulation, cell repair, and maintaining body temperature, while completely at rest. It doesn't include the energy you burn through movement, exercise, or digestion; it's simply the baseline your body runs on before you do anything else in a day. This number is commonly used as a starting point for understanding overall daily energy needs, but it's an estimate based on a formula, not a measurement of your individual metabolism, which can vary based on factors like muscle mass, hormonal health, and genetics.
BMR Calculator
Calculate your Basal Metabolic Rate and estimate your daily calorie needs.
Your Basal Metabolic Rate (BMR)
Estimated calories your body needs at complete rest
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Estimated Daily Calorie Needs
Estimated Calorie Targets
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Weight Maintenance
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What is BMR?
Basal Metabolic Rate (BMR) is the estimated number of calories your body needs to perform essential functions while at complete rest. These functions include breathing, circulation and maintaining normal body temperature.
Your actual daily calorie requirements are usually higher than your BMR because they also include physical activity and the energy used to digest food.
Activity Levels
| Activity Level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.20 | Little or no exercise |
| Lightly Active | 1.375 | Exercise 1–3 days/week |
| Moderately Active | 1.55 | Exercise 3–5 days/week |
| Very Active | 1.725 | Exercise 6–7 days/week |
| Extremely Active | 1.90 | Intense exercise or physical job |
This calculator provides an estimate for informational purposes only. Individual calorie requirements can vary depending on body composition, health status, medications, activity and other factors. It should not replace personalised advice from a qualified healthcare professional or registered dietitian.
What people usually ask about their BMR result
A single BMR number can be hard to make sense of on its own, especially without knowing what it's meant to measure or how much weight to give it. Some people find the result higher or lower than they expected and aren't sure whether that's meaningful or just a quirk of the formula. Others want to know how to actually use the number, whether for tracking fitness goals, understanding daily energy needs, or simply out of curiosity about how their body works. Below are clear, straightforward answers to the questions we hear most often, covering how BMR is calculated, what affects it, how accurate it really is, and when it's worth discussing your result with a doctor rather than trying to interpret it alone.
BMR is the energy your body needs at complete rest, just to keep basic functions running. Your total daily calorie needs are higher than your BMR, since they also include energy used for movement, exercise, and digestion.
It's a reasonable estimate based on established formulas using age, gender, height, and weight, but it doesn't account for individual factors like muscle mass, hormonal conditions, or genetics, so actual metabolic rate can vary from the calculated result.
Not on its own. A BMR that seems unusually low or high compared to what you'd expect can sometimes relate to thyroid function or other conditions, but this needs a proper medical evaluation rather than a conclusion drawn from a calculator alone.
Yes. Muscle tissue burns more calories at rest than fat tissue, so individuals with higher muscle mass typically have a higher BMR than someone of the same height and weight with less muscle.
BMR is a useful starting point for understanding your body's baseline energy needs, but any specific dietary changes are best planned with a doctor or qualified professional who can consider your complete health picture, not a single calculated number.
Yes, BMR generally declines gradually with age, largely due to natural reductions in muscle mass over time, which is one reason calorie needs can shift as people get older even without a change in activity level.