BMR Calculator: What is BMR, and what is the Difference between RMR and BMR?

BMR Calculator: What is BMR, and what is the Difference between RMR and BMR?

Welcome to, your ultimate source for understanding BMR (Basal Metabolic Rate) and clarifying the difference between RMR (Resting Metabolic Rate) and BMR. Our BMR Calculator provides accurate estimations of your BMR, which is the number of calories your body needs to maintain basic bodily functions at rest. Explore the nuances of BMR and RMR with our comprehensive guide and leverage the power of our BMR Calculator at to optimize your nutrition and fitness journey.

What is a BMR?

BMR is the Basal Metabolic Rate of a person. It determines how many calories your body needs when at rest. The amount of energy your body utilizes to support the functioning of your vital organs. These include breathing, blood circulation, and other organs of the body. Most of the energy is used by the central nervous system and liver.

The regulation of fluid volumes uses the most energy. It is the ion level in the mechanical work of contracted muscles. The number of various substances is automatically corrected by altering the concentrations. So it means transporting substances from space. It requires some energy.

If the whole body is considered, there is much energy used. It certainly reasons why the ventral nervous system uses energy in the form of BMR. During a neural impulse, many ions are changed. After that, they change and alter their original places.

Humans tend to use more energy than their BMR. It is a fact as humans tend to move a lot for work and other things. Activities like walking, talking, running, and more. One needs to be physiologically and physically inactive. BMR is often measured during a nap.

The BMR accumulates 60-75% of the total energy utilized. It is the TTE based on a person's activity level and lifestyle. So the amount of energy utilized is the number of calories burned daily. The other calculation of TTE comes through physical activities and the digestion of food. Physical activities utilize 20 percent depend on TTE. BMR decreases with age and if one has a lean body. If a person increases muscle mass and it also increases the BMR. Many factors affect the BMR of a person. It also varies from person to person.

What is the difference between BMR vs RMR?

BMR and RMR are used very interchangeably. RMR is the resting metabolic rate. The terms are similar, so it can get confusing.
RMR is a person's energy expenditure without moving the body. But it includes the energy the body uses to digest the food.

In the case of BMR, food digestion accounts for 10 percent of total energy expenditure. Hence RMR has a better and higher value than BMR. There are various formulas used to determine the RMR and BMR value. The commonly used formulas are Harris-Benedict and Mifflin St Jeor.


BMR Calculator calculates the calories burnt while a person is at rest. It does include some activities which still need to be done physically. But they happen internally.

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