What is BMR?

Basal Metabolic Rate (BMR) is an estimate of the amount of energy expended while at rest in a comfortable environment with your digestive system inactive. The amount of energy your body is using in this state is for the bare mimimum required to for the functioning of your vital organs, such as heart, lungs, brain, liver, kidneys, muscles, and skin.

Basal metabolic rate (BMR) or the similar Resting Metabolic Rate (RMR) is by far the largest component of total caloric expenditure per day. Since these measurements are assuming your body is at rest, they need to be adjusted by a factor to account for your daily activity. In the 1990s and 2000s, several studies found that the BMR estimates typically are within 5% of the true caloric expenditures, so the results provide good estimates only.

Fill in your information below to find your estimated daily caloric expenditure and the numbers of calories you should consume per day to loose weight, maintain weight, or gain weight.


BMR Calculator


Activity Level

Category Definition
Sedentary   Little or no exercise
Lightly Active   Light exercise/sports 1-3 days/week
Moderately Active   Moderate exercise/sports 3-5 days/week
Very Active   Hard exercise/sports 6-7 days a week
Extremely Active   Very hard exercise/sports & physical job or 2x training