Basal Metabolic Rate

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This tool allows you to determine your basal metabolic rate according to the Mifflin – St Jeor equation.

The basal metabolic rate (BMR) can be defined as the minimum amount of energy that a person needs every day to keep the body functioning at complete rest. The processes that the body needs to function include breathing, blood circulation, controlling body temperature, cell growth, brain and nerve function, and contraction of muscles. Basal metabolic rate affects the rate that a person burns calories and ultimately whether that individual maintains, gains, or loses weight. The basal metabolic rate accounts for about 60 to 75% of the daily calorie expenditure by individuals. BMR typically declines by 1–2% per decade after age 20, mostly due to loss of fat-free mass.

The basal metabolic rate (BMR) increases with muscle mass, body surface, male gender, body temperature, thyroid hormones, nervous system activity,certain stages of life cycle, caffeine and tobacco.

The Mifflin – St Jeor equation is a formula to estimate the basal metabolic rate (BMR), where the BMR can be calculated as follows:

  1. Men: BMR = 10 × weight (kg) + 6.25 × height (cm) – 5 × age (y) + 5
  2. Women: BMR = 10 × weight (kg) + 6.25 × height (cm) – 5 × age (y) – 161
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  • Select the unit system
  • Enter your gender, weight, height and age.
  • The results will appear automatically below, expressed in Kilocalories per day.


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