- Wednesday, Nov 07 2012
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This is a free BMR Calculator. It will calculate your Basal Metabolic Rate (MBR), i.e. the calories you are going to burn if you just stay in bed all day. Your BMR depends on your gender, weigh, height, and age. It decreases when your age increases, which means the older you get the harder it becomes to stay slim (unless you excercise or keep diet)...
Basal Metabolic Rate (BMR), is the amount of energy expended daily by humans and other animals at rest. Rest is defined as existing in a neutrally temperate environment while in the post-absorptive state. In plants, different considerations apply. The release, and using, of energy in this state is sufficient only for the functioning of the vital organs, the heart, lungs, nervous system, kidneys, liver, intestine, sex organs, muscles, and skin...
Swings in body temperature – either hotter or cooler – increase the metabolic rate, thus burning more energy. Prolonged exposure to extremely warm or very cold environments increases the basal metabolic rate (BMR). People who live in these types of settings often have BMRs 5–20% higher than those in other climates. Physical activity also significantly increases body temperature, which in turn uses more energy from respiration...
This calculator is based on the widely used and accepted Harris-Benedict equations for BMR. They are shown below:
- Male (metric): BMR = (13.75 x WKG) + (5 x HC) - (6.76 x age) + 66
- Male (imperial): BMR = (6.25 x WP) + (12.7 x HI) - (6.76 x age) + 66
- Female (metric): BMR = (9.56 x WKG) + (1.85 x HC) - 4.68 x age) + 655
- Female (imperial): BMR = (4.35 x WP) + (4.7 x HI) - 4.68 x age) + 655
- HC = Height in Centimetres
- HI = Height in Inches
- WKG = Weight in Kilograms
- WP = Weight in Pounds
The equations above are exactly the same as those used for our Daily Caloric Expenditure Calculator, except that the "Activity Level Factor" that is used for the Daily Caloric Expenditure Calculator has been removed here. In the Daily Caloric Expenditure Calculator, BMR was multiplied by the "Activity Level Factor" to account for daily physical activity levels and the thermic effect of food (thereby providing an estimate of the total amount of calories you burn in a day), but these factors are not a consideration when determining BMR. The difference between the equations shown above and those on the Daily Caloric Expenditure Calculator is illustrative of the actual meaning of BMR...