BMI/BMR Calculator

The basal metabolic rate (BMR) is the amount of energy needed while resting in a temperate environment when the digestive system is inactive. It is the equivalent of figuring out how much gas an idle car consumes while parked. In such a state, energy will be used only to maintain vital organs, which include the heart, brain, kidneys, nervous system, intestines, liver, lungs, sex organs, muscles, and skin. For most people, upwards of ~70% of total energy (calories) burned each day is due to upkeep. Physical activity makes up ~20% of expenditure and ~10% is used for the digestion of food, also known as thermogenesis.

The BMR is measured under very restrictive circumstances while awake. An accurate BMR measurement requires that a person’s sympathetic nervous system is inactive, which means the person must be completely rested. Basal metabolism is usually the largest component of a person’s total caloric needs. The daily caloric need is the BMR value multiplied by a factor with a value between 1.2 and 1.9, depending on activity level.

The body mass index (BMI) is a measure for adults (above 20 years old) to check what category their height and weight puts them in – underweight, healthy, or overweight. BMI is a screening measure and is not intended to diagnose disease or illness.

8. Maintaining a weight in the healthy BMI range is one way to support overall health as you age. The calculator will give you an idea of how your weight compares to common values. Body Mass Index (BMI) is calculated as your weight divided by the square of your height or BMI = weight/height2.

This calculator should only be used by adults. Pregnant, lactating women, children and professional Athletes should not rely on these BMI results and a professional doctor opinion should be taken.

9. 1. BMI Categories:

      Underweight = <18.5

      Normal weight = 18.5–24.9

      Overweight = 25–29.9

      Obesity = BMI of 30 or greater