Body Mass Index (BMI)

Also called Quetelet index

The body mass index (BMI) or Quetelet index is a value derived from the mass (weight) and height of an individual. The BMI is defined as the body mass divided by the square of the body height, and is universally expressed in units of kg/m2, resulting from mass in kilograms and height in metres.

The BMI is an attempt to quantify the amount of tissue mass (muscle, fat, and bone) in an individual, and then categorize that person as underweight, normal weight, overweight, or obese based on that value. However, there is some debate about where on the BMI scale the dividing lines between categories should be placed.

Measurement

Height (stature): Standing height is the measurement the maximum distance from the floor to the highest point on the head, when the subject is facing directly ahead. Shoes should be off, feet together, and arms by the sides. Heels, buttocks and upper back should also be in contact with the wall when the measurement is made. Height measurement can vary throughout the day, usually being higher in the morning, so to ensure reliability height should be measured at the same time of day.

Body weight (mass): To improve reliability, weigh routinely in the morning (12 hours since eating). Body weight can be affected by fluid in the bladder (weigh after voiding the bladder).

In each procedure the person stands with minimal movement with hands by their side. Shoes and excess clothing should be removed.

Calculator

Height (in centimeters):

Weight (in kilograms):

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Results

Your BMI is and your BMI Prime is

What should I do now?

If there is something wrong, you should consults your health problems with your physician. This index is only indicator of potential healthy risks and it is not absolutely reliable.