Body Mass Index (BMI) Calculator
BMI is used to determine a person's weight in regard to their height
The BMI (Body Mass Index) is used by the medical profession to quickly and simply determine a person's weight in regard to their height.
From a straight forward calculation the BMI factor can be gained and gives a measure which can be used to determine if a person is underweight, of normal weight, overweight or obese. However, there is an argument against BMI.
Using the BMI calculator
Use the sliders on the calculator below to specify your height (in feet and inches) and weight (in either pounds or kilograms) and calculate your BMI.
- Monitor your BMI, weight, blood glucose and blood pressure online for free with myLifestyle
- You may also be interested in our BMR calculator and Waist to Hip ratio calculator
Using your BMI number
|18.5 to 24.9||Healthy weight|
|25 and above||Above ideal range|
Once you have your BMI number look at the table below to determine if you are underweight, normal, overweight or obese.
The calculation for BMI was invented by Adolphe Quetelet, a Belgian mathematician born in 1796.
He proposed that people's weight could be classified relative to an ideal weight for their height.
To this day, Body Mass Index is also referred to as the Quetelet index.
Criticisms of BMI
BMI, or Body Mass Index, calculates one's mass per unit of surface area.
Due to this, those with a high proportion of muscle (for example, athletes) may have a very high BMI.
However, this is no indication of their fitness nor of their general health. Furthermore, some critics argue that age isn't taken into consideration.