Body Mass Index (BMI) Calculator

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.

BMI Calculator
Height
Use the slider, or enter your height in Feet and Inches using the two textboxes.

Weight
Use the slider to choose your weight in either pounds or kilograms, alternatively you can use the textboxes.

Your BMI result is:

Using your BMI number

BMI to weight (WHO)
BMI Meaning
Below 18.5 Underweight
18.5 to 24.9 Healthy weight
25 to 29.9 Above ideal range
30 and above Obese

Once you have your BMI number look at the table below to determine if you are underweight, normal, overweight or obese.

Many people who are overweight never develop diabetes. owever, obesity has been statistically proven to increase type 2 diabetes risk and sleep disordered breathing.

BMI formula

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.

BMI (kg/m2) = mass (kg) / height (m)2

BMI chart

BMI can also be determined using a chart that depicts BMI as a function of mass and height.

BMI chart

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.

Explore BMI