bmi calculator

Body Mass Index

The Body Mass Index (BMI) was invented by Adolphe Quetelet in the mid-1800s and is a measure of body weight based on an individual's height. It does not provide for measuring a person's body-fat percentage, but can be used as an indicator of a person's healthy body weight. Because it is so easy to calculate and thus interpret, the BMI is the de-facto at-a-glance indicator of a person's physical condition.

How to Calculate your BMI

The BMI has two components: height and weight. It is calculated as follows:

BMI = mass(kg)

For a healthy person, this value would normally be between 18.5 and 24.9, but more athletic individuals may have a higher BMI for their height due the the extra muscle weight. BMI was originally intended as a measure for general population rather than individuals, however it remains popular due to its simplicity.

BMI for Children

The way BMI is used for children differs from Adults. The calculation is the same, but the end result is then compared to an average value for children of the same age. This means the BMI for children becomes a percentile rather than a defined 'underweight', 'overweight' and so on, and allows comparison with other children of the same sex and age.

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