Body mass index (BMI) is a value derived from the mass (weight) and height of a person.

BMI = \(\frac{\mathrm{body\ mass}}{\mathrm{body\ height}^2}\) [kg/m2]

The BMI is a convenient rule of thumb used to broadly categorize a person as

• underweight (BMI < 18.5)
• normal weight (18.5 \(\leq\) BMI < 25)
• overweight (25 \(\leq\) BMI < 29.9)
• obese (BMI \(\geq\) 30)

Step 1: Slide bar to set height

Step 2: Slide bar to set weight

A general contour plot of BMI as a function of height and weight is shown below.

Output 1: Render your BMI value

Suppose that your height is set to 180 cm, and your weight to 65 kg, then your BMI should be calculated to be 20.0617284 kg/m\(^2\).

Output 2: Render your BMI category

The position of your BMI is annotated by an arrow.