Calculate BMI value and corresponding weight status

BMI introduction:

- BMI is a measurement of a person's leanness or corpulence based on their height and weight, and is intended to quantify tissue mass.

- It is widely used as a general indicator of whether a person has a healthy body weight for their height

- Specifically, the value obtained from the calculation of BMI is used to categorize whether a person is underweight, normal weight, overweight, or obese depending on what range the value falls between

Use the "Metric Units" for the International System of Units.

Feature:

- Calculator BMI for adults (age > 20) & children (age from 0 -> 20)

- With adults (age > 20), we use same formula to calculator for Male & Female

- With children (age from 0 -> 20), we use different formula to calculator for Male & Female

- Information about BMI value

Recommended body weight based on BMI values for adults. It is used for both men and women, age 18 or older:

Severe Thinness (< 16 kg/m2)

Moderate Thinness (16 - 17 kg/m2)

Mild Thinness (17 - 18.5 kg/m2)

Normal (18.5 - 25 kg/m2)

Overweight (25 - 30 kg/m2)

Obese Class I (30 - 35 kg/m2)

Obese Class II (35 - 40 kg/m2)

Obese Class III (> 40 kg/m2)