Question 1

What is BMI?

Accepted Answer

BMI (Body Mass Index) is a value derived from your weight and height used to screen for weight categories. It is calculated as weight (kg) divided by height squared (m²).

Question 2

How is BMI calculated?

Accepted Answer

BMI = weight (kg) ÷ height² (m²). In imperial units: BMI = (weight in lbs × 703) ÷ height² (inches²). For example, a person 1.75 m tall weighing 70 kg has a BMI of 70 ÷ 3.0625 ≈ 22.9.

Question 3

What is a healthy BMI range?

Accepted Answer

For adults: below 18.5 is underweight, 18.5–24.9 is normal weight, 25–29.9 is overweight, and 30 or above is obese. These ranges are the same for men and women.

Question 4

Does BMI work for children?

Accepted Answer

This calculator is designed for adults (20+). For children and teens, BMI is interpreted differently using age- and sex-specific growth chart percentiles.

BMI Calculator