Calculate My BMI Online - The BMI Formula

What is the body mass index?

Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women.
Enter your weight and height using standard or metric measures.
Click "Calculate My BMI" and your BMI will appear below.

How is BMI calculated formula?

BMI is your weight (in kilograms) over your height squared (in centimeters).
Let's calculate, however, using pounds and inches.
For instance, the BMI of a person who is 5'3" and weighs 125 lbs is calculated as follows: Multiply the weight in pounds by 0.45 (the metric conversion factor)

What is a good body mass index?

For adults 20 years and older:
A BMI below 18.5 (shown in white) is considered underweight.
A BMI of 18.5 to 24.9 (green) is considered healthy.
A BMI of 25 to 29.9 (yellow) is considered overweight.
A BMI of 30 or higher (red) is considered obese.

BMI Classification
< 18.5 underweight
18.5–24.9 normal weight
25.0–29.9 overweight
30.0–34.9 class I obesity
35.0–39.9 class II obesity
≥ 40.0 class III obesity
What is a good body mass index?