BMI Calculator

Units Type

US/UK Units Metric Units

Height

Weight

BMI

kg/m²

BMI Category

BMI Sub-Category

BMI Index

Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. It is widely used as a common indicator of whether a person has a healthy body weight for their height. The value obtained from the calculation of BMI is used to categorize whether a person is underweight, normal weight, overweight, or obese depending on the range in which it falls.

BMI Formula

The formula used for calculating the BMI index in (kg/m²) is given below:

BMI(kg/m²) = mass(kg) / height²(m)

Alternatively, it can also be expressed as:

BMI(kg/m²) = mass(lb) / height²(in) × 703

BMI Category

BMI Range	BMI Category	BMI Sub-Category
< 16	Underweight	Severe Thinness
16 - 17		Moderate Thinness
17 - 18.5		Mild Thinness
18.5 - 25	Normal	Normal
25 - 30	Overweight	Overweight
30 - 35	Obese	Obese Class I
35 - 40		Obese Class II
> 40		Obese Class III

BMI chart for adults

This is a graph of BMI categories Based on the World Health Organization data, . The dashed lines represent subdivisions within a major categorization.