BMI Calculator

Age

Gender

Height

Weight kg

Results

Enter your information and click calculate to see your BMI results

BMI Categories

Classification	BMI Range (kg/m²)	Health Risk
Severe Thinness	< 16	High
Moderate Thinness	16 - 17	Moderate
Mild Thinness	17 - 18.5	Low
Normal	18.5 - 25	Minimal
Overweight	25 - 30	Increased
Obese Class I	30 - 35	High
Obese Class II	35 - 40	Very High
Obese Class III	> 40	Extremely High

About BMI

Body Mass Index (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.

BMI is calculated by dividing a person's weight in kilograms by their height in meters squared (kg/m²). The resulting number indicates whether the person is underweight, normal weight, overweight, or obese.

BMI Formula:

BMI = weight (kg) / height² (m²)

BMI = (weight (lbs) / height² (inches)) × 703

BMI Limitations

While BMI is a useful screening tool, it has limitations and should not be used as a diagnostic tool. BMI cannot distinguish between muscle and fat mass.

Athletes may have higher BMI due to muscle mass
Older adults may have more body fat at the same BMI
May not be accurate for all ethnic groups
Should be used alongside other health assessments