Body Mass Index Calculator

The Body Mass Index (BMI) is an indicator recognized by the World Health Organization (WHO) to assess a person's body composition. It helps determine if your weight is appropriate for your height.

Our free BMI calculator gives you instant results with a clear visual interpretation according to official WHO categories.

How to Use

Enter your height in centimeters in the first field
Enter your weight in kilograms in the second field
The result is displayed automatically with your BMI category
Refer to the table below to interpret your result

How is BMI Calculated?

BMI = Weight (kg) / Height² (m)

For example, a person weighing 70 kg and measuring 1.75 m will have a BMI of: 70 / (1.75 × 1.75) = 22.9

BMI Categories According to WHO

BMI	Category	Health Risk
< 18.5	Underweight	Increased
18.5 - 24.9	Normal weight	Low
25 - 29.9	Overweight	Moderate
30 - 34.9	Obesity class I	High
35 - 39.9	Obesity class II	Very high
≥ 40	Obesity class III	Extremely high

Limitations of BMI

BMI is a useful but imperfect indicator. It does not account for:

Muscle mass: Athletes may have a high BMI without excess fat
Age: Older people naturally lose muscle mass
Sex: Women naturally have more body fat than men
Fat distribution: Abdominal fat is more dangerous than peripheral fat
Ethnicity: Thresholds may vary between populations

Tips for a Healthy Weight

Balanced Diet

Focus on fruits, vegetables, lean proteins, and whole grains. Limit processed foods.

Physical Activity

Aim for at least 150 minutes of moderate activity per week, such as brisk walking or cycling.

Hydration

Drink enough water throughout the day (about 1.5 to 2 liters).

Sleep

Quality sleep (7-9 hours) helps regulate appetite-related hormones.

BMI Calculator