Free Online BMI Calculator

What is BMI?

BMI, or Body Mass Index, is a measure that uses your height and weight to work out if your weight is healthy. It is a widely used tool to categorize individuals into underweight, normal weight, overweight, and obese based on the resulting score.

How is BMI calculated?

BMI is calculated by dividing an individual's weight in kilograms by the square of their height in meters. The formula is: BMI = weight (kg) / (height (m))^2.

What do the BMI ranges mean?

• Underweight: BMI less than 18.5
• Normal weight: BMI 18.5–24.9
• Overweight: BMI 25–29.9
• Obese: BMI 30 or more

Is BMI a reliable health indicator?

While BMI is a useful screening tool for assessing a general category of weight, it does not directly measure body fat or account for muscle mass, bone density, overall body composition, and racial and sex differences. Therefore, it should not be used as a diagnostic tool but rather as a general guide to monitor weight status.

Can children and teenagers use the BMI formula?

Yes, but the interpretation of BMI scores for children and teens is different. Their BMI is age and sex-specific and is often referred to as BMI-for-age. It takes into account the variations in body composition among different ages and sexes during growth.

How can I improve my BMI?

Improving your BMI involves adopting a healthier lifestyle. This can include eating a balanced diet, engaging in regular physical activity, getting adequate sleep, and managing stress. It is important to consult with healthcare professionals for personalized advice.

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