Calculate your Body Mass Index instantly to check your general weight category.
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What is Body Mass Index (BMI)?
Body Mass Index, or BMI, is a simple measurement that uses a person's height and weight to estimate whether their body weight falls within a general health category. It is commonly used as a quick screening tool for adults.
The formula for BMI is based on weight in kilograms divided by height in meters squared. This gives a number that is compared with standard adult BMI ranges.
BMI = weight (kg) ÷ height (m²)
A higher or lower BMI may suggest that a person is underweight, at a normal weight, overweight, or obese. However, BMI does not directly measure body fat and should be used as a general guide rather than a medical diagnosis.
BMI Categories for Adults
BMI Range
Category
Less than 18.5
Underweight
18.5 – 24.9
Normal weight
25.0 – 29.9
Overweight
30.0 or higher
Obese
Medical Disclaimer: This BMI calculator is for informational purposes only. It should not be used as a substitute for professional medical advice, diagnosis, or treatment.
Frequently Asked Questions (FAQ)
BMI stands for Body Mass Index. It is a quick way to estimate whether a person's body weight is generally low, normal, high, or very high compared with their height.
BMI is calculated by dividing your weight in kilograms by your height in meters squared. For example, if a person weighs 70 kg and is 1.75 m tall, the BMI is 70 ÷ (1.75 × 1.75).
BMI is useful for many adults, but it is not perfect for everyone. It does not directly measure body fat and may not reflect the health status of athletes, children, older adults, or people with higher muscle mass.
Adult BMI categories are usually divided into underweight, normal weight, overweight, and obese based on standard numeric ranges. These categories help give a general interpretation of your BMI result.
Yes, this BMI calculator is completely free to use and works instantly in your browser.