BMI Calculator

BMI (Body Mass Index) is a measure of body fat based on height and weight. The formula is: BMI = weight (kg) ÷ height (m)². In imperial units: BMI = (weight in lbs × 703) ÷ (height in inches)². It's a quick screening tool, not a direct measure of body fat.

The WHO BMI categories are: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25.0–29.9), and Obese (30.0 and above). These ranges apply to adults aged 20 and older.

BMI has limitations. It doesn't distinguish between muscle and fat, so athletes may have a high BMI despite being healthy. It also doesn't account for age, sex, bone density, or fat distribution. It's best used as a general screening tool alongside other health measures.

A healthy BMI for adults is generally between 18.5 and 24.9. However, optimal BMI can vary based on age, sex, and ethnicity. Consult your healthcare provider for a personalized assessment that includes waist circumference, diet, physical activity, and family history.

To lower your BMI, focus on a balanced diet with a modest caloric deficit, regular physical activity (at least 150 minutes of moderate exercise per week), adequate sleep, and stress management. Aim for gradual, sustainable weight loss of 1–2 pounds per week.