Interactive BMI Calculator

Body Mass Index (BMI) is a simple numerical calculation that estimates tissue mass (muscle, fat, and bone) in an individual based on their height and weight. It is widely used as a screening tool by clinicians to categorize people into underweight, normal weight, overweight, or obese ranges.

While BMI is a useful benchmark, it does not directly measure body fat percentage or composition. It can be inaccurate for athletes or bodybuilders with high muscle mass (who may register as "overweight" or "obese" despite having very low body fat) and elderly individuals with reduced muscle mass (who may register as "normal" despite higher fat stores).

According to the World Health Organization (WHO), standard weight classifications are:

• Underweight: BMI less than 18.5
• Normal weight: BMI between 18.5 and 24.9
• Overweight: BMI between 25.0 and 29.9
• Obese: BMI of 30.0 or greater

The mathematical formula for BMI is weight divided by height squared: For imperial measurements, the formula is:

Improving your BMI involves shifting toward your target healthy weight classification. This can be achieved through regular aerobic and strength-building physical activities, a nutrient-dense diet focusing on whole foods, adequate sleep, and managing chronic stress. Consult a qualified medical practitioner before initiating any significant exercise or weight loss programs.