Body Mass Index (BMI) is a measure of body fat based on height and weight. It is used by healthcare professionals as a screening tool to identify potential weight-related health risks. Our BMI calculator supports both metric (kg/cm) and imperial (lbs/inches) measurements. A BMI below 18.5 is considered underweight, 18.5–24.9 is healthy weight, 25–29.9 is overweight, and 30 or above is obese. While BMI is a useful screening tool, it does not directly measure body fat and may not be accurate for athletes, pregnant women, or the elderly. Always consult a healthcare professional for medical advice.