Calculate Your Body Mass Index (BMI) Accurately

The Body Mass Index (BMI), historically known as the Quetelet index, is an anthropometric measure defined as body mass divided by the square of body height: BMI = mass(kg) / (height(m))^2. When working with imperial units, the formula applies a conversion constant: BMI = 703 * mass(lbs) / (height(in))^2. The World Health Organization categorizes adult BMI values into standardized brackets: Underweight (< 18.5), Normal Weight (18.5 - 24.9), Overweight (25.0 - 29.9), and Obesity (Class I: 30-34.9, Class II: 35-39.9, Class III: >= 40.0). Khalasna's calculation engine applies these formulas using high-precision client-side arithmetic. It also solves the inverse equation to compute your healthy weight boundaries: Mass_min = 18.5 * (height)^2 and Mass_max = 24.9 * (height)^2. While BMI is a reliable population-level screening metric, our interface notes clinical caveats: it does not distinguish between adipose tissue (body fat) and lean muscle mass, meaning athletic individuals may register in higher brackets despite excellent cardiovascular fitness.