The BMI and BSA Calculator is a practical tool that uses your weight and height to calculate two key health metrics: Body Mass Index (BMI) and Body Surface Area (BSA). This process not only gives you an insight into how your weight measures up to your height but also estimates your body’s surface area, which can be useful for medical assessments.

When using the calculator, you start by providing your weight, which can be in kilograms (kg) ranging from 2 to 500, or in pounds (lbs) from 4.4 to 1102. You also input your height, which can be measured in centimeters (cm) from 30 to 250 or in inches (in) from 12 to 98. If your measurements are in pounds or inches, the calculator will automatically convert these to metric units: pounds to kilograms using the formula weight (kg) = weight (lbs) / 2.20462, and inches to centimeters by height (cm) = height (in) * 2.54.

Calculating the BMI involves converting your height from centimeters to meters (height (m) = height (cm) / 100), and then applying the formula BMI = weight (kg) / (height (m) * height (m)). The resulting BMI is rounded to one decimal place for clarity. This value helps categorize your weight status into one of the following:

- Underweight: BMI less than 18.5
- Normal weight: BMI between 18.5 and 24.9
- Overweight: BMI between 25 and 29.9
- Obesity Class I: BMI between 30 and 34.9
- Obesity Class II: BMI between 35 and 39.9
- Obesity Class III: BMI 40 or above

These categories help quickly assess whether a person's weight could be considered healthy or if they fall into various stages of overweight or obesity.

For BSA, the calculator employs the Mosteller formula, which is BSA = √((height (cm) * weight (kg)) / 3600). This formula estimates the total surface area of the human body in square meters and provides a rounded value to two decimal places.

Understanding your BMI and BSA can be quite beneficial for evaluating body mass in relation to height and for calculating medical dosages based on body surface area. By interpreting BMI categories, the calculator offers a snapshot of potential health risks associated with weight, guiding you towards more informed health decisions.

Calculates Body Mass Index (BMI) and Body Surface Area (BSA) using the Dubois formula, providing assessments of body composition and size.

BMI Calculator (Body Mass Index and BSA)