Measure body weight in kilograms (kg) or pounds (lb)
If using metric units, compute Body Mass Index (BMI): BMI = weight(kg) / [height(m)]²
If using imperial units, compute BMI: BMI = 703 × weight(lb) / [height(in)]²
Record height in meters (m) or inches (in) and weight in kg or lb as required by the formula
Report the result as BMI (kg/m²) for metric or BMI (unitless) for imperial
If you need an alternative “body mass” calculation, use body weight as the body mass (mass = weight under standard gravity)