Metric formula
BMI = weight in kg / height in m^2
Imperial formula
BMI = 703 x weight in lb / height in inches^2
Example
70 kg and 1.75 m: 70 / 1.75^2 = 22.86.
Limitations
BMI does not directly measure body fat or diagnose health.
Formula
BMI Formula
BMI is a height-and-weight index used as a rough adult screening measure.