Measure your weight in kilograms (kg) or pounds (lb)
Measure your height in meters (m) or centimeters (cm)
If using metric units:
BMI = weight (kg) / (height (m))²
If using centimeters:
Convert height to meters: height (m) = height (cm) / 100
BMI = weight (kg) / (height (m))²
If using imperial units:
Convert weight to pounds and height to inches
BMI = (weight (lb) / (height (in))²) × 703
Round BMI to one decimal place (optional)