Measure your weight in kilograms or pounds
Measure your height in meters or inches
Use the BMI formula: BMI = weight ÷ height²
If using metric units: BMI = kg ÷ m²
If using imperial units: BMI = (lb ÷ in²) × 703
Calculate the result
Compare the result to BMI categories:
Below 18.5 = Underweight
5 to 24.9 = Normal weight
0 to 29.9 = Overweight
0 and above = Obesity