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, calculate: BMI = kg ÷ m²
If using imperial units, calculate: BMI = (lb ÷ in²) × 703
Enter your values into a BMI calculator if you prefer
Compare the result to BMI categories:
Underweight: below 18.5
Normal weight: 18.5 to 24.9
Overweight: 25.0 to 29.9
Obesity: 30.0 and above