Measure your weight in kilograms or pounds
Measure your height in meters, centimeters, inches, or feet
Use the BMI formula: BMI = weight in kg ÷ height in m²
If using pounds and inches, use: BMI = (weight in lb ÷ height in in²) × 703
Calculate the result
Compare the BMI value with standard BMI categories
Underweight: less than 18.5
Normal weight: 18.5 to 24.9
Overweight: 25 to 29.9
Obese: 30 or higher