Use the formula: BMI = weight in kilograms ÷ height in meters squared
If using pounds and inches: BMI = (weight in pounds × 703) ÷ height in inches squared
Measure your weight accurately
Measure your height accurately
Square your height value
Divide your weight by the squared height
If using pounds and inches, multiply weight by 703 before dividing
Compare the result to BMI categories
Under 18.5 = underweight
5 to 24.9 = normal weight
0 to 29.9 = overweight
0 and above = obese