0 – 15: Very severely underweight
15 – 16: Severely underweight
16 – 18.5: Underweight
18.5 – 25: Normal Range (healthy)
25 – 30: Overweight
30 – 35: Obese class I – Moderately obese
35 – 40: Obese class II – Severely obese
40+: Obese class III: Very severely obese
Body mass index (BMI) is a measure of your body weight per unit of height, calculated by dividing your weight in kilograms by your height in meters squared. Although not as accurate or useful as your body fat percentage, BMI gives you a general idea of whether or not you should lose weight.