are you overweight for your age
- Adults are underweight if their BMI is below 18.5, healthy weight if their BMI is 18.5 to 24.9, overweight if their BMI is 25 to 29.9, and obese if their BMI is 30 or above. *A childâs BMI percentile is calculated by comparing your childâs BMI to growth charts for children who are the same age and sex as your child.