What is normal BMI index?

BMI. BMI Categories: Underweight = <18.5, Normal weight = 18.5–24.9, Overweight = 25–29.9 & Obesity = BMI of 30 or greater. See: https://www.nhlbi.nih.gov/health/educational/lose_wt/BMI/bmicalc.htm.
BMI. In adults 20 years or older, the range is 18.5 to 24.9 for normal weight.
For adults, numbers . are: Below 18.5 Underweight 18.5 – 24.9 Normal 25.0 – 29.9 Overweight 30.0 & > Obese For children age 2-19, gender & age are factored in: < 5th%ile: Underweight. 5th%ile to <85th %ile: Normal weight. 85th%ile to <95th%ile: Overweight. 95th%ile or >: Obese.