BMI below 18.5 is Underweight
BMI of 18.5 24.9 is Normal
BMI of 25.0 29.9 is Overweight
BMI 30.0 and above is Obese
Here are a couple of websites that will calculate your BMI.
I weigh 185 lbs. and am 5'11". According to the BMI, I am overweight. Now, not too long ago, I certainly was overweight, but now I run around 35 miles a week. No way I'm overweight.
I have not gut and my cloths that I wore 40 years ago as a teenager still fit.