Whether someone who weighs 220 pounds is considered obese depends largely on that person's height and body mass index as well as his percentage of body fat. For instance, a 5 foot 7 inch person who weighs 220 pounds has a BMI of 34.45, which is considered obese.
A 6 foot 4 inch person who weighs 220 pounds might only be considered overweight, with a BMI in the 27 range. The BMI measurement is not always accurate for people who are short or very muscular. Someone who is 5 feet 10 inches and weighs 220 pounds would be considered obese according to his BMI, but that person might only have 12 percent body fat, a very low percentage that would never be considered obese.