See When You Move Between BMI Categories

At 5 ft 8 in and 220 lb your BMI is about 33.5 (obese). Losing 1 lb per week, you would cross into the overweight range (BMI 30) in about 10 weeks and into the normal range (BMI 25) in roughly 32 weeks. The chart plots your BMI against the obese, overweight, and normal cutoff lines so you can see each milestone.