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At 5'9" and 320 lbs, your BMI is 47.3, placing you in the Obese Class III category. A BMI of 47.3 falls in the Class III (severe) obesity range (40 and above). Medical guidance is strongly recommended alongside lifestyle changes.
47.3
BMI
Obese Class III
Category
125-169
Healthy range (lbs)
-151 lbs
To healthy high
BMI 47.3: Obese Class III
| BMI | Category | Weight (lbs) | Your Status |
|---|---|---|---|
| Below 18.5 | Underweight | Below 125 lbs | - |
| 18.5 to 24.9 | Normal | 125 to 169 lbs | Goal range |
| 25.0 to 29.9 | Overweight | 170 to 203 lbs | - |
| 30.0+ | Obese | Above 203 lbs | You are here |
Your BMI of 47.3 puts you in the Obese Class III category for someone 5'9".
To reach the upper boundary of the healthy range (169 lbs), you would need to lose approximately 151 lbs. A sustainable rate is 0.5 to 1 lb per week, which means roughly 202 weeks at a moderate calorie deficit.
Keep in mind that BMI does not account for muscle mass. Two people at 5'9" and 320 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
A healthy weight for someone 5'9" is between 125 and 169 lbs, based on a BMI of 18.5 to 24.9. This range reflects the weights most associated with reduced risk of chronic disease. Individual factors like muscle mass, frame size, and body fat distribution also matter.
A BMI of 47.3 falls in the Obese Class III range. A BMI of 47.3 falls in the Class III (severe) obesity range (40 and above). Medical guidance is strongly recommended alongside lifestyle changes. BMI is a population-level screening tool, not a diagnostic measure. Factors like waist circumference, body fat percentage, blood pressure, and cholesterol provide a more complete picture of metabolic health.
You would need to lose approximately 151 lbs to reach the high end of the healthy range. The healthy BMI range (18.5 to 24.9) corresponds to 125 to 169 lbs for someone 5'9". A sustainable rate of weight loss is 0.5 to 1 lb per week through a calorie deficit of 250 to 500 calories per day.
BMI is a useful screening tool but has real limitations. It does not distinguish between muscle and fat, so muscular athletes often show elevated BMI despite low body fat. It also does not account for where fat is stored. Waist-to-height ratio and body fat percentage are more precise measures. Use BMI as a starting point, not a definitive health verdict.
To reach low end (125 lbs)
195 lbs to lose
To reach high end (169 lbs)
151 lbs to lose
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