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At 5'9" and 350 lbs, your BMI is 51.7, placing you in the Obese Class III category. A BMI of 51.7 falls in the Class III (severe) obesity range (40 and above). Medical guidance is strongly recommended alongside lifestyle changes.
51.7
BMI
Obese Class III
Category
125-169
Healthy range (lbs)
-181 lbs
To healthy high
BMI 51.7: 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 51.7 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 181 lbs. A sustainable rate is 0.5 to 1 lb per week, which means roughly 242 weeks at a moderate calorie deficit.
Keep in mind that BMI does not account for muscle mass. Two people at 5'9" and 350 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
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.
For someone 5'9", the healthy weight range based on BMI is 125 to 169 lbs. At 125 lbs, BMI is 18.5 (lower boundary of healthy). At 169 lbs, BMI is 24.9 (upper boundary of healthy). Below 125 lbs is underweight; above 169 lbs is overweight.
BMI only uses height and weight. Body fat percentage measures actual fat tissue as a proportion of total weight, making it more precise for body composition assessment. Two people with the same BMI of 51.7 can have very different body fat percentages depending on muscle mass. Athletes often have BMI values above 25 while maintaining low body fat. Use body fat percentage to set specific fitness goals.
A BMI of 51.7 at 5'9" places you in the Obese Class III category. BMI (Body Mass Index) is calculated by dividing weight in pounds by height in inches squared, then multiplying by 703. The healthy range is 18.5 to 24.9, which translates to 125 to 169 lbs for someone 5'9".
To reach low end (125 lbs)
225 lbs to lose
To reach high end (169 lbs)
181 lbs to lose
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