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At 6'5" and 340 lbs, your BMI is 40.3, placing you in the Obese Class III category. A BMI of 40.3 falls in the Class III (severe) obesity range (40 and above). Medical guidance is strongly recommended alongside lifestyle changes.
40.3
BMI
Obese Class III
Category
156-210
Healthy range (lbs)
-130 lbs
To healthy high
BMI 40.3: Obese Class III
| BMI | Category | Weight (lbs) | Your Status |
|---|---|---|---|
| Below 18.5 | Underweight | Below 156 lbs | - |
| 18.5 to 24.9 | Normal | 156 to 210 lbs | Goal range |
| 25.0 to 29.9 | Overweight | 211 to 252 lbs | - |
| 30.0+ | Obese | Above 252 lbs | You are here |
Your BMI of 40.3 puts you in the Obese Class III category for someone 6'5".
To reach the upper boundary of the healthy range (210 lbs), you would need to lose approximately 130 lbs. A sustainable rate is 0.5 to 1 lb per week, which means roughly 174 weeks at a moderate calorie deficit.
Keep in mind that BMI does not account for muscle mass. Two people at 6'5" and 340 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
You would need to lose approximately 130 lbs to reach the high end of the healthy range. The healthy BMI range (18.5 to 24.9) corresponds to 156 to 210 lbs for someone 6'5". 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.
For someone 6'5", the healthy weight range based on BMI is 156 to 210 lbs. At 156 lbs, BMI is 18.5 (lower boundary of healthy). At 210 lbs, BMI is 24.9 (upper boundary of healthy). Below 156 lbs is underweight; above 210 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 40.3 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.
To reach low end (156 lbs)
184 lbs to lose
To reach high end (210 lbs)
130 lbs to lose
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