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At 5'6" and 310 lbs, your BMI is 50, placing you in the Obese Class III category. A BMI of 50 falls in the Class III (severe) obesity range (40 and above). Medical guidance is strongly recommended alongside lifestyle changes.
50
BMI
Obese Class III
Category
115-154
Healthy range (lbs)
-156 lbs
To healthy high
BMI 50: Obese Class III
| BMI | Category | Weight (lbs) | Your Status |
|---|---|---|---|
| Below 18.5 | Underweight | Below 115 lbs | - |
| 18.5 to 24.9 | Normal | 115 to 154 lbs | Goal range |
| 25.0 to 29.9 | Overweight | 155 to 185 lbs | - |
| 30.0+ | Obese | Above 185 lbs | You are here |
Your BMI of 50 puts you in the Obese Class III category for someone 5'6".
To reach the upper boundary of the healthy range (154 lbs), you would need to lose approximately 156 lbs. A sustainable rate is 0.5 to 1 lb per week, which means roughly 208 weeks at a moderate calorie deficit.
Keep in mind that BMI does not account for muscle mass. Two people at 5'6" and 310 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
A BMI of 50 falls in the Obese Class III range. A BMI of 50 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 156 lbs to reach the high end of the healthy range. The healthy BMI range (18.5 to 24.9) corresponds to 115 to 154 lbs for someone 5'6". 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 5'6", the healthy weight range based on BMI is 115 to 154 lbs. At 115 lbs, BMI is 18.5 (lower boundary of healthy). At 154 lbs, BMI is 24.9 (upper boundary of healthy). Below 115 lbs is underweight; above 154 lbs is overweight.
To reach low end (115 lbs)
195 lbs to lose
To reach high end (154 lbs)
156 lbs to lose
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