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At 5'3" and 320 lbs, your BMI is 56.7, placing you in the Obese Class III category. A BMI of 56.7 falls in the Class III (severe) obesity range (40 and above). Medical guidance is strongly recommended alongside lifestyle changes.
56.7
BMI
Obese Class III
Category
104-141
Healthy range (lbs)
-179 lbs
To healthy high
BMI 56.7: Obese Class III
| BMI | Category | Weight (lbs) | Your Status |
|---|---|---|---|
| Below 18.5 | Underweight | Below 104 lbs | - |
| 18.5 to 24.9 | Normal | 104 to 141 lbs | Goal range |
| 25.0 to 29.9 | Overweight | 142 to 169 lbs | - |
| 30.0+ | Obese | Above 169 lbs | You are here |
Your BMI of 56.7 puts you in the Obese Class III category for someone 5'3".
To reach the upper boundary of the healthy range (141 lbs), you would need to lose approximately 179 lbs. A sustainable rate is 0.5 to 1 lb per week, which means roughly 239 weeks at a moderate calorie deficit.
Keep in mind that BMI does not account for muscle mass. Two people at 5'3" and 320 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
For someone 5'3", the healthy weight range based on BMI is 104 to 141 lbs. At 104 lbs, BMI is 18.5 (lower boundary of healthy). At 141 lbs, BMI is 24.9 (upper boundary of healthy). Below 104 lbs is underweight; above 141 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 56.7 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 56.7 at 5'3" 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 104 to 141 lbs for someone 5'3".
At 5'3", a weight of 320 lbs gives a BMI of 56.7, which is in the Obese Class III category. The healthy weight range for 5'3" is 104 to 141 lbs. This is above the healthy range. Keep in mind BMI does not account for muscle mass or body composition.
To reach low end (104 lbs)
216 lbs to lose
To reach high end (141 lbs)
179 lbs to lose
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