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At 5'8" and 300 lbs, your BMI is 45.6, placing you in the Obese Class III category. A BMI of 45.6 falls in the Class III (severe) obesity range (40 and above). Medical guidance is strongly recommended alongside lifestyle changes.
45.6
BMI
Obese Class III
Category
122-164
Healthy range (lbs)
-136 lbs
To healthy high
BMI 45.6: Obese Class III
| BMI | Category | Weight (lbs) | Your Status |
|---|---|---|---|
| Below 18.5 | Underweight | Below 122 lbs | - |
| 18.5 to 24.9 | Normal | 122 to 164 lbs | Goal range |
| 25.0 to 29.9 | Overweight | 165 to 197 lbs | - |
| 30.0+ | Obese | Above 197 lbs | You are here |
Your BMI of 45.6 puts you in the Obese Class III category for someone 5'8".
To reach the upper boundary of the healthy range (164 lbs), you would need to lose approximately 136 lbs. A sustainable rate is 0.5 to 1 lb per week, which means roughly 182 weeks at a moderate calorie deficit.
Keep in mind that BMI does not account for muscle mass. Two people at 5'8" and 300 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
For someone 5'8", the healthy weight range based on BMI is 122 to 164 lbs. At 122 lbs, BMI is 18.5 (lower boundary of healthy). At 164 lbs, BMI is 24.9 (upper boundary of healthy). Below 122 lbs is underweight; above 164 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 45.6 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 45.6 at 5'8" 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 122 to 164 lbs for someone 5'8".
At 5'8", a weight of 300 lbs gives a BMI of 45.6, which is in the Obese Class III category. The healthy weight range for 5'8" is 122 to 164 lbs. This is above the healthy range. Keep in mind BMI does not account for muscle mass or body composition.
To reach low end (122 lbs)
178 lbs to lose
To reach high end (164 lbs)
136 lbs to lose
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