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At 6'4" and 100 lbs, your BMI is 12.2, placing you in the Underweight category. A BMI of 12.2 falls in the underweight range (below 18.5). This may indicate insufficient body mass for your height. Consulting a healthcare provider is recommended.
12.2
BMI
Underweight
Category
152-205
Healthy range (lbs)
+52 lbs
To healthy low
BMI 12.2: Underweight
| BMI | Category | Weight (lbs) | Your Status |
|---|---|---|---|
| Below 18.5 | Underweight | Below 152 lbs | You are here |
| 18.5 to 24.9 | Normal | 152 to 205 lbs | Goal range |
| 25.0 to 29.9 | Overweight | 206 to 246 lbs | - |
| 30.0+ | Obese | Above 246 lbs | - |
Your BMI of 12.2 puts you in the Underweight category for someone 6'4".
To reach the lower boundary of the healthy range (152 lbs), you would need to gain approximately 52 lbs. A safe rate of weight gain is 0.5 to 1 lb per week through a calorie surplus combined with resistance training to prioritize lean mass.
Keep in mind that BMI does not account for muscle mass. Two people at 6'4" and 100 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
A healthy weight for someone 6'4" is between 152 and 205 lbs, based on a BMI of 18.5 to 24.9. This range reflects the weights most associated with reduced risk of chronic disease. Individual factors like muscle mass, frame size, and body fat distribution also matter.
A BMI of 12.2 falls in the Underweight range. A BMI of 12.2 falls in the underweight range (below 18.5). This may indicate insufficient body mass for your height. Consulting a healthcare provider is recommended. 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 gain approximately 52 lbs to reach the low end of the healthy range. The healthy BMI range (18.5 to 24.9) corresponds to 152 to 205 lbs for someone 6'4". 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.
To reach low end (152 lbs)
52 lbs to gain
To reach high end (205 lbs)
105 lbs to gain
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