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At 6'6" and 100 lbs, your BMI is 11.6, placing you in the Underweight category. A BMI of 11.6 falls in the underweight range (below 18.5). This may indicate insufficient body mass for your height. Consulting a healthcare provider is recommended.
11.6
BMI
Underweight
Category
160-215
Healthy range (lbs)
+60 lbs
To healthy low
BMI 11.6: Underweight
| BMI | Category | Weight (lbs) | Your Status |
|---|---|---|---|
| Below 18.5 | Underweight | Below 160 lbs | You are here |
| 18.5 to 24.9 | Normal | 160 to 215 lbs | Goal range |
| 25.0 to 29.9 | Overweight | 216 to 258 lbs | - |
| 30.0+ | Obese | Above 258 lbs | - |
Your BMI of 11.6 puts you in the Underweight category for someone 6'6".
To reach the lower boundary of the healthy range (160 lbs), you would need to gain approximately 60 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 6'6" and 100 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
For someone 6'6", the healthy weight range based on BMI is 160 to 215 lbs. At 160 lbs, BMI is 18.5 (lower boundary of healthy). At 215 lbs, BMI is 24.9 (upper boundary of healthy). Below 160 lbs is underweight; above 215 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 11.6 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 11.6 at 6'6" places you in the Underweight 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 160 to 215 lbs for someone 6'6".
At 6'6", a weight of 100 lbs gives a BMI of 11.6, which is in the Underweight category. The healthy weight range for 6'6" is 160 to 215 lbs. This is below the healthy range. Keep in mind BMI does not account for muscle mass or body composition.
To reach low end (160 lbs)
60 lbs to gain
To reach high end (215 lbs)
115 lbs to gain
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