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At 6'6" and 150 lbs, your BMI is 17.3, placing you in the Underweight category. A BMI of 17.3 falls in the underweight range (below 18.5). This may indicate insufficient body mass for your height. Consulting a healthcare provider is recommended.
17.3
BMI
Underweight
Category
160-215
Healthy range (lbs)
+10 lbs
To healthy low
BMI 17.3: 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 17.3 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 10 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 150 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
A BMI of 17.3 falls in the Underweight range. A BMI of 17.3 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 10 lbs to reach the low end of the healthy range. The healthy BMI range (18.5 to 24.9) corresponds to 160 to 215 lbs for someone 6'6". 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 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.
To reach low end (160 lbs)
10 lbs to gain
To reach high end (215 lbs)
65 lbs to gain
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