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At 6'4" and 140 lbs, your BMI is 17, placing you in the Underweight category. A BMI of 17 falls in the underweight range (below 18.5). This may indicate insufficient body mass for your height. Consulting a healthcare provider is recommended.
17
BMI
Underweight
Category
152-205
Healthy range (lbs)
+12 lbs
To healthy low
BMI 17: 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 17 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 12 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 140 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
For someone 6'4", the healthy weight range based on BMI is 152 to 205 lbs. At 152 lbs, BMI is 18.5 (lower boundary of healthy). At 205 lbs, BMI is 24.9 (upper boundary of healthy). Below 152 lbs is underweight; above 205 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 17 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 17 at 6'4" 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 152 to 205 lbs for someone 6'4".
At 6'4", a weight of 140 lbs gives a BMI of 17, which is in the Underweight category. The healthy weight range for 6'4" is 152 to 205 lbs. This is below the healthy range. Keep in mind BMI does not account for muscle mass or body composition.
To reach low end (152 lbs)
12 lbs to gain
To reach high end (205 lbs)
65 lbs to gain
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