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At 5'11" and 100 lbs, your BMI is 13.9, placing you in the Underweight category. A BMI of 13.9 falls in the underweight range (below 18.5). This may indicate insufficient body mass for your height. Consulting a healthcare provider is recommended.
13.9
BMI
Underweight
Category
133-179
Healthy range (lbs)
+33 lbs
To healthy low
BMI 13.9: Underweight
| BMI | Category | Weight (lbs) | Your Status |
|---|---|---|---|
| Below 18.5 | Underweight | Below 133 lbs | You are here |
| 18.5 to 24.9 | Normal | 133 to 179 lbs | Goal range |
| 25.0 to 29.9 | Overweight | 180 to 215 lbs | - |
| 30.0+ | Obese | Above 215 lbs | - |
Your BMI of 13.9 puts you in the Underweight category for someone 5'11".
To reach the lower boundary of the healthy range (133 lbs), you would need to gain approximately 33 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 5'11" and 100 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
A BMI of 13.9 at 5'11" 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 133 to 179 lbs for someone 5'11".
At 5'11", a weight of 100 lbs gives a BMI of 13.9, which is in the Underweight category. The healthy weight range for 5'11" is 133 to 179 lbs. This is below the healthy range. Keep in mind BMI does not account for muscle mass or body composition.
A healthy weight for someone 5'11" is between 133 and 179 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 13.9 falls in the Underweight range. A BMI of 13.9 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.
To reach low end (133 lbs)
33 lbs to gain
To reach high end (179 lbs)
79 lbs to gain
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