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At 5'9" and 120 lbs, your BMI is 17.7, placing you in the Underweight category. A BMI of 17.7 falls in the underweight range (below 18.5). This may indicate insufficient body mass for your height. Consulting a healthcare provider is recommended.
17.7
BMI
Underweight
Category
125-169
Healthy range (lbs)
+5 lbs
To healthy low
BMI 17.7: Underweight
| BMI | Category | Weight (lbs) | Your Status |
|---|---|---|---|
| Below 18.5 | Underweight | Below 125 lbs | You are here |
| 18.5 to 24.9 | Normal | 125 to 169 lbs | Goal range |
| 25.0 to 29.9 | Overweight | 170 to 203 lbs | - |
| 30.0+ | Obese | Above 203 lbs | - |
Your BMI of 17.7 puts you in the Underweight category for someone 5'9".
To reach the lower boundary of the healthy range (125 lbs), you would need to gain approximately 5 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 5'9" and 120 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
For someone 5'9", the healthy weight range based on BMI is 125 to 169 lbs. At 125 lbs, BMI is 18.5 (lower boundary of healthy). At 169 lbs, BMI is 24.9 (upper boundary of healthy). Below 125 lbs is underweight; above 169 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 17.7 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 17.7 at 5'9" 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 125 to 169 lbs for someone 5'9".
At 5'9", a weight of 120 lbs gives a BMI of 17.7, which is in the Underweight category. The healthy weight range for 5'9" is 125 to 169 lbs. This is below the healthy range. Keep in mind BMI does not account for muscle mass or body composition.
To reach low end (125 lbs)
5 lbs to gain
To reach high end (169 lbs)
49 lbs to gain
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