Health & Fitness
BMI: 5'9", 120 lbs = 17.7
Body Mass Index for someone 5'9" (175 cm) tall weighing 120 lbs (54.4 kg).
Result: BMI of 17.7 = Underweight. Healthy weight range for 5'9": 125–169 lbs.
Your BMI
24.4
Healthy weight
BMI 18.5–24.9. Associated with the lowest health risk for most adults.
Healthy weight range
Healthy range for your height
129–174lb
Ideal weight (Devine formula)
161lb
BMI for 5'9" at 120 lbs
BMI below 18.5. May indicate undernutrition. Consult a healthcare provider.
Use the calculator above to adjust weight or height and see how BMI changes. To improve BMI sustainably, focus on small calorie deficits (~500/day) combined with strength training — fast crash diets lose muscle along with fat and tend to rebound.
Frequently Asked Questions
What is the BMI for 5'9" 120 lbs?▾
A person who is 5'9" (69", or 175 cm) tall and weighs 120 lbs (54.4 kg) has a BMI of 17.7, which is classified as "Underweight". The healthy BMI range for adults is 18.5 to 24.9.
What is a healthy weight for 5'9"?▾
For someone 5'9" tall, a healthy weight (BMI 18.5–24.9) ranges from 125 to 169 lbs. Below that range is considered underweight; above it is overweight.
How is BMI calculated?▾
BMI = weight (kg) ÷ height² (m). For imperial: BMI = (weight in lbs × 703) ÷ (height in inches)². It's a screening tool, not a diagnosis — muscular people may score "overweight" without health risk.
Is BMI accurate for athletes or muscular people?▾
Not really. BMI doesn't distinguish muscle from fat. A 6' bodybuilder at 220 lbs has a BMI of 29.8 ("overweight") despite very low body fat. For a more accurate health picture, combine BMI with waist-to-height ratio and body fat percentage.
How much should I weigh at 5'9"?▾
It depends on your build, sex, age, and goals. A common reference is the Devine formula (1974), which gives an ideal weight of about varies lbs for men of this height (women are typically 4-5 lbs less). The healthy BMI range above (125–169 lbs) is wider and arguably more practical.